LarryM

Member
I am looking for a low pressure fuel pump say 2-3 psi not 3-6 for the purpose of providing enough fuel under higher horsepower. If possible I would like to be able to only use it when going down the track. Will they allow fuel to pass through when off or do they have to urn all the time? Any pump that people like better than others?
 
nothing wrong with 4 - 6 #z. yes needs to be on(run)when pulling,or why have it ???????????????????????????????????
 
(quoted from post at 14:53:49 07/10/18) nothing wrong with 4 - 6 #z. yes needs to be on(run)when pulling,or why have it ???????????????????????????????????

53, you may want to read the OP again.
 
I once asked a man on a park bench for directions to the nearest auto parts store and man relied with why a person should not own a car. This reminds me of that.
 
I now remember why I don't come here much. Whenever I ask a question I get people telling me in one way or another that my question was stupid.
 
We use this one. It comes with a regulator so you can set whatever pressure you want.
a273058.jpg
 
(quoted from post at 19:27:42 07/10/18) I once asked a man on a park bench for directions to the nearest auto parts store and man relied with why a person should not own a car. This reminds me of that.

Yes Larry, it is plain to me that you asked if it needs to be on when not pulling, and the answer you got was yes it needs to be on when pulling.
 
I have seen some that will allow
gravity feed when not turned on. Flow
is restricted, however. Not
advisable to do much more than high
idle without pump running. I suggest
a low psi pump. I run 1.5-3. Too much
pressure will over power the needle
valve in carburetor.
 
(quoted from post at 14:08:39 07/10/18) I am looking for a low pressure fuel pump say 2-3 psi not 3-6 for the purpose of providing enough fuel under higher horsepower. If possible I would like to be able to only use it when going down the track. Will they allow fuel to pass through when off or do they have to urn all the time? Any pump that people like better than others?

I have used the "micro electric pumps" similar the Holley as in Ollie88D's post. Typically the pumps contain an inlet check valve which will cause some restriction for gravity flow systems with the pump off. To check just blow through the pump, it will pass air in the inlet to outlet direction and not in the reverse direction. If you have difficulty blowing through the pump then it will likely cause a restriction when not powered.

Beside me, I have a new Mr Gasket pump; # 42S, 2 - 3.5 Psi at 28 GPH. I did the blow test as I write this - non-powered, I would not expect it to pass fuel for your application.

As a suggestion: Have you considered a restricted return line back to the tank, for use with the electric pump. With the pump powered, the pump would supply pressurized fuel to the carburetor and small amount of fuel is returned to the tank. With the pump non-powered fuel is gravity fed to the carburetor through the return line. A restrictor of 1/16" diameter may be a good place to start depending on your engine size. The restricted return line may require use of a slightly higher pressure pump as the return flow will lower the pump output pressure.

Good Luckl
 

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