Fuel Pump

L

larry & kaye kepple

New member
Jan 4, 1999
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My 73 GMC has an electric fuel pump installed by the previous owner.The
fuel pump is a Carter and is located near tanks under coach. A can type
filter was installed near the discharge of the pump. Rubber hoses are
used from the two tanks to the pump and filter and then a steel pipe to
the engine. I think there is a short section of rubber hose at engine
connection. The system seems to work fine but its a noisy little bugger
and I am concerned about safety. I have a manual switch for it, but no
safety feature to cut off pump if engine isn't running. I have seen
suggestions of using an oil pressure switch to do this. But I am
thinking about changing it back to the factory system, which of course
means returning to a pump with its suction above the tank.(This is what
Wes Caughflin suggested); My question is whether those of you with the
original factory system are satisfied or do you have problems with vapor
lock or fuel pump priming causing problems starting engine. Larry.
 
Purolator makes a little electric interrupter fuel pump I use on our boat to
polish the diesel fuel.

I bought mine, in Virginia, at Advance Automotive Stores for around $30
each.

Fuel can be drawn through them when they are not running and they require
little current to operate. They make a clicking sound when operating but
less noise than most interrupter pumps do.

I mount these pumps on rubber shock mounts which greatly reduces the
conduction of noise.

For Quadrajet newbies:

Sometimes the fuel pump gets blamed for slow starting when the problem is
the carburetor.

A Quadrajet problem over the years has been leaking carburetor well plugs.
The float bowl will slowly empty over a period of time. A couple of dabs
of epoxy seals these plugs and usually helps the slow starting problem.

My 75 Glennbrook project has this problem and the Quadrajet overhaul has
worked its way up to item number 52 on my GMC work list.

Don
Shenandoah Valley of Virginia
 
My question is whether those of you with the
> original factory system are satisfied or do you have problems with vapor
> lock or fuel pump priming causing problems starting engine. Larry.

Larry,
No problems with regard to both of your questions. With the OEM fuel
pump I've never had a vapor lock and I've been at over 10,000 feet
elevation several times and even more times at 100 degrees plus.
Yes, it does take a few seconds to prime the carb but that also allows
oil pressure to build up before the engine fires. I believe that with a
properly tuned engine and carb you should have no problems with going
back to OEM.
Phil Stewart
'76 Transmode
 
Chris:

Are you asking about the pros and cons of the original vs. electric types,
brands, or what?

Paul Bartz

- -----Original Message-----
From: chris izzig [mailto:i.chris]
Sent: Monday, March 08, 1999 1:05 PM
To: gmcmotorhome
Subject: GMC: fuel pump

any recommondations on a fuel pump?

thanx chris 75 gb

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