Home » Public Forums » GMCnet » [GMCnet] How do those with a carb use they're electric fuel pump?
| [GMCnet] How do those with a carb use they're electric fuel pump? [message #296397] |
Mon, 29 February 2016 08:54  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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When I bought the GMC convertible. The PO had an electric fuel pump back at the tank switch valve as a boost pump to be used as required at times. Or just use it to fill the carb before start. There was a switch on the dash to control it. I used it to fill the carb at start. And to use it to boost the stock pump when the stock pump just couldn't seem to get enough fuel to the carb in warmer weather. ( I'm installing my EFI system that I have when we get back from Alabama. It's a time thing now. ) So now. Some use the electric pump only. Others use both as mine was. And others use only the stock mechanical pump. Looking for input.Bob Dunahugh
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| Re: [GMCnet] How do those with a carb use they're electric fuel pump? [message #296405 is a reply to message #296397] |
Mon, 29 February 2016 10:26  |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
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BobDunahugh wrote on Mon, 29 February 2016 07:54When I bought the GMC convertible. The PO had an electric fuel pump back at the tank switch valve as a boost pump to be used as required at times. Or just use it to fill the carb before start. There was a switch on the dash to control it. I used it to fill the carb at start. And to use it to boost the stock pump when the stock pump just couldn't seem to get enough fuel to the carb in warmer weather. ( I'm installing my EFI system that I have when we get back from Alabama. It's a time thing now. ) So now. Some use the electric pump only. Others use both as mine was. And others use only the stock mechanical pump. Looking for input.Bob Dunahugh
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Bob,
I use mine exactly the way you describe in the first part of your post. It is hooked to the aux tank and switched on by the tank selector switch. It has been suggested that I do away with the mechanical pump, but I kind of like the redundancy. If I DID get rid of the mechanical pump, I would probably install a second electric pump and retain the redundancy that way. I recently had a chance to look over Jerry Work's new fuel injection system and it looks like the real deal. I might eventually go that route too.
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
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| Re: [GMCnet] How do those with a carb use they're electric fuel pump? [message #296409 is a reply to message #296405] |
Mon, 29 February 2016 10:40 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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I use a mechanical pump and an auxiliary electric pump. It is a Carter 4070
with a check valve bypass line. It is plumbed in line after the selector
valve. It is preceeded by a metal cased 10 micron fuel filter. It is
powered from the selector switch circuit so that when AUX is the selected
tank, the electric pump runs. In every case that I have encountered so far,
this setup will stop vapor lock in its tracks. It also will fill the carb
after the coach sits for long periods. It works for me, and on carb
equipped coaches that I work on for others, it is what I install to upgrade
the system.
Jim Hupy
Salem, Or.
78 GMC ROYALE 403
On Feb 29, 2016 8:28 AM, "Carl Stouffer" wrote:
> BobDunahugh wrote on Mon, 29 February 2016 07:54
>> When I bought the GMC convertible. The PO had an electric fuel pump back
> at the tank switch valve as a boost pump to be used as required at
>> times. Or just use it to fill the carb before start. There was a switch
> on the dash to control it. I used it to fill the carb at start. And to use
>> it to boost the stock pump when the stock pump just couldn't seem to
> get enough fuel to the carb in warmer weather. ( I'm installing my EFI
> system
>> that I have when we get back from Alabama. It's a time thing now. ) So
> now. Some use the electric pump only. Others use both as mine was. And
>> others use only the stock mechanical pump. Looking for input.Bob Dunahugh
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> Bob,
>
> I use mine exactly the way you describe in the first part of your post.
> It is hooked to the aux tank and switched on by the tank selector switch.
> It
> has been suggested that I do away with the mechanical pump, but I kind of
> like the redundancy. If I DID get rid of the mechanical pump, I would
> probably install a second electric pump and retain the redundancy that
> way. I recently had a chance to look over Jerry Work's new fuel injection
> system and it looks like the real deal. I might eventually go that route
> too.
> --
> Carl Stouffer
> '75 ex Palm Beach
> Tucson, AZ.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| Re: [GMCnet] How do those with a carb use they're electric fuel pump? [message #296413 is a reply to message #296397] |
Mon, 29 February 2016 12:50 |
appie
Messages: 902
Registered: April 2013
Location: denmark
Karma: 2
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Carter electric pump in the wheelwell. No mechanical pump except as spare
Appie
eleganza 76 "Olga" now sadly sold
6 wheel discbrake
Quadrabags
Springfield stage 2 462 olds
Manny tranny
( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
Fulltiming in Europe july 2014 til july 2016
Denmark
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| Re: [GMCnet] How do those with a carb use they're electric fuel pump? [message #296416 is a reply to message #296397] |
Mon, 29 February 2016 12:57 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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I put the setup shown in because I had a bad mechanical pump, and serious vapor lock troubles - it quit in the left lane of one of the highest traveled pieces of freeway in the Eastern US at 5 in the afternoon. Since the tanks had been dropped and new hoses added, I was able to do this setup without cutting >any< of the original lines. they can be put back on the stock selector in very little time. It requires a fused 12V line which is hot with the ignition, and an automotive relay which switches the hot to the main or aux pump depending how the dash switch is set. I bagged the 'turnover' switch out of a late model Ford Ranger, I'll hook it in line with the switched 12V to preclude the pump running in an accident. These switches also activate in the event of a crash. I don't know what the required impact is, my research shows tossing a cased Wingmaster shotgun into the passenger seat such that it hits the toeboard is a sufficient shock for the switch to think you've hit something. Note that my heathen chinee genset is fed via the standard Coachman method of a tee in the line. It uses a separate pulse pump.
--johnny
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
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| Re: [GMCnet] How do those with a carb use they're electric fuel pump? [message #296419 is a reply to message #296397] |
Mon, 29 February 2016 15:37 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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I am running the same as what seemed to be set up on your old coach, and how Jim Hupy described. and it works well for me, only having to use it for vapor lock recovery twice on super hot days after I shut my coach off and let it sit for a few minutes.
I would guess that vaporlock will not be an issue for a run to Alabama in 4 weeks, so to keep it simple, just stick with the mechanical pump. Or like others and what you had before, put the electric pump on the aux fuel tank, and power it with the aux tanks switch power that switches the fuel valve. That way you have that priming feature, and you know you have gas in the carb when it cranks. Not sure if you removed those wires from the dash at all, but I thought they ran through the frame.
Just think how light and great gas mileage you will have traveling in a gutted coach... Good luck and looking forward to the reports. Need to get my office work back on track, so I can get on the road to visit my crews, and can swing by to see your projects.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: [GMCnet] How do those with a carb use they're electric fuel pump? [message #296476 is a reply to message #296413] |
Tue, 01 March 2016 01:06 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Lenze,
Being that that Carter pump is Vain driven, it is imperative that you use a
filter ahead or it to cut down on wear of the pump.
And as Jim H mentioned, you will need to install a bypass valve in case you
do not run it all the time.
On Mon, Feb 29, 2016 at 10:50 AM, lenze middelberg
wrote:
> Carter electric pump in the wheelwell. No mechanical pump except as spare
> --
> Appie
> eleganza 76 "Olga"
> 6 wheel discbrake
> Quadrabags
> Springfield stage 2 462 olds
> Manny tranny
> ( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
> Fulltiming in Europe since july 1 2014
> Denmark
>
> _______________________________________________
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] How do those with a carb use they're electric fuel p [message #296488 is a reply to message #296476] |
Tue, 01 March 2016 08:00 |
appie
Messages: 902
Registered: April 2013
Location: denmark
Karma: 2
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Senior Member |
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Right Jim. I installed a large fuelfilter/waterseperator before the pump
No dear what 'vain driven ' is though
Appie
eleganza 76 "Olga" now sadly sold
6 wheel discbrake
Quadrabags
Springfield stage 2 462 olds
Manny tranny
( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
Fulltiming in Europe july 2014 til july 2016
Denmark
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| Re: [GMCnet] How do those with a carb use they're electric fuel pump? [message #296501 is a reply to message #296476] |
Tue, 01 March 2016 10:22 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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For those of you who might be confused by Jim K's first sentence,
that's simply Jim's selection of the wrong spelling for three words
that sound identical: vein, vain, and vane with the latter being
the correct spelling for the application.
Personally, I need a steer to the portion of files where the fixed
in-line filter is installed prior to the mechanical fuel pump and
carburetor. My carb leaks at the input filter fitting and we'll
have to remove the filter and use JB-Weld to permanently repair the
leak at the input filter fitting (cross-threaded by persons unknown).
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ Since 30 November '53 ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ Member GMCMI and Classics ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
~ ~ ~ '76 ex-Palm Beach ~ ~ ~
~~ k2gkk + hotmail dot com ~~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
______________
|[ ]~~~[][ ][]\
"--OO--[]---O-"
> Date: Mon, 29 Feb 2016 23:06:57 -0800
> From: jimkanomata@gmail.com
> To: gmclist@list.gmcnet.org
> Subject: Re: [GMCnet] How do those with a carb use they're electric fuel pump?
>
> Lenze,
> Being that that Carter pump is Vain driven, it is imperative that you use a
> filter ahead or it to cut down on wear of the pump.
> And as Jim H mentioned, you will need to install a bypass valve in case you
> do not run it all the time.
>
> --
> Jim Kanomata
> Applied/GMC, Fremont,CA
> jimk@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
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| Re: [GMCnet] How do those with a carb use they're electric fuel pump? [message #296523 is a reply to message #296501] |
Tue, 01 March 2016 13:15 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Mac,
I reckon this is a better way to fix your problem:
http://quadrajetparts.com/service-fuel-inlet-thread-repair-heli-coil-installation-inlet-carburetors-p-355.html
Regards,
Rob M.
The Pedantic Mechanic
-----Original Message-----
From: D C _Mac_ Macdonald
For those of you who might be confused by Jim K's first sentence,
that's simply Jim's selection of the wrong spelling for three words
that sound identical: vein, vain, and vane with the latter being
the correct spelling for the application.
Personally, I need a steer to the portion of files where the fixed
in-line filter is installed prior to the mechanical fuel pump and
carburetor. My carb leaks at the input filter fitting and we'll
have to remove the filter and use JB-Weld to permanently repair the
leak at the input filter fitting (cross-threaded by persons unknown).
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
_______________________________________________
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Unsubscribe or Change List Options:
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] How do those with a carb use they're electric fuel pump? [message #297731 is a reply to message #296397] |
Sun, 20 March 2016 14:06 |
<rallymaster
Messages: 361
Registered: May 2014
Karma: 2
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Senior Member |
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Jim, how long does it take to start your coach after a couple of weeks
sitting, if you don't use the elec. fuel pump? Just wondering what's
typical. And how long does it take to start using the elec pump, after
how long with the pump running before a start attempt?
RonC
On Mon, 29 Feb 2016 08:40:15 -0800 James Hupy
writes:
> I use a mechanical pump and an auxiliary electric pump. It is a
> Carter 4070
> with a check valve bypass line. It is plumbed in line after the
> selector
> valve. It is preceeded by a metal cased 10 micron fuel filter. It
> is
> powered from the selector switch circuit so that when AUX is the
> selected
> tank, the electric pump runs. In every case that I have encountered
> so far,
> this setup will stop vapor lock in its tracks. It also will fill the
> carb
> after the coach sits for long periods. It works for me, and on carb
> equipped coaches that I work on for others, it is what I install to
> upgrade
> the system.
> Jim Hupy
> Salem, Or.
> 78 GMC ROYALE 403
Ron & Linda Clark
North Plains, ORYGUN
78 Eleganza II
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| Re: [GMCnet] How do those with a carb use they're electric fuel pump? [message #297734 is a reply to message #297731] |
Sun, 20 March 2016 14:30 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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When it sits for three weeks or longer and I don't run the electric pump,
It takes a couple of attempts of cranking for 20 seconds and several pumps
on the throttle. But, I don't normally do that.
My normal startup goes like this.
1. Turn fuel selector switch to "Aux".
2. Push the accelerator until feel a click which sets the choke. NEVER
FULLY DEPRESSED, AND NEVER MORE THAN ONE TIME.
3. Turn on ignition key, and listen for electric fuel pump. It will change
sound when it loads up, usually within 4 or 5 seconds.
4. Keep foot off accelerator and turn key to start.
5. MY 403 ALWAYS STARTS WITHIN 3 -5 seconds.
6. Let it run on fast idle without racing the engine. When it comes off of
fast idle, put it in gear and drive slowly until coolant temp is normal.
Jim Hupy
On Mar 20, 2016 12:08 PM, wrote:
>
> Jim, how long does it take to start your coach after a couple of weeks
> sitting, if you don't use the elec. fuel pump? Just wondering what's
> typical. And how long does it take to start using the elec pump, after
> how long with the pump running before a start attempt?
>
> RonC
>
>
> On Mon, 29 Feb 2016 08:40:15 -0800 James Hupy
> writes:
>> I use a mechanical pump and an auxiliary electric pump. It is a
>> Carter 4070
>> with a check valve bypass line. It is plumbed in line after the
>> selector
>> valve. It is preceeded by a metal cased 10 micron fuel filter. It
>> is
>> powered from the selector switch circuit so that when AUX is the
>> selected
>> tank, the electric pump runs. In every case that I have encountered
>> so far,
>> this setup will stop vapor lock in its tracks. It also will fill the
>> carb
>> after the coach sits for long periods. It works for me, and on carb
>> equipped coaches that I work on for others, it is what I install to
>> upgrade
>> the system.
>> Jim Hupy
>> Salem, Or.
>> 78 GMC ROYALE 403
>
> Ron & Linda Clark
> North Plains, ORYGUN
> 78 Eleganza II
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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