Home » Public Forums » GMCnet » Aux Fuel Pump (Aux Fuel Pump)
| Aux Fuel Pump [message #205886] |
Thu, 25 April 2013 19:13  |
erichb
Messages: 22
Registered: February 2013
Karma: 0
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Junior Member |
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Ok, now that spring is finally here in MN time to tackle some projects.
So Ive read many of the threads here on the topic and conclude I want to go with Elec Pump on the Aux
Whats the right pump and most straighforward wiring plan. I am not the only driver of the coach so I need to plan/think for others as well
For location, is it best to put filter between the selector and the pump or perhap put two filters in front of the selector or lastly put the filter after he pump and remove the carb filter. Sounds like there isnt a lot of problems with plugged filters so I presume all are fine, just thinking mechanically about the spacing between the components and creating the most relaible set-up.
I do appear to have a bad sender in the Aux as it pegs to full when switched and also when Full-Full on the tanks and downhill I get a good flow of fuel spilling so I pesume the seals at the sender or senders are bad in some manner. Hoses look to have been updated and feel fine when reaching up and exploring
I think I will go at those through the floor in lieu of dropping the tanks as I have a bare floor an will make plates for later access
It will set for a few weeks at atime, so being able to prime ita little will be helpful. Is there a issue with running it for an extended time period on Aux with this setup ? I ask since I need to think of the others who may be drivng the rig. Perhaps replace the mechanical pump at same time, I do not know the agef that one.
Probbably need to consider the crossover blockoff mod as well. I am pulling heads to clean up an replace the leaking head gaskets and tis might be a good time to address....thouhts
thanks
73 Canyonlands, Fresh TH425 and FD, Bags and Pins updated. Needs A/C, Top and Front service....Minneapolis
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| Re: [GMCnet] Aux Fuel Pump [message #205919 is a reply to message #205886] |
Thu, 25 April 2013 21:37  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Erich,
Here's the JimB easy fix for vapor lock.
Install one of the Facet pumps below in the line that comes from the Aux tank to the selector valve. Wire it to the selector valve.
When you switch to AUX the pump comes on and pressurizes the inlet of the mechanical fuel pump. I've used it for the past three
years and it works very well.
DOWNSIDE: if you have a fuel pump with a weak diaphragm it is possible that the pressure from this pump could tear it and fill the
crankcase with fuel.
12 VOLT FACETR CUBE FUEL PUMPS
PART #: 40104
MIN - MAX PSI: 1.5 - 4.0
GPH: 25
INLET/OUTLET THREAD SIZE: 1/8-27 NPT
MIN. DRY LIFT: 12"
CHECK VALVE: NO
It is also a good idea to install a fuel filter in the rubber line that attaches the steel line attached to the front cross member
to the mechanical fuel pump inlet.
Regards,
Rob M.
-----Original Message-----
From: Erich Beaulieu
Ok, now that spring is finally here in MN time to tackle some projects.
So Ive read many of the threads here on the topic and conclude I want to go with Elec Pump on the Aux
Whats the right pump and most straighforward wiring plan. I am not the only driver of the coach so I need to plan/think for others
as well
For location, is it best to put filter between the selector and the pump or perhap put two filters in front of the selector or
lastly put the filter after he pump and remove the carb filter. Sounds like there isnt a lot of problems with plugged filters so I
presume all are fine, just thinking mechanically about the spacing between the components and creating the most relaible set-up.
I do appear to have a bad sender in the Aux as it pegs to full when switched and also when Full-Full on the tanks and downhill I get
a good flow of fuel spilling so I pesume the seals at the sender or senders are bad in some manner. Hoses look to have been
updated and feel fine when reaching up and exploring
I think I will go at those through the floor in lieu of dropping the tanks as I have a bare floor an will make plates for later
access
It will set for a few weeks at atime, so being able to prime ita little will be helpful. Is there a issue with running it for an
extended time period on Aux with this setup ? I ask since I need to think of the others who may be drivng the rig. Perhaps replace
the mechanical pump at same time, I do not know the agef that one.
Probbably need to consider the crossover blockoff mod as well. I am pulling heads to clean up an replace the leaking head gaskets
and tis might be a good time to address....thouhts
thanks
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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: Aux Fuel Pump [message #205950 is a reply to message #205948] |
Fri, 26 April 2013 06:29 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Senior Member |
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Fuel filter before the fuel pump. Fuel pump mounted along side frame rail for physical protection. Mine is on the inside. I like the idea of tied to aux fuel switch, but I have a remote switch on the dash. No problem "accidentally" running with eletric pump on full time. CRS gets in the way sometimes. Facet makes good pumps and are everywhere.
Tom, MS II
Bean Station in six days
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: Aux Fuel Pump [message #205962 is a reply to message #205886] |
Fri, 26 April 2013 07:53 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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You should make a trip up to st. cloud this weekend. I can show you how mine is done. Pretty much the same as Jim Bounds method.
I have a carter 4070 in my grand wagoneer. that is supposed to be considered a superior pump to the facet. not sure about the pass through like Jim says. but it is bigger, and harder to mount. the facet style pump is a really simple quick installation. also less expensive.
I have the facets, on my aux of my gmc, on my onan, and on my vw dune buggy. have not had a problem... yet. If I do, the facet style is all over the place, and the carter 4070 is slightly harder to come by.
will be trying to get some production on my gmc this weekend. have three weekends now before my first state park camp trip.
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] Aux Fuel Pump [message #205995 is a reply to message #205990] |
Fri, 26 April 2013 11:47 |
Dwayne
Messages: 418
Registered: October 2007
Location: White Rock BC
Karma: 0
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Senior Member |
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Jim
Can you send me a wiring diagram and info on the filter and pumps you
used. I like this idea the mostest. (i know it's really not a word)
I was with Jim Hupy last weekend to attend his wedding (wonderful) and he
said I should look at this set up. Jim K also attended.
I have to do a word study on the Name "Jim" because it seems in the GMC
World they are vital to keeping us on the road.
regards
Dwayne Jacobson
White Rock
77 Kingsley
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Dwayne & Sharon Jacobson
White Rock, BC
77 Eleganza II
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| Re: [GMCnet] Aux Fuel Pump [message #205999 is a reply to message #205995] |
Fri, 26 April 2013 12:26 |
Jim Bounds
Messages: 842
Registered: January 2004
Karma: 0
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Senior Member |
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The diagram is ultimatly simple, there is a black wire supplying power to your A/B selector solenoid-- tap the hot side of your fuel pump there and connect the black to a good ground. The only other thing you may want to do is change out the "fuel" fuse in the fuse box in the glove box from a 10 amp to a 15 amp since the pump will pull power through it. Really, that's it! The pump is a 4-6 psi Facet brand pump, you can also use Purolator, Mr. Gasket makes one. It's a cheap little pump, you could use anything I just prefer this one since it's small and easy to install.
If you run a carb and mechanical fuel pump, this is a really easy mod that have saved many people. Here in Florida in the summer, I leave my coach in the aux mode while in town, I know the motor will vapor lock in traffis, at a toll booth, etc.
Good luck,
Jim Bounds
-----------------
________________________________
From: Dwayne Jacobson <dwayne@havenproperties.ca>
To: "gmclist@temp.gmcnet.org" <gmclist@temp.gmcnet.org>
Sent: Friday, April 26, 2013 12:47 PM
Subject: Re: [GMCnet] Aux Fuel Pump
Jim
Can you send me a wiring diagram and info on the filter and pumps you
used. I like this idea the mostest. (i know it's really not a word)
I was with Jim Hupy last weekend to attend his wedding (wonderful) and he
said I should look at this set up. Jim K also attended.
I have to do a word study on the Name "Jim" because it seems in the GMC
World they are vital to keeping us on the road.
regards
Dwayne Jacobson
White Rock
77 Kingsley
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| Re: Aux Fuel Pump [message #206056 is a reply to message #205886] |
Fri, 26 April 2013 20:08 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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| erichb wrote on Thu, 25 April 2013 17:13 |
...
I do appear to have a bad sender in the Aux as it pegs to full when switched ...
...
I think I will go at those through the floor in lieu of dropping the tanks as I have a bare floor an will make plates for later access...
...thouhts
|
If there is an "open" in the circuit, the fuel gauge will peg full. How do I know this? On my '73, I had to re-drop the front tank to re-connect a connector after installing the tanks. The "open can be on the ground side or the "power" side, so you'll need to check your wiring for breaks.
If you haven't replace the rubber hoses on the top of the tanks, I would drop the tanks at least the first time. There are hoses on the top the tank (vent lines) that can not be replaced through a little hole on the top.
Others have provided input on pumps. I am not very "keen" on running pressurized fuel into a mechanical fuel pump bolted to the crank case. I know a problem isn't THAT likely, but you do not know my luck! 
If you do this, try not to use it "full time,"
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: Aux Fuel Pump [message #206276 is a reply to message #205886] |
Sun, 28 April 2013 22:03 |
erichb
Messages: 22
Registered: February 2013
Karma: 0
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Junior Member |
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thanks to all for the posts. Mr Gasket appears to be on the shelves here more readily in Mpls. Im sure I can order any of the many flavors though
So last question on this is related to max psi in the Aux set up controlled by the the selector. 2.5-4 psi or 4-7 psi. Im thinking the 4-7 but curious to understand the safe/practical upper limit in this set up.
I Will probably buy two and use one as a portable transfer pump and carry as a spare on out of town trips.
thanks again
73 Canyonlands, Fresh TH425 and FD, Bags and Pins updated. Needs A/C, Top and Front service....Minneapolis
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| Re: [GMCnet] Aux Fuel Pump [message #206314 is a reply to message #206278] |
Mon, 29 April 2013 06:58 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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All the more reason to bypass the mechanical pump: The additional pressure
from the 4-7 psi pump may be what's needed to suppress vapor lock.
Ken H.
On Sun, Apr 28, 2013 at 11:18 PM, Rob Mueller wrote:
> Erich,
>
> As noted in my original email I have the 1.5 to 4 psi Facet pump installed
> in Double Trouble and it works just fine.
>
> You're looking at the problem thinking MORE is BETTER. That is a bit
> backwards; you DON'T want the MAXIMUM pressure going to the
> mechanical fuel pump you want the MINIMUM pressure that will overcome
> vapor lock.
>
> The higher the pressure you supply to the mechanical pump the greater the
> risk of problems.
>
> Regards,
> Rob M.
>
> -----Original Message-----
> From: Erich Beaulieu
>
> thanks to all for the posts. Mr Gasket appears to be on the shelves here
> more readily in Mpls. Im sure I can order any of the
> many flavors though
>
> So last question on this is related to max psi in the Aux set up
> controlled by the the selector. 2.5-4 psi or 4-7 psi. Im
> thinking the 4-7 but curious to understand the safe/practical upper limit
> in this set up.
>
> I Will probably buy two and use one as a portable transfer pump and carry
> as a spare on out of town trips.
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Aux Fuel Pump [message #206319 is a reply to message #205886] |
Mon, 29 April 2013 07:48 |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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Forgive the late response to your post but I'm still pondering Spring
actually coming to MN. If so, winter must be just around the corner so
park the thing and continue to add to the bucket list :>)
Steve F
On Thu, Apr 25, 2013 at 5:13 PM, Erich Beaulieu <erichbeaulieu@yahoo.com>wrote:
>
>
> Ok, now that spring is finally here in MN time to tackle some projects.
>
> So Ive read many of the threads here on the topic and conclude I want to
> go with Elec Pump on the Aux
>
> Whats the right pump and most straighforward wiring plan. I am not the
> only driver of the coach so I need to plan/think for others as well
>
> For location, is it best to put filter between the selector and the pump
> or perhap put two filters in front of the selector or lastly put the filter
> after he pump and remove the carb filter. Sounds like there isnt a lot of
> problems with plugged filters so I presume all are fine, just thinking
> mechanically about the spacing between the components and creating the most
> relaible set-up.
>
> I do appear to have a bad sender in the Aux as it pegs to full when
> switched and also when Full-Full on the tanks and downhill I get a good
> flow of fuel spilling so I pesume the seals at the sender or senders are
> bad in some manner. Hoses look to have been updated and feel fine when
> reaching up and exploring
>
> I think I will go at those through the floor in lieu of dropping the tanks
> as I have a bare floor an will make plates for later access
>
> It will set for a few weeks at atime, so being able to prime ita little
> will be helpful. Is there a issue with running it for an extended time
> period on Aux with this setup ? I ask since I need to think of the others
> who may be drivng the rig. Perhaps replace the mechanical pump at same
> time, I do not know the agef that one.
>
> Probbably need to consider the crossover blockoff mod as well. I am
> pulling heads to clean up an replace the leaking head gaskets and tis might
> be a good time to address....thouhts
>
> thanks
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Take care,
Steve
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