Home » Public Forums » GMCnet » Was that vapor lock?
| Was that vapor lock? [message #204487] |
Fri, 12 April 2013 19:29  |
DrPepper
Messages: 80
Registered: February 2013
Location: Goose Creek,SC
Karma: 0
|
Member |
|
|
So this is the second time out, fuel leak repaired. About 30 miles out, there was a wreck on the road so everyone was going about 3 miles a hour.
Then all of a sudden the engine staled. Pulled off the road and started the engine back up. Pulled back out, and again it stalled. During this time the electric fuel pump was making a lot of noise like the tanks where empty. I would estimate road temp at maybe 90dg. When it was stalling, if I pumped the gas peddle I could stop the stall, some times. Once I got some speed up, the fuel pump sounded better, and problem went away.
This happened two more times during the trip to the state park, where I am typing this. Ever time it was when I slowed down at a light or to turn.
Once I got to the park where the road are shaded, I was able to go slow and had no problems.
Phillip Udel - I Own a 1975 Avion
|
|
|
|
| Re: [GMCnet] Was that vapor lock? [message #204490 is a reply to message #204487] |
Fri, 12 April 2013 20:05  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
|
|
Vapor lock you got.
--johnny
'76 23' transmode norris
'76 palm beach
From: Phillip Udel <admin@salemcorp.com>
To: gmclist@temp.gmcnet.org
Sent: Friday, April 12, 2013 8:29 PM
Subject: [GMCnet] Was that vapor lock?
So this is the second time out, fuel leak repaired. About 30 miles out, there was a wreck on the road so everyone was going about 3 miles a hour.
Then all of a sudden the engine staled. Pulled off the road and started the engine back up. Pulled back out, and again it stalled. During this time the electric fuel pump was making a lot of noise like the tanks where empty. I would estimate road temp at maybe 90dg. When it was stalling, if I pumped the gas peddle I could stop the stall, some times. Once I got some speed up, the fuel pump sounded better, and problem went away.
This happened two more times during the trip to the state park, where I am typing this. Ever time it was when I slowed down at a light or to turn.
Once I got to the park where the road are shaded, I was able to go slow and had no problems.
--
Phillip Udel - http://www.gmcfabrication.com/ I Own a 1975 Avion, Still removing the Mothballs after sitting in storage for 10+ years
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
|
|
|
|
| Re: [GMCnet] Was that vapor lock? [message #204493 is a reply to message #204490] |
Fri, 12 April 2013 20:13 |
kelvin
Messages: 608
Registered: February 2004
Location: Eugene, OR
Karma: 0
|
Senior Member |
|
|
That's the only time I ever experience it. +85° and creeping thru
traffic stopping at traffic signals. I don't think that carb likes being
hot. It's been MUCH better since blocking the exhaust crossover years
ago. Wouldn't even need to be that hot outside with a functional
crossover.
Kelvin
'73 23' in Eugene, OR
On 4/12/2013 6:05 PM, Johnny Bridges wrote:
> Vapor lock you got.
>
> --johnny
> '76 23' transmode norris
> '76 palm beach
>
>
> From: Phillip Udel <admin@salemcorp.com>
> To: gmclist@temp.gmcnet.org
> Sent: Friday, April 12, 2013 8:29 PM
> Subject: [GMCnet] Was that vapor lock?
>
>
>
>
> So this is the second time out, fuel leak repaired. About 30 miles out, there was a wreck on the road so everyone was going about 3 miles a hour.
> Then all of a sudden the engine staled. Pulled off the road and started the engine back up. Pulled back out, and again it stalled. During this time the electric fuel pump was making a lot of noise like the tanks where empty. I would estimate road temp at maybe 90dg. When it was stalling, if I pumped the gas peddle I could stop the stall, some times. Once I got some speed up, the fuel pump sounded better, and problem went away.
> This happened two more times during the trip to the state park, where I am typing this. Ever time it was when I slowed down at a light or to turn.
> Once I got to the park where the road are shaded, I was able to go slow and had no problems.
>
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: Was that vapor lock? [message #204496 is a reply to message #204487] |
Fri, 12 April 2013 20:28 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
Sure sounds like it.
Now is the time of year when winter mix fuel is still sold and in the distribution system. EPA vapor pressure requirements kick in on May 1st. After May 1st EPA vapor pressure requirements change to summer values. If you are buying ethanol mixed fuel there is an additional 1 psi waiver allowed to the normal EPA requirements.
So you probably have winter mixed fuel with a lot of butane and alcohol in it.
On the way back from the Shawnee rally last year one of the GMCers got burned by that same problem. He ended up waiting until late an night to drive and burn off that bad batch of fuel.
If you are not going to need it, wait until after May 1st to fill up. The rule is for all fuel sold at retail. You could still get some bad fuel during the first week or so of May at a few stations.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
|
|
|
|
| Re: [GMCnet] Was that vapor lock? [message #204524 is a reply to message #204496] |
Sat, 13 April 2013 08:10 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
|
Senior Member |
|
|
As one of 3 coaches that got a load of winter gas at a Kansas Turnpike rest stop in 85+ temps on the way back from Shawnee vapor lock is real. The vapor pressure of the winter gas can be an issue. It made no difference wether you had fuel injection, we had multipart and TBI or a carb. We had all three types of induction. The fuel was boiling in the tanks, you could hear it standing next to the coach and it would spew out the fill tube when you opened the cap. We pulled off the I44 just into Missouri and waited for dark and temp to drop. We drove another 4 hours getting to our KOA after midnight. We stopped twice to add cold fuel to the tanks. The next day the temps were more moderate and we did not have any more problems.
JR Wright
78 Buskirk Stretch
Michigan
On Apr 12, 2013, at 9:28 PM, Ken Burton <n9cv@comcast.net> wrote:
>
>
> Sure sounds like it.
>
> Now is the time of year when winter mix fuel is still sold and in the distribution system. EPA vapor pressure requirements kick in on May 1st. After May 1st EPA vapor pressure requirements change to summer values. If you are buying ethanol mixed fuel there is an additional 1 psi waiver allowed to the normal EPA requirements.
>
> So you probably have winter mixed fuel with a lot of butane and alcohol in it.
>
> On the way back from the Shawnee rally last year one of the GMCers got burned by that same problem. He ended up waiting until late an night to drive and burn off that bad batch of fuel.
>
> If you are not going to need it, wait until after May 1st to fill up. The rule is for all fuel sold at retail. You could still get some bad fuel during the first week or so of May at a few stations.
>
>
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
|
|
|
|
| Re: Was that vapor lock? [message #204533 is a reply to message #204487] |
Sat, 13 April 2013 09:57 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
|
Senior Member |
|
|
The only time my coach (403, Holley carb, stock manifold - not sure if it's blocked or not) vapor locked was in stop-and-go traffic in an Arizona summer afternoon (ambient temperature well over 100). The engine just quit halfway around a corner after sitting at a stop light waiting to turn left. Fortunately, I had enough momentum to coast into a parking lot, and realized I hadn't turned on the electric fuel pump. Click, vroooom, no more problems (ever). I keep it on any time vapor lock is even a remote possibility now. I've decided I'll leave it in line when I install my fuel injection system, too.
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
|
|
|
|
| Re: [GMCnet] Was that vapor lock? [message #204535 is a reply to message #204524] |
Sat, 13 April 2013 10:12 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
|
Senior Member |
|
|
JR
do you know the condition of your vapor recovery vents?
the liquid separator and the canister?
most of the old-guard that have contacted me over the last year
have removed the exit connection from the separator
and
replaces the liquid separator.
this vent should let the tanks boil
gene
On Sat, Apr 13, 2013 at 6:10 AM, John Wright <powerjon@chartermi.net> wrote:
> As one of 3 coaches that got a load of winter gas at a Kansas Turnpike
> rest stop in 85+ temps on the way back from Shawnee vapor lock is real.
> The vapor pressure of the winter gas can be an issue. It made no
> difference wether you had fuel injection, we had multipart and TBI or a
> carb. We had all three types of induction. The fuel was boiling in the
> tanks, you could hear it standing next to the coach and it would spew out
> the fill tube when you opened the cap. We pulled off the I44 just into
> Missouri and waited for dark and temp to drop. We drove another 4 hours
> getting to our KOA after midnight. We stopped twice to add cold fuel to
> the tanks. The next day the temps were more moderate and we did not have
> any more problems.
>
> JR Wright
> 78 Buskirk Stretch
> Michigan
>
> On Apr 12, 2013, at 9:28 PM, Ken Burton <n9cv@comcast.net> wrote:
>
> >
> >
> > Sure sounds like it.
> >
> > Now is the time of year when winter mix fuel is still sold and in the
> distribution system. EPA vapor pressure requirements kick in on May 1st.
> After May 1st EPA vapor pressure requirements change to summer values. If
> you are buying ethanol mixed fuel there is an additional 1 psi waiver
> allowed to the normal EPA requirements.
> >
> > So you probably have winter mixed fuel with a lot of butane and alcohol
> in it.
> >
> > On the way back from the Shawnee rally last year one of the GMCers got
> burned by that same problem. He ended up waiting until late an night to
> drive and burn off that bad batch of fuel.
> >
> > If you are not going to need it, wait until after May 1st to fill up.
> The rule is for all fuel sold at retail. You could still get some bad
> fuel during the first week or so of May at a few stations.
> >
> >
> > --
> > Ken Burton - N9KB
> > 76 Palm Beach
> > Hebron, Indiana
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: Was that vapor lock? [message #204541 is a reply to message #204487] |
Sat, 13 April 2013 11:57 |
Michael Morton
Messages: 21
Registered: July 2004
Karma: 0
|
Junior Member |
|
|
Yep sounds like vapor lock. I wrote on here, about a year ago, how I felt that I had cured my vapor lock problems with a simple mod that cost less than 25 dollars. Since then I have made several trips including trips to Florida in hot weather and have had no indication of vapor lock. Although I haven't been in extremely hot weather, ie above 100 or so, the engine hasn't died, no stumbling, no hesitation or anything. When I first told about the mod and how I felt it had cured my vapor lock problem, I was blasted by some of the people on this forum. I was told it would never work, it was too complicated, it would need a calibrated orifice, the carb would starve for fuel, etc. Now, after more than a year of driving my coach, I am more convinced that it has cured my vapor lock problems. I had previously installed an electric fuel pump to fight the vapor lock, it didn't cure it and now I just use the electric fuel pump to prime or fill the carb when it has been sitting for a while to make it start easier. If anyone is interested, send me a private email and I will send what I did with pictures. I just don't feel like getting ridiculed on here again, and I don't feel like getting in pissing match with some of the experts on here.
Mike Morton
|
|
|
|
| Re: [GMCnet] Was that vapor lock? [message #204543 is a reply to message #204535] |
Sat, 13 April 2013 12:31 |
DrPepper
Messages: 80
Registered: February 2013
Location: Goose Creek,SC
Karma: 0
|
Member |
|
|
I will need to check the when I get back to the shop
| Mr ERFisher wrote on Sat, 13 April 2013 11:12 |
JR
do you know the condition of your vapor recovery vents?
the liquid separator and the canister?
most of the old-guard that have contacted me over the last year
have removed the exit connection from the separator
and
replaces the liquid separator.
this vent should let the tanks boil
gene
On Sat, Apr 13, 2013 at 6:10 AM, John Wright <powerjon@chartermi.net> wrote:
> As one of 3 coaches that got a load of winter gas at a Kansas Turnpike
> rest stop in 85+ temps on the way back from Shawnee vapor lock is real.
> The vapor pressure of the winter gas can be an issue. It made no
> difference wether you had fuel injection, we had multipart and TBI or a
> carb. We had all three types of induction. The fuel was boiling in the
> tanks, you could hear it standing next to the coach and it would spew out
> the fill tube when you opened the cap. We pulled off the I44 just into
> Missouri and waited for dark and temp to drop. We drove another 4 hours
> getting to our KOA after midnight. We stopped twice to add cold fuel to
> the tanks. The next day the temps were more moderate and we did not have
> any more problems.
>
> JR Wright
> 78 Buskirk Stretch
> Michigan
>
> On Apr 12, 2013, at 9:28 PM, Ken Burton <n9cv@comcast.net> wrote:
>
> >
> >
> > Sure sounds like it.
> >
> > Now is the time of year when winter mix fuel is still sold and in the
> distribution system. EPA vapor pressure requirements kick in on May 1st.
> After May 1st EPA vapor pressure requirements change to summer values. If
> you are buying ethanol mixed fuel there is an additional 1 psi waiver
> allowed to the normal EPA requirements.
> >
> > So you probably have winter mixed fuel with a lot of butane and alcohol
> in it.
> >
> > On the way back from the Shawnee rally last year one of the GMCers got
> burned by that same problem. He ended up waiting until late an night to
> drive and burn off that bad batch of fuel.
> >
> > If you are not going to need it, wait until after May 1st to fill up.
> The rule is for all fuel sold at retail. You could still get some bad
> fuel during the first week or so of May at a few stations.
> >
> >
> > --
> > Ken Burton - N9KB
> > 76 Palm Beach
> > Hebron, Indiana
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
Phillip Udel - I Own a 1975 Avion
|
|
|
|
|
|
|
|
| Re: Was that vapor lock? [message #204548 is a reply to message #204487] |
Sat, 13 April 2013 12:44 |
DrPepper
Messages: 80
Registered: February 2013
Location: Goose Creek,SC
Karma: 0
|
Member |
|
|
Since I need to drop the tanks to replace the fuel line I thought I would do internal fuel pumps. That looked like a fun project lol...
I did not hear tanks boiling, if it happens again on the way home, I will remove the fill cap and see if I feel pressure release. I am note sure what I can check on he canister in the middle of no where with minimal tools.
The biggest symptoms was the change in sound of the electric fuel pump, as if it had run dry.
I have not ruled out a bad fuel pump or collapsed fuel line on the suction side.
Phillip Udel - I Own a 1975 Avion
|
|
|
|
| Re: Was that vapor lock? [message #204573 is a reply to message #204541] |
Sat, 13 April 2013 18:39 |
 |
Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
|
Senior Member |
|
|
| Michael Morton wrote on Sat, 13 April 2013 12:57 |
Yep sounds like vapor lock. I wrote on here, about a year ago, how I felt that I had cured my vapor lock problems with a simple mod that cost less than 25 dollars. Since then I have made several trips including trips to Florida in hot weather and have had no indication of vapor lock. Although I haven't been in extremely hot weather, ie above 100 or so, the engine hasn't died, no stumbling, no hesitation or anything. When I first told about the mod and how I felt it had cured my vapor lock problem, I was blasted by some of the people on this forum. I was told it would never work, it was too complicated, it would need a calibrated orifice, the carb would starve for fuel, etc. Now, after more than a year of driving my coach, I am more convinced that it has cured my vapor lock problems. I had previously installed an electric fuel pump to fight the vapor lock, it didn't cure it and now I just use the electric fuel pump to prime or fill the carb when it has been sitting for a while to make it start easier. If anyone is interested, send me a private email and I will send what I did with pictures. I just don't feel like getting ridiculed on here again, and I don't feel like getting in pissing match with some of the experts on here.
Mike Morton
|
Micheal,
You can feel like you were mistreated if you want to, but I just re-read the thread. There were questioned asked, but there always are. And, Don't be offended by JimB, he says what he thinks and at least he says it clearly.
I remember reading that when you wrote it and the only thing I was impressed with is that you have someone that will light a TIG for less than 50$ (the local minimum here).
The other thing I wondered at the time was why you didn't T into the fill vent that is right there. That is what I had been considering. But I, like others would have just used the Toro w/A/C fuel pump.
We don't go where it is hot enough to have much of a vapor lock issue. It sure wasn't any problem in Dothan.....
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
|
|
|
|
| Re: [GMCnet] Was that vapor lock? [message #204585 is a reply to message #204524] |
Sat, 13 April 2013 19:40 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
JR's was the problem I was referring to in my original posting. I did not want to mention his name without his permission. As you will notice he did not have the problem again after burning off that bad (winter) load of gas in cooler temperatures.
| powerjon wrote on Sat, 13 April 2013 08:10 |
As one of 3 coaches that got a load of winter gas at a Kansas Turnpike rest stop in 85+ temps on the way back from Shawnee vapor lock is real. The vapor pressure of the winter gas can be an issue. It made no difference wether you had fuel injection, we had multipart and TBI or a carb. We had all three types of induction. The fuel was boiling in the tanks, you could hear it standing next to the coach and it would spew out the fill tube when you opened the cap. We pulled off the I44 just into Missouri and waited for dark and temp to drop. We drove another 4 hours getting to our KOA after midnight. We stopped twice to add cold fuel to the tanks. The next day the temps were more moderate and we did not have any more problems.
JR Wright
78 Buskirk Stretch
Michigan
On Apr 12, 2013, at 9:28 PM, Ken Burton <n9cv@comcast.net> wrote:
>
>
> Sure sounds like it.
>
> Now is the time of year when winter mix fuel is still sold and in the distribution system. EPA vapor pressure requirements kick in on May 1st. After May 1st EPA vapor pressure requirements change to summer values. If you are buying ethanol mixed fuel there is an additional 1 psi waiver allowed to the normal EPA requirements.
>
> So you probably have winter mixed fuel with a lot of butane and alcohol in it.
>
> On the way back from the Shawnee rally last year one of the GMCers got burned by that same problem. He ended up waiting until late an night to drive and burn off that bad batch of fuel.
>
> If you are not going to need it, wait until after May 1st to fill up. The rule is for all fuel sold at retail. You could still get some bad fuel during the first week or so of May at a few stations.
>
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
|
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
|
|
|
|
| Re: Was that vapor lock? [message #204618 is a reply to message #204573] |
Sun, 14 April 2013 08:39 |
Michael Morton
Messages: 21
Registered: July 2004
Karma: 0
|
Junior Member |
|
|
Matt,
I did try using a T and routing the return into the fuel vent line. It worked good for returning the fuel to the tank. But, with the vent line full of fuel it wouldn't vent when I tried to fill it up with gas. After what seemed like 20 min and only getting it to take 10 gallons I knew that it wouldn't work like that.
As far as the welding, I have 3 different TIG welders that I use, good, better and best. If it is for one of the airplanes that I am restoring, I only use the best. For this I used the good TIG welder, his shop is adjacent to the airport where my hanger is and he was a customer of mine at a Harley repair shop I sold a couple years ago. I still maintain bikes for several of my former customers and his is one of them. Little jobs like this he usually does for free, it just costs me a beer the next time I see him out. When you have restored, raced and flown as many things as I have over the years you build a network of friends.
Mike
|
|
|
|
| Re: [GMCnet] Was that vapor lock? [message #204627 is a reply to message #204533] |
Sun, 14 April 2013 09:17 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
|
|
Well, I have an in-line pump I used on the Toadstone until I could get the injector rebuilt. It was marked 'Diesel' looked just like the gasoline onefor $5 more at O'Rielly's. (For those unfamiliar withthe Bosch VE series pump, leakage at the front seal will make the pump lose its prime leading to hard starting. Quick and dirty repair is an electirc [pump to spin for a bit before starting to reprime it.. Once running, no problems.) I am minded t fit it to my coach in the rear in front f the valve to use as a boost in hot traffic situations. I can't find a pressure spec on it, but it can't be very great, Much of my use is in the Soputheast in the summer, at which point the coach dislikes stop and go traffic intensely.
--johnny
'76 23' transmode norris
'76 palm beach
From: Mark <mark@habcycles.com>
To: gmclist@temp.gmcnet.org
Sent: Saturday, April 13, 2013 10:57 AM
Subject: Re: [GMCnet] Was that vapor lock?
The only time my coach (403, Holley carb, stock manifold - not sure if it's blocked or not) vapor locked was in stop-and-go traffic in an Arizona summer afternoon (ambient temperature well over 100). The engine just quit halfway around a corner after sitting at a stop light waiting to turn left. Fortunately, I had enough momentum to coast into a parking lot, and realized I hadn't turned on the electric fuel pump. Click, vroooom, no more problems (ever). I keep it on any time vapor lock is even a remote possibility now. I've decided I'll leave it in line when I install my fuel injection system, too.
--
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
|
|
|
|
|
|
| Re: [GMCnet] Was that vapor lock? [message #204760 is a reply to message #204730] |
Mon, 15 April 2013 18:12 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
|
Senior Member |
|
|
Phil,
If you're going to replace your old electric fuel pump I would suggest a Carter P4070.
http://www.jegs.com/i/Carter/180/P4070/10002/-1?parentProductId=748050#moreDetails
I presently use this exact pump as the pre-pump to my high pressure fuel pump. I run multipart fuel injection. My high pressure pump is the same pump that the 450 SEL V8 Mercedes Benz uses. It can put up almost 75 psig, but with the fuel regulator my system runs at about 52 psig.
The problem that our group had coming back from Shawnee is that we fueled up with winter gas that has a lower vapor pressure for COLD weather. It was 85+ degF with a sun beating down on the turnpike. The primary pump could not get a constant suction of liquid out of the fuel tanks as the gas was literary boiling in the tanks and suction line. When the sun went down and the ambient temp went down to the 60's we were able to continue our trip.
One of the comments at the Fuel Injection Seminar at the GMCMI was that the mechanical fuel pump was a major heat inducer to the fuel passing thru it. It was said that taking the Mechanical fuel pump out of the fuel circuit and going all electric is beneficial to reducing vapor lock. Not my statement, just what was discussed.
Now for a personal experience on all electric fuel system. I have been running them on my coaches since 2003 with great results. One suggestion I would have is to run the fuel line up the back of the engine compartment and across the top of the motor to the carb. You get rid of almost 10 feet of fuel line that you have to pump thru and add heat to the fuel. Most if not all of the MPFI and TBI units already to this shorting the fuel line length.
JR Wright
78 Buskirk Stretch
Michigan
On Apr 15, 2013, at 12:00 PM, Phillip Udel <admin@salemcorp.com> wrote:
>
>
> Just a few more thoughts.
> I am going to replace my tired old fuel pump (Professional Products 10700) with a new one. Any Subsections? I was thing about this one.
> http://www.amazon.com/Mr-Gasket-42S-Electric-Fuel/dp/B000BWE4RC
>
> I also thought I would try one these just before the Carb? or maybe before the Fuel Pump?
> http://www.globalindustrial.com/p/tools/vehicle-maintenance/automotive-fuel-filters/gf370-in-line-fuel-filter-with-vapor-diverter?utm_source=google_pr &utm_medium=cpc&utm_campaign=Fuel-Filters-google_pr&infoParam.campaignId=T9F&gclid=CLWR9rOEzbYCFQTonAodBxUA4g
>
> A fuel Filter with a vapor vents seems cool
>
>
> --
> Phillip Udel - www.gmcfabrication.com I Own a 1975 Avion, Still removing the Mothballs after sitting in storage for 10+ years
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
|
|
|
|
| Re: Was that vapor lock? [message #204889 is a reply to message #204487] |
Tue, 16 April 2013 22:30 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
|
Senior Member |
|
|
| DrPepper wrote on Fri, 12 April 2013 18:29 |
So this is the second time out, fuel leak repaired. About 30 miles out, there was a wreck on the road so everyone was going about 3 miles a hour.
Then all of a sudden the engine staled. Pulled off the road and started the engine back up. Pulled back out, and again it stalled. During this time the electric fuel pump was making a lot of noise like the tanks where empty. I would estimate road temp at maybe 90dg. When it was stalling, if I pumped the gas peddle I could stop the stall, some times. Once I got some speed up, the fuel pump sounded better, and problem went away.
This happened two more times during the trip to the state park, where I am typing this. Ever time it was when I slowed down at a light or to turn.
Once I got to the park where the road are shaded, I was able to go slow and had no problems.
|
One problem we have in discussing this centers around the fact that what seems like vapor lock can indeed be about 4 different things that all have the same symptoms. Then we trade cures that may not work on your coach. It can be fuel boiling in the tank, fuel that is boiling in the lines, fuel that is cavitating inside your fuel pump, fuel boiling inside the carb float bowl or any combination of these. There are very few original coaches when it comes to fuel or exhaust systems. You need to look at your coach closely and figure out what has been modified before you jump to a conclusion.
Bob de Kruyff
78 Eleganza
Chandler, AZ
|
|
|
|
| Re: [GMCnet] Was that vapor lock? [message #209403 is a reply to message #204889] |
Fri, 31 May 2013 09:48 |
Mike Kilroy
Messages: 80
Registered: July 2006
Location: Farmersville, OH (near D...
Karma: 0
|
Member |
|
|
Probably dumb thought based on cooler top of engine, but I am curious if
anyone who replaced their intake manifold with the new alum one has had
a vapor lock problem?
On 4/16/2013 11:30 PM, Bob de Kruyff wrote:
> One problem we have in discussing this centers around the fact that
> what seems like vapor lock can indeed be about 4 different things that
> all have the same symptoms. Then we trade cures that may not work on
> your coach. It can be fuel boiling in the tank, fuel that is boiling
> in the lines, fuel that is cavitating inside your fuel pump, fuel
> boiling inside the carb float bowl or any combination of these. There
> are very few original coaches when it comes to fuel or exhaust
> systems. You need to look at your coach closely and figure out what
> has been modified before you jump to a conclusion.
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Mike (AC8V) & Vickie Kilroy
'73 Canyon Land 26' sidebath
455/ceramic filled crossovers
|
|
|
|
Goto Forum:
Current Time: Fri Oct 04 08:27:46 CDT 2024
Total time taken to generate the page: 0.02231 seconds
|
GMCforum
Search
Help
Register
Login
Home
