I picked up a walbro pump that is rated for 45 psi. I'm running a holley carb and have a regulator before carb, do you think I need to have a return line?
Intank pump and need for return line
- Thread starter ed1946
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dano
Evil Handy Man
At 45 psi? I'd say Yes. Your carb will only need 5-6psi. Is your regulator up to the task? When I ask Aeromotive on running an 60psi with a carb (with plans for EFI later) they stated you need a special or multiple regulator for that much return although I found folks doing it with one, lesser regulator and reporting no issues. Your going to want a 3/8 or 1/2 return.
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I kinda figured as much, I've got a good holley regulator. Do these pumps shut down when they get to advertised psi or just keep on pumping.
SLOPAR72
Well-Known Member
I would recommend it. Since you will have to change to a return style regulator if you don't have one I also recommend putting the regulator in the return line, so the carburetor is essentially in the center of the loop.
Sounds like a good plan, thanks
jbc426
Well-Known Member
The pumps run continuously, and if used with a deadhead regulator they will heat up significantly, which can shorten the life span of the pump . Most manufacturers want a return style regulator to be used, so the fuel flowing through the fuel pump can cool the pump.
I used a Fuelabs two speed pump with a bypass regulator, and mounted a small switch that triggers the higher pump speed when the secondaries open. The pump is designed to run cool and continuously at the low speed and flow a much higher volume at the higher speed. It is a 45psi pump.
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That looks like the same style pump I'm going to use
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