Electric Fuep Pump

[frank folkmann]

I have installed a Caspro electric fuel pump removing the mechanical pump.
This pump came from a GMC coach and worked fine. In my installation it will
not shut down but pump till the gas is flooding out the carburetor.
Thinking there was a problem with float needle and seat a carburetor
overhaul was performed. This did not help as the same problem exits. Caspro
informed me that the pump has 4 - 5 1/2 PSI. Any suggestions?

 

[antnip]

I too have an electric pump setup and all was well for many years. I had
some loose adjustments and other problems with my old carb and in yet
another misguided attempt to fix what ain't really broke, ordered a "direct
bolt on replacement" from one of the better known GMC suppliers out there
(I'll be nice about names).

It turns out they were charging a premium price for the same rebuilt stuff I
could have gotten a lot cheaper at any NAPA. After "bolting" on, I had major
problems, the same flooding problem you describe. All over the top of the
engine and intake. I'm lucky I didn't have a fire. I also noted several
loose screws, and the fact there was a dead plate on the choke "no more
adjust". There was rust on the internal parts and it was a poor rebuild.

After I had the flooding, I was told my fuel pump was bad and putting out
too much pressure. I put in a fuel pressure regulator and had same problem.
I spoke to a local mechanic friend, and the first words out of his mouth
were" I bet it was one of those XXXco rebuilds" and he was exactly right! He
told me their work was crap, and in one case it took 3 tries before he got a
carb that worked right!

He said the vast majority of these problems are a result of poor rebuilds or
worn needle/float setups, not pressure problems.

So, I solved my problem by sending the piece of junk back from whence it
came, telling them where they could "directly bolt on" there junk, and got a
top shelf rebuild from a local speed shop that deals in these Jet Fuel
products. Here is a link to the manufacturer.

http://www.jetchip.com/

http://www.jetchip.com/fuel/streetmaster800.cfm

Got the stage 1 carb., electric choke, float level adjust, all parts
properly plated. Good stuff! Top shelf work. Problem solved.

My advice (which is basically a summary of the advice I got) would be check
your fuel pressure. If it is okay, try another rebuild on the carb.

Good luck. Tony Bad

- ----- Original Message -----
From: Frank Folkmann
To:
Sent: Saturday, February 26, 2000 8:13 PM
Subject: GMC: Electric Fuep Pump

> I have installed a Caspro electric fuel pump removing the mechanical pump.
> This pump came from a GMC coach and worked fine. In my installation it
will
> not shut down but pump till the gas is flooding out the carburetor.
> Thinking there was a problem with float needle and seat a carburetor
> overhaul was performed. This did not help as the same problem exits.
Caspro
> informed me that the pump has 4 - 5 1/2 PSI. Any suggestions?
>
>

 

[gene]

hI had the electric pump for years and kept the mechanical , no problems.
Just no more vapor locks.

gene

>I have installed a Caspro electric fuel pump removing the mechanical pump.
>This pump came from a GMC coach and worked fine. In my installation it will
>not shut down but pump till the gas is flooding out the carburetor.
>Thinking there was a problem with float needle and seat a carburetor
>overhaul was performed. This did not help as the same problem exits. Caspro
>informed me that the pump has 4 - 5 1/2 PSI. Any suggestions?
>
>
Genef -- 77PB/ore/ca
GMC MOTORHOME INFORMATION
mr.erf
http://www.california.com/~eagle/

 

[travism]

> I have installed a Caspro electric fuel pump removing the mechanical pump.
> This pump came from a GMC coach and worked fine. In my installation it
will
> not shut down but pump till the gas is flooding out the carburetor.
> Thinking there was a problem with float needle and seat a carburetor
> overhaul was performed. This did not help as the same problem exits.
Caspro
> informed me that the pump has 4 - 5 1/2 PSI. Any suggestions?

One of 'em is mistaken. If the pressure is 4 - 5 1/2 PSI and the needle and
float are like they should be, you won't have a problem. So either the carb
has a problem or the pump does. I'd guess a 90% chance it's the carb and 10%
to the pump. If you can put a gauge on it, you'll know right away.

But while we're on the subject, let me preach just a little: whatever else
you do, DO NOT install an electric fuel pump that can run with the engine
dead. In the event of an accident or a leak, a ruptured hose, for example,
if the pump continues to add gasoline to a fire the results can be tragic.

The factory method for dealing with this is an oil pressure sender that has
a set of contacts to series with the wire to the pump. If the engine dies,
oil pressure falls off and the power to the pump is interrupted. I have also
heard of people running the pump off of the alternator.

There is nothing wrong with having a "prime" switch wired around this safety
switch to bring fuel to an engine that hasn't been started in a good while,
but only if it is a momentary contact switch that can't be inadvertently
left on, defeating the safety switch.

I'll get back down from the pulpit now. Best of luck,

Travis