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Re: [GMCnet] Fuel Pump Poll [message #239370 is a reply to message #239364]

Mon, 10 February 2014 07:00

Ken Henderson

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

Karma:

Senior Member

Rob,

Fear of a ruptured mechanical diaphragm is only part of my refusal to pump
through one.

More important is the question of "why bother?". The benefits from the
rear-mounted electric pump argue in favor of it alone vs a mechanical pump
pump alone; it then follows that in case of a failure, I'd rather have
electrical redundancy than the mechanical pump.

Then there's the question of "why through?". It's trivially more difficult
to run the electrical pump in parallel with the mechanical pump (using
check valves), thus completely avoiding questions of pressure drop across
either of them as well as eliminating the diaphragm rupture question.

The real reason I originally installed the second pump, after deciding that
I would always have redundancy, was the abominable access to the Olds'
mechanical pump. It was a real PITA to get to the darned thing. The ease
of installation and maintenance of the electrical pump was child's play by
comparison, so when it came time to replace the mechanical, I resolved to
never fool with one again.

Finally, the elimination of the selector valve eliminated one more recently
failure-prone item, though mine went on to serve a new owner well.

So, while I was never paranoid about the hazard of diaphragm failure, I
just find it illogical to retain one.

JMHO,

Ken H.

On Mon, Feb 10, 2014 at 12:22 AM, Robert Mueller wrote:

> 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.

...
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
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		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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