Technical > Spud Miller's Cave

Pump speed V delivery

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retroboy:
Hello I have an Enderle 80A-1 pump I previous ran with injection. I want to run that pump on a carburetored engine now and have a Holley return type regulator. The pump is still delivering more than needed so I figured I can run a smaller drive pulley and slow the pump a little. If I drop a few teeth off and the pulley ratio is around 10% less does that mean the pump would deliver 10% less or would that be too simple?

JEFF/21C:
I ran a hilbourn pump with a check valve at 9# with a poppet valve and  =8 return line 950 holley on alky

Curly1:
I would not slow the pump down much, I would just return more of the fuel back to the tank. With right check valves you could set idle pressure at 5 or so and have 10 wide open if you wanted.

wideopen231:
Running pump slower is fine. It is not linear but close to amount slowed. Only way to know exact would be flow test. If dropping 10% on 7 gpm pump you would loose about .7 gpm. Never slowed one down but have sped them up and they followed that so only stands to reason it will work same.You could just run a pump sizer which basically is just a jetted line to bypass x amount of fuel. Would be easy to adjust and changes are just a jet,spring or shim in a poppet.

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