Re: fuel pump stumper

[rll <rlipinski3@xxxxxxx>]

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Date: Wed, 02 Nov 2005 13:49:27 -0800
From: "Robert  neal zimmerman" <northwestweirdo@xxxxxxxxxxx>
Subject: Re: fuel pump stumper

OK there , thats what i wanted to hear, what happens to the fuel when
the needle/seat is closed? all that gas has to go somewhere! I know on
some systems theres an actual return to the tank, but on the stock
mechanical sydstem the pump keeps pumpin no matter what. Wheres that gas
go when the needle/seat is shut.
  Neal Zimmerman, eugene Oregon

Neal and list....

When the float closes the valve it does the same thing the float in your
toilet tank is susposed to do, stops the flow.

Late 60's mopars had a fuel filter with three lines on them, fuel in fuel out, and a small
line that was a return to the fuel tank. 

This would allow fuel to flow back to the gas tank when the float in the carb was closed.

It also relieved the pressure between the pump and carb after the engine was shut down. 

Another claim is that by circulating fuel back to the tank vaporlock was reduced by
lowering fuel temp....hard to believe that as the return line was very small.

Someone asked about a higher pressure pump and if a stock carb would handle it....

A stock 69 charger had a 4640 AVS carter carb, the fuel pressure on a 69 rt was speced at
6 to 7 1/2 pounds. The AVS had no problem with these numbers.

When we were running a sixpack setup on this car that high of fuel pressure would push by
the needles and seats of the two barrel holleys.

We discovered this while i was trying to get rid of a rich idle problem...pulled and pugged the 
fuel lines and were running the carbs out of gas to check the float levels....the idle smoothed
out and cleaned up as we were doing this.

A fuel regulator set at 5 psi fixed all problems.

Plus a 1/2 inch ID line from tank forward

And a carter pump in the back

And carb vent plumbing to keep the center hung floats from blowing fuel 20 feet into the air on
a launch without hood or aircleaner....

all part of a learning curve..trying to get a 4000 lb street car down the strip with a budget.

rob in phx
65 sat 



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