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Re: [GMCnet] Fuel Pump Poll [message #239361 is a reply to message #239357]

Sun, 09 February 2014 22:43

Ken Henderson

Messages: 8726
Registered: March 2004
Location: Americus, GA

Karma:

Senior Member

The only time I ever fed a mechanical pump from an electric pump, it was
accidental. To prepare the GMC for possible vapor lock in the western
mountains on the way to Alaska in 2000, I installed an electric pump and
tee'd the two outputs just before the carb. Depending on the mechanical
pump's output valve to prevent flow from the electrical pump into the
mechanical pump, I did not install any check valves. At the service
station inside the eastern entrance to Yellowstone NP, I found gas coming
out the TOP of the mechanical pump. Sure 'nuff, the output valve, and the
top seal on the mechanical pump had failed, dumping gas FAST.

Fortunately, I had a pipe plug so was able to eliminate the mechanical pump
and did the remaining 10,000+ miles of the trip with only the electrical
pump -- which was one of the two Carter 4070's I'm still running.

I'd NEVER intentionally feed a mechanical pump, attached to the crankcase,
from another pump.

Ken H.

On Sun, Feb 9, 2014 at 11:19 PM, Robert Mueller wrote:

> Ken,
>
> The downside to installing an electric pump to feed the mechanical pump is
> that if the diaphragm in the mechanical pump fails you
> can pump the crankcase full of fuel and destroy the engine.
> ...
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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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[Message index]

		Fuel Pump Poll By: jturbo on Wed, 04 September 2013 03:44
		Re: Fuel Pimp Poll By: kerry pinkerton on Wed, 04 September 2013 06:03
		Re: [GMCnet] Fuel Pimp Poll By: mtnman111 on Wed, 04 September 2013 17:07
		Re: Fuel Pimp Poll By: rvanwin on Wed, 04 September 2013 06:54
		Re: Fuel Pimp Poll By: RF_Burns on Wed, 04 September 2013 07:11
		Re: Fuel Pimp Poll By: George Beckman on Wed, 04 September 2013 07:25
		Re: Fuel Pimp Poll By: jturbo on Wed, 04 September 2013 11:45
		Re: Fuel Pimp Poll By: habbyguy on Wed, 04 September 2013 09:54
		Re: Fuel Pimp Poll By: bwevers on Wed, 04 September 2013 10:13
		Re: Fuel Pump Poll By: bobby5832708 on Wed, 04 September 2013 17:43
		Re: Fuel Pump Poll By: mikethebike on Fri, 07 February 2014 15:23
		Re: Fuel Pump Poll By: corleyw on Fri, 07 February 2014 18:47
		Re: Fuel Pump Poll By: Bob de Kruyff on Fri, 07 February 2014 18:49
		Re: [GMCnet] Fuel Pump Poll By: USAussie on Fri, 07 February 2014 21:36
		Re: [GMCnet] Fuel Pump Poll By: Bob de Kruyff on Fri, 07 February 2014 21:54
		Re: Fuel Pump Poll By: Ken Burton on Sat, 08 February 2014 01:22
		Re: Fuel Pump Poll By: Bob de Kruyff on Sat, 08 February 2014 09:35
		Re: [GMCnet] Fuel Pump Poll By: jimk on Sat, 08 February 2014 10:03
		Re: [GMCnet] Fuel Pump Poll By: Bob de Kruyff on Sat, 08 February 2014 10:59
		Re: [GMCnet] Fuel Pump Poll By: Ken Burton on Sat, 08 February 2014 11:19
		Re: [GMCnet] Fuel Pump Poll By: USAussie on Sat, 08 February 2014 17:53
		Re: [GMCnet] Fuel Pump Poll By: Ken Burton on Sun, 09 February 2014 23:58
		Re: Fuel Pump Poll By: pyolet on Fri, 07 February 2014 21:26
		Re: Fuel Pump Poll By: mikethebike on Sat, 08 February 2014 18:42
		Re: Fuel Pump Poll By: kerry pinkerton on Sat, 08 February 2014 18:26
		Re: [GMCnet] Fuel Pump Poll By: USAussie on Sat, 08 February 2014 18:52
		Re: [GMCnet] Fuel Pump Poll By: Ken Henderson on Sun, 09 February 2014 20:51
		Re: [GMCnet] Fuel Pump Poll By: USAussie on Sun, 09 February 2014 22:19
		Re: [GMCnet] Fuel Pump Poll By: Ken Henderson on Sun, 09 February 2014 22:43
		Re: [GMCnet] Fuel Pump Poll By: USAussie on Sun, 09 February 2014 23:22
		Re: [GMCnet] Fuel Pump Poll By: Ken Henderson on Mon, 10 February 2014 07:00
		Re: [GMCnet] Fuel Pump Poll By: USAussie on Mon, 10 February 2014 07:18
		Re: [GMCnet] Fuel Pump Poll By: jhbridges on Mon, 10 February 2014 13:16
		Re: [GMCnet] Fuel Pump Poll By: James Hupy on Mon, 10 February 2014 13:44
		Re: [GMCnet] Fuel Pump Poll By: jhbridges on Mon, 10 February 2014 17:56
		Re: [GMCnet] Fuel Pump Poll By: Ken Burton on Mon, 10 February 2014 20:36
		Re: [GMCnet] Fuel Pump Poll By: dwayne jacobson[1] on Tue, 11 February 2014 13:12
		Re: [GMCnet] Fuel Pump Poll By: Bob de Kruyff on Mon, 10 February 2014 20:21

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