Home » Public Forums » GMCnet » Vaporlock at Last! (Monarch Pass, CO)
| Vaporlock at Last! [message #220442] |
Thu, 29 August 2013 22:51  |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
|
Senior Member |
|
|
I know I should not be celebrating vaporlock but it was good to have it happen. Keeps us humble.
I hav fuel injection so I am pretty sure it was not on the 17psi side of the pump. However the pressure dropped to 5. I believe this was because the pump was cavitating in bubbles because bubbles will compress and keep the pressure up. (I have bubbles in my oil line for my oil gauge). Of course when the pressure drops to 5 hard telling what was happening on the high side.
It never stopped but did a lot of surging. Pulled over and cracked the gas cap. Pressure but no boiling sound but it kept venting long enough to make me believe ther might be boiling. (yes I had ethanol and don't really care) i reached under and felt the tanks. I was underwhelmed at the temperature. They were warm but it would be a stretch to call then hot. We let it sit for a few minutes and went on. Had to stop again a little later. After that I found that if I just eased up the hill in first gear at about 2400 I was ok. 2500 and it couldn't keep up. I had been running in first gear at 3100. (3.21 final drive)
Man that pass is a grind.
So there is my report. I am now one of the club,
1. Still don't care about ethanol
2. I might begin to consider the possibility of in tank pumps, maybe.
3. I am ready to consider that Fuel injection with a return can heat the gas up by the engine and then dump it back in the tanks warming the gas.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
|
|
|
|
|
|
| Re: [GMCnet] Vaporlock at Last! [message #220588 is a reply to message #220463] |
Fri, 30 August 2013 22:42  |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
|
Senior Member |
|
|
| Mr ERFisher wrote on Fri, 30 August 2013 03:21 |
On Thu, Aug 29, 2013 at 8:51 PM, George Beckman <gbeckman@pggp.com> wrote:
this seems to indicate your vapor vents were not working
- rubber lines on top of tank, crushed?
- liquid separator not working?
- canister not working
this 5/16 inch vent (in each tank, open all the time) should be able to
take care of this?
what think?
-consider an accumulator tank between the low pressure pump, and the
high pressure pump (like jimK uses)
keep us tinned-in:>)
gene
|
gas is vaporizing pretty quickly. The thing I cannot understand is how this can be happening (did again in lower elevations until I put in 18 gallons which cooled things)
Hoses are new and not pinching. I smell the canister a tiny bit when I stop... I think it is overpowered by vapor. Today the tank spit at me as I eased the cap of to put in gas. Had a hard time getting the pump to pump until some cool gas got in the tanks and then all was normal.
Guys say ethanol but as you know in CA we have nothing but Ethanol. I have driven through Redding when it was so hot you could fry an egg and no problems. I have driving up into the Sierras when it is hot hot with no problems. Suddenly in the last two days it is touchy.
Anyway, regardless, we are in Pratt, KS, at the little lake with rock piers you can camp on. Like waking up on a boat without the bobbing.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
|
|
|
|
| Re: [GMCnet] Vaporlock at Last! [message #220601 is a reply to message #220588] |
Sat, 31 August 2013 00:33 |
gcbgold
Messages: 60
Registered: August 2012
Karma: -1
|
Member |
|
|
George,
I had problems whenever I removed the gas cap it wanted to blow gas all over me. I had to be really careful and very slowly remove the cap. It gets really hot here in Red Bluff. I had installed all new gas lines, carbon canister and fuel vapor separator a couple years earlier. For some reason I decided to take the new fuel vapor separator off and reinstall the original one. Even here when temps are over a 100 degrees I don't have any problem with gas blowing out when I remove the cap in hot weather anymore. In my case it was a defective fuel vapor.
Gary Bovee
Red Bluff, CA
1978 GMC Royale
Free "Internet Idiot's Guide Finding GMC MotorHome Information"
www.gmcidiotsguide.com
On Aug 30, 2013, at 8:42 PM, George Beckman <gbeckman@pggp.com> wrote:
>
>
> Mr ERFisher wrote on Fri, 30 August 2013 03:21
>> On Thu, Aug 29, 2013 at 8:51 PM, George Beckman <gbeckman@pggp.com> wrote:
>>
>>
>>
>> this seems to indicate your vapor vents were not working
>> - rubber lines on top of tank, crushed?
>> - liquid separator not working?
>> - canister not working
>>
>> this 5/16 inch vent (in each tank, open all the time) should be able to
>> take care of this?
>> what think?
>>
>> -consider an accumulator tank between the low pressure pump, and the
>> high pressure pump (like jimK uses)
>>
>> keep us tinned-in:>)
>>
>> gene
>
> gas is vaporizing pretty quickly. The thing I cannot understand is how this can be happening (did again in lower elevations until I put in 18 gallons which cooled things)
>
> Hoses are new and not pinching. I smell the canister a tiny bit when I stop... I think it is overpowered by vapor. Today the tank spit at me as I eased the cap of to put in gas. Had a hard time getting the pump to pump until some cool gas got in the tanks and then all was normal.
>
> Guys say ethanol but as you know in CA we have nothing but Ethanol. I have driven through Redding when it was so hot you could fry an egg and no problems. I have driving up into the Sierras when it is hot hot with no problems. Suddenly in the last two days it is touchy.
>
> Anyway, regardless, we are in Pratt, KS, at the little lake with rock piers you can camp on. Like waking up on a boat without the bobbing.
>
>
>
> --
> '74 Eleganza, SE, Howell + EBL
> Best Wishes,
> George
> _______________________________________________
> 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
|
|
|
|
| Re: [GMCnet] Vaporlock at Last! [message #220604 is a reply to message #220588] |
Sat, 31 August 2013 02:06 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
You can choose to ignore the ethanol problem but it is the major source of the issue.
You can try to compare California gasoline to what you have in Colorado but it is different. In 2007, amendments to the CaRFG3 regulations set the RVP flat limit to 7.0 psi for oxygenated fuels and a flat limit RVP of 6.9 psi for non-oxygenated fuels.
This is much stricter than any other state.
If you have questions regarding the RVP requirements in California, please contact the California Air Resources Board at (916) 322-6020.
In Colorado the RVP for non-ethanol diluted fuel is 9.0 or 7.8 depending on the county where it was purchased. Add to that an additional 1.0 waiver for the added ethanol and you are at 10.0.
Now add to that some heat and high altitude and it is easy to see why your fuel is boiling. So you can choose ignore the ethanol problem but it is still there whether you choose ignore it or not.
http://www.arb.ca.gov/fuels/gasoline/rvp/rvp.htm
http://www.epa.gov/otaq/fuels/gasolinefuels/volatility/standards.htm
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
|
|
|
|
| Re: [GMCnet] Vaporlock at Last! [message #220605 is a reply to message #220601] |
Sat, 31 August 2013 02:05 |
 |
ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
|
Senior Member |
|
|
Once I had Jim K redo my fuel lines, he found the vapor separator (I think) to. E defective and replaced it. I've never had blowback from the gas tanks when filling, even in Baker going up the grade to Vegas.
Larry Davick
On Aug 30, 2013, at 10:33 PM, Gary Bovee <gcbgold@gmail.com> wrote:
> George,
>
> I had problems whenever I removed the gas cap it wanted to blow gas all over me. I had to be really careful and very slowly remove the cap. It gets really hot here in Red Bluff. I had installed all new gas lines, carbon canister and fuel vapor separator a couple years earlier. For some reason I decided to take the new fuel vapor separator off and reinstall the original one. Even here when temps are over a 100 degrees I don't have any problem with gas blowing out when I remove the cap in hot weather anymore. In my case it was a defective fuel vapor.
>
> Gary Bovee
> Red Bluff, CA
> 1978 GMC Royale
> Free "Internet Idiot's Guide Finding GMC MotorHome Information"
> www.gmcidiotsguide.com
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
|
|
|
|
|
|
| Re: [GMCnet] Vaporlock at Last! [message #220629 is a reply to message #220588] |
Sat, 31 August 2013 10:19 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
|
Senior Member |
|
|
George,
My guess is that you are getting gas with a different formulation than what you get in CA. About 25 years ago, I had severe vapor lock issues while driving a Dodge SOB through Oklahoma and Missouri. I even changed out the fuel pump in the Gateway Arch parking lot. Nothing helped. Once I got NE farther, the problem went away. Had the same problem on the way home in the same area. Once I got into New Mexico (where it was hotter and hillier) it fixed it's self again.
The ethanol IS part of the problem, but winter/summer, or regional gasoline formulations seem to be an even bigger issue. I have very little vapor lock problems even in AZ, where all our gas is 'oxygenated', now that I have doneall sorts of things to combat it, but I had NO problems with non ethanol gas I got in New Mexico, even with the electric fuel pump off.
My '75 coach has a Q-jet and a mechanical fuel pump/auxiliary electric pump by the tanks.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
|
|
|
|
| Re: [GMCnet] Vaporlock at Last! [message #220703 is a reply to message #220601] |
Sat, 31 August 2013 19:21 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
|
Senior Member |
|
|
| gcbgold wrote on Fri, 30 August 2013 22:33 |
George,
I had problems whenever I removed the gas cap it wanted to blow gas all over me. I had to be really careful and very slowly remove the cap. It gets really hot here in Red Bluff. I had installed all new gas lines, carbon canister and fuel vapor separator a couple years earlier. For some reason I decided to take the new fuel vapor separator off and reinstall the original one. Even here when temps are over a 100 degrees I don't have any problem with gas blowing out when I remove the cap in hot weather anymore. In my case it was a defective fuel vapor.
Gary Bovee
Red Bluff, CA
1978 GMC Royale
Free "Internet Idiot's Guide Finding GMC MotorHome Information"
www.gmcidiotsguide.com
|
Gary and all,
Thanks for the input. Gary, I know the heat you are talking about. Redding is a good choice for hot days as well.
I will re check the separator and canister including the canister carb/TBI hose.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
|
|
|
|
| Re: Vaporlock at Last! [message #220734 is a reply to message #220442] |
Sun, 01 September 2013 08:48 |
winter
Messages: 247
Registered: September 2007
Location: MPLS MN
Karma: 0
|
Senior Member |
|
|
Is there a procedure for checking the canister, seperator, vent lines?
Just blow through to check for resistance?
Jerrod Winter
1977 Palm Beach
Green Jelly Bean
Twin Cities, Minnesota
|
|
|
|
Goto Forum:
Current Time: Tue Sep 24 00:25:47 CDT 2024
Total time taken to generate the page: 0.00644 seconds
|
GMCforum
Search
Help
Register
Login
Home
