| Electric fuel pump [message #351414] |
Fri, 17 January 2020 14:42  |
thigh19
Messages: 92
Registered: July 2019
Location: Vancouver Wa
Karma: 1
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I've heard members on this sight talking about electric fuel pumps on carb motors. Is this to prime the regular fuel pump? I've noticed than when I start my Sequoia after sitting for a while, it's a hard starter. Any recommendations on the fuel pump you all are using? Any tricks will be appreciated
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| Re: Electric fuel pump [message #351416 is a reply to message #351414] |
Fri, 17 January 2020 15:34  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Here's how I did it:
http://www.gmcmhphotos.com/photos/g6198-cane-9-creek-rv-park-heflin-2c-al.html
Blank flange the mechanical pump opening, and use the adapter on the hard line crossing the frame. Use the existing line to the selector to the tee on the pumps and put caps on the selector. In this manner you can return to stock by the road in 30 minutes. The relay is powered by the tank selector. The power it switches to either pump is fed from the ignition bus >through a Ford safety switch from an 05 ranger or an oil pressure switch>. If you use an oil pressure switch you need to run another wire up from the starter solenoid to the relay to power the pump during cranking. I use the Ford switch, high G or turnover trips it. The pumps are Mr. Gasket, but toss the supplied filters and fit the Wix replacements. The originals tend to leak at the swaged seam.
--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: Electric fuel pump [message #351417 is a reply to message #351414] |
Fri, 17 January 2020 15:37 |
bwevers
Messages: 597
Registered: October 2010
Location: San Jose
Karma: 5
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I've got the Carter P4070 wired to the fuel selector valve solenoid.
Jim Bounds has a description of this somewhere. It only pumps from the
reserve tank to the fuel select valve, boosting the fuel pressure when needed.
That would be when it's hot in stop and go traffic or driving in the mountains.
I hardly ever use mine except to prime the carburetor after it's been sitting awhile.
Bill Wevers GMC49ers, GMC Western States
1975 Glenbrook - Manny Powerdrive, OneTon
455 F Block, G heads
San Jose
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| Re: Electric fuel pump [message #351420 is a reply to message #351414] |
Fri, 17 January 2020 16:04 |
GMC Cruse
Messages: 606
Registered: June 2009
Location: SE Michigan
Karma: 3
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thigh19 wrote on Fri, 17 January 2020 15:42I've heard members on this sight talking about electric fuel pumps on carb motors. Is this to prime the regular fuel pump? I've noticed than when I start my Sequoia after sitting for a while, it's a hard starter. Any recommendations on the fuel pump you all are using? Any tricks will be appreciated
I run the Carter p4070 electric pump.
The cause of your problem could also be fuel bowel leakdown caused by leaking plugs in bottom of carb. This is a common problem, search this site or Google it. Most people epoxy them.
Mike K.
'75 PB
Southeast Michigan
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| Re: Electric fuel pump [message #351436 is a reply to message #351414] |
Sun, 19 January 2020 17:48 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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That's a mattwer of opinion and location and preference. I opted for all electric in my carbureted coach, I'm in the no foolin' hot summer Southeast. To me, mechanical and electric together represent the worst of both worlds... but as the pics show, my mechanical pump was toast anyway. Lots of folks opt for the single electric pump, which gives you electric aux tank and mechanical main. For me, that wouldn't likely work - I'd hate to be pulling Culowee in August and have the mechanical pump be insufficient while the gas left in the aux is all behind the pickup due to the grade. Vapor lock on that pull, which dam' near put me and the toad over the side, convinced me to do the dual electric thang. Purely personal preference.
--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: Electric fuel pump [message #351438 is a reply to message #351436] |
Sun, 19 January 2020 19:59 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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On our carbureted Eleganza II I used an inline rotary barrel type 5-6 lb electric pump as a back up and Plumbed on the front (auxiliary) tank and powered by the reserve tank switch off the solenoid. It only works when the tank is on reserve. On our Crestmont I used the same type pump in line in front of switching valve and used a manual switch only. Both coaches have stock fuel pumps on engine and I noticed no difference in normal driving the Crestmont pulling fuel thru the electric pump with it off. Mainly use it to prime carb after sitting for a few months or extra hot days coming off interstate to traffic lights and fuel seeming to vaporize in carb.
Johnny Bridges wrote on Sun, 19 January 2020 18:48That's a mattwer of opinion and location and preference. I opted for all electric in my carbureted coach, I'm in the no foolin' hot summer Southeast. To me, mechanical and electric together represent the worst of both worlds... but as the pics show, my mechanical pump was toast anyway. Lots of folks opt for the single electric pump, which gives you electric aux tank and mechanical main. For me, that wouldn't likely work - I'd hate to be pulling Culowee in August and have the mechanical pump be insufficient while the gas left in the aux is all behind the pickup due to the grade. Vapor lock on that pull, which dam' near put me and the toad over the side, convinced me to do the dual electric thang. Purely personal preference.
--johnny
C. Boyd
76 Crestmont
East Tennessee
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| Re: Electric fuel pump [message #351445 is a reply to message #351435] |
Mon, 20 January 2020 09:08 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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There are multiple way to install an electric fuel pump and once installed multiple ways to use it.
Some people choose to install 2 pumps, eliminate the mechanical pump, and run one all of the time. In this scenario, additional check and safety devices are necessary to prevent it from running after a crash or electrical failure. Two electric pumps are necessary in case of a single electric pump failure which will leave you stranded.
Others like myself, chose use a single electric pump and use it on demand while keeping the mechanical pump for normal operation. It is plumbed like my airplane and there only for emergencies and to initially fill the carb.
There are advantages to both. My coach fire was not caused by but was sustained by an electric pump that stuck on feeding gasoline everywhere. So consider why you are installing a pump and find a solution to fit your needs.
I seldom turn mine on but it is there if ever needed.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Electric fuel pump [message #351467 is a reply to message #351417] |
Mon, 20 January 2020 13:24 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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bwevers wrote on Fri, 17 January 2020 14:37I've got the Carter P4070 wired to the fuel selector valve solenoid.
Jim Bounds has a description of this somewhere. It only pumps from the
reserve tank to the fuel select valve, boosting the fuel pressure when needed.
That would be when it's hot in stop and go traffic or driving in the mountains.
I hardly ever use mine except to prime the carburetor after it's been sitting awhile.
I do what Bill said above, in addition, I have moved the pump, filter, selector valve and fuel hoses to the outside of the frame. I haven't had a single 'vapor lock' issue since doing that two years ago.
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: Electric fuel pump [message #351470 is a reply to message #351467] |
Mon, 20 January 2020 17:04 |
Wackster
Messages: 49
Registered: November 2017
Location: Baltimore
Karma: 0
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I second Ken Burton's reply. Mechanical pump has worked for me 99% of the time (except a couple instances of vapor lock coming off the highway on a 95+ degree days). For me, a must have to prevent stalling at an intersection or in traffic, however rare. Even without the threat of vapor lock, I believe it is worth having just for priming the carb after sitting awhile. My install is in line, 6 inches or so from the solenoid tank selector output, and controlled by an after-market on/off toggle installed on my lower dash. Powered only when ignition is on and used only when/if mechanical pump isn't getting the job done. I like the toggle style that lights when "On" so I can tell aux pump status at a glance.
Jim Wack - 1976 23' Crestmont
Baltimore, Maryland
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| Re: Electric fuel pump [message #351484 is a reply to message #351414] |
Tue, 21 January 2020 08:30 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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If you use the Mr Gasket pump(s) no external check valve is necessary - they have built in checks.
--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] Electric fuel pump [message #351662 is a reply to message #351414] |
Fri, 17 January 2020 15:20 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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In the use you are contemplating, I use a Carter 4070 electric pump. Plumb
it into the fuel line after the Main/Auxiliary selector valve. Power it
from the positive terminal of the selector valve, so you can select it from
the dash rocker switch. Many people also include a roll over/impact switch
in that circuit. Some wire it into a oil pressure switch, so that if the
engine is not running, neither does the fuel pump. Choice is yours.
Remember, safety first.
Jim Hupy
Salem, Oregon
On Fri, Jan 17, 2020, 12:43 PM Thom High via Gmclist <
gmclist@list.gmcnet.org> wrote:
> I've heard members on this sight talking about electric fuel pumps on carb
> motors. Is this to prime the regular fuel pump? I've noticed than when I
> start my Sequoia after sitting for a while, it's a hard starter. Any
> recommendations on the fuel pump you all are using? Any tricks will be
> appreciated
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: [GMCnet] Electric fuel pump [message #351686 is a reply to message #351438] |
Mon, 20 January 2020 08:51 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Our experience on rotary electric pump has required a bypass valve when not
operating. If your using a pulse pump, there is no need for a bypass.
On Sun, Jan 19, 2020 at 6:02 PM Charles Boyd via Gmclist <
gmclist@list.gmcnet.org> wrote:
> On our carbureted Eleganza II I used an inline rotary barrel type 5-6 lb
> electric pump as a back up and Plumbed on the front (auxiliary) tank and
> powered by the reserve tank switch off the solenoid. It only works when
> the tank is on reserve. On our Crestmont I used the same type pump in line
> in front of switching valve and used a manual switch only. Both coaches
> have stock fuel pumps on engine and I noticed no difference in normal
> driving
> the Crestmont pulling fuel thru the electric pump with it off. Mainly use
> it to prime carb after sitting for a few months or extra hot days coming
> off interstate to traffic lights and fuel seeming to vaporize in carb.
>
>
>
>
>
>
> Johnny Bridges wrote on Sun, 19 January 2020 18:48
>> That's a mattwer of opinion and location and preference. I opted for
> all electric in my carbureted coach, I'm in the no foolin' hot summer
>> Southeast. To me, mechanical and electric together represent the worst
> of both worlds... but as the pics show, my mechanical pump was toast anyway.
>> Lots of folks opt for the single electric pump, which gives you
> electric aux tank and mechanical main. For me, that wouldn't likely work -
> I'd
>> hate to be pulling Culowee in August and have the mechanical pump be
> insufficient while the gas left in the aux is all behind the pickup due to
> the
>> grade. Vapor lock on that pull, which dam' near put me and the toad
> over the side, convinced me to do the dual electric thang. Purely personal
>> preference.
>>
>> --johnny
>
>
> --
> C. Boyd
> 76 Crestmont
> East Tennessee
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmcrvparts.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] Electric fuel pump [message #351703 is a reply to message #351484] |
Tue, 21 January 2020 14:29 |
powwerjon
Messages: 849
Registered: March 2013
Karma: -2
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Senior Member |
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Johnny,
The pumps like this that I have used in the past did not have internal
check valves. When I checked the Mr Gasket literature and spec today
online it did not indicate an internal check valve is present, only a
filter is provided in the box. I also checked with Jeg's tech line and he
confirms that these pumps do not have an internal checks. If you do have a
link or short cut to such information please confirm.
https://www.jegs.com/i/Mr-Gasket/720/12S/10002/-1
https://www.jegs.com/i/JEGS/555/15928/10002/-1
J.R. Wright
GMC Great Laker
GMCGL Tech Editor
GMC Eastern States
GMCMHI
TZE Zone Restorations
78 Buskirk Custom 29.5' Stretch
75 Avion (Under going Frame up Restoration)
On Tue, Jan 21, 2020 at 7:31 AM Johnny Bridges via Gmclist <
gmclist@list.gmcnet.org> wrote:
> If you use the Mr Gasket pump(s) no external check valve is necessary -
> they have built in checks.
>
> --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
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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