Holley electric pump need a regulator?

[Telecasterjoey]

Hey guys, I've been thinking bout my new fuel delivery setup and I don't like it. I've got a new tank, sending unit, and Holley red 5-7 psi electric pump. The way it's routed now is the pump runs inline with no return lines.

Does the pump constantly push 7 psi into my carb or will it slow once the bowl fills in the carb? Say the truck is idling and only burning half of the fuel coming from the pump where does the excess go? If I had a regulator with a return line how would it know when the bowl is full and when it's not?

I'd rather not use an electric pump but the engine I'm using is from a 1990.

Any help would be appreciated

Thanks!
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[Desert1957]

If this is the pump you have, you do not need a regulator.

http://www.holley.com/12-801-1.asp

Desert

[Telecasterjoey]

Thanks for the reply that's the pump, I know I lt says I don't need one but I think I'm more curious as to how the carb holds the pressure back.
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[Telecasterjoey]

New question if I shut the engine off and turned on the pump, would I flood my
Truck or would the pump know to let the fuel run back?
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[Desert1957]

"New question if I shut the engine off and turned on the pump, would I flood my
Truck or would the pump know to let the fuel run back?"


No , A Functioning needle and seat in any carburetor will hold back 5-7 psi ,maybe even a few pounds more. Don't forget any thing with a manual fuel pump has a small amount of pressure when the engine is turned off. If its the carb is in good shape it will not flood the intake after shutting the engine off.

Now if you crazy on the fuel pressure like 10-40 psi you could override the carb and fill the engine up with fuel , not a good senario.

Dez

[Telecasterjoey]

Ok awesome! Thanks man, That means I don't have to change anything!
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