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Re: [GMCnet] Fuel Pump Poll [message #239364 is a reply to message #239361]

Sun, 09 February 2014 23:22

USAussie

Messages: 15912
Registered: July 2007
Location: Sydney, Australia

Karma:

Senior Member

Ken,

Naturally I respect your point of view, however, I'll bet JimB has installed lots of these little pumps which put out 1 to 4.75 psi
and to date I haven't heard anyone noting their crankcase got pumped full of gas. GeneF noted that he was aware of two engines that
got trashed when the owner moved the mechanical fuel pump with a leaking diaphragm from a failed engine to the new engine.

I assume that the 4.75 psi is deadheaded and I'd be willing to wager under flow conditions the pressure they supply to the
mechanical pump inlet is down around a couple of psi. When one considers the 15 feet (?) of hose and the metal tube across the
bottom of the front cross member I'll bet it's even lower. Naturally when the float bowls are full they could supply the full 4.75
psi as the "system" would be deadheaded.

If I can find the time when I get back to the USA I'll try and run a test to see just how much pressure it does supply at the inlet
to the mechanical pump.

I AGREE that you could fill your crankcase with fuel and ruin the engine, however, I'm willing to take that risk as in my view
problems that could arise if the engine quits due to vapor lock are greater.

Yes there are other ways around the vapor lock problem but the Facet pump is the quickest and easiest solution.

Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426

-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ken Henderson
Sent: Monday, February 10, 2014 3:44 PM
To: gmclist
Subject: Re: [GMCnet] Fuel Pump Poll

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.

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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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[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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