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Author Topic: Carburetor Fuel Pump Pressure?  (Read 848 times)

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Dan_Lockwood

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Carburetor Fuel Pump Pressure?
« on: November 05, 2022, 12:32:46 PM »

I will have an application coming up that will require a fuel pump as the tank will be below the carb.

The carb I have is a new Ultima R2, S&S Super E clone.  This will be in my Harley powered MG M-Type replica car.  The tank will be behind the seats and below the carb up front of the car.

I've read that motorcycle carbs do not like high psi.  I was thinking of a fuel pump in the 2-4psi range, but just wanted to ask the question.  I know that sometime someone here has had to run a fuel pump.

Any help would be greatly appreciated, Thanks!

Dan
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Dan

2009 SERG Orange / Black
Board Track Racer Project, Ultima 113"/6spd
2021 Coleman UT400 Side By Side

Finster101

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Re: Carburetor Fuel Pump Pressure?
« Reply #1 on: November 05, 2022, 01:07:41 PM »

I'm more of an automotive tech but we used to run 3 to 5 pounds on them.  I would think the 2-4 that you are looking at would be fine.  Volume is generally more important than pressure on a carb.
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Dan_Lockwood

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Re: Carburetor Fuel Pump Pressure?
« Reply #2 on: November 07, 2022, 12:07:46 PM »

I'm more of an automotive tech but we used to run 3 to 5 pounds on them.  I would think the 2-4 that you are looking at would be fine.  Volume is generally more important than pressure on a carb.

Thanks!

I don't think I'll use nearly as much gas as the 1.5 to 4 psi pumps put out, 20 to 28 gph.  I just don't want to overpower the needle/seat and flood all the time.  Most motorcycle carbs are used with gravity feed on the gas, so basically maybe 1 psi?

Thanks again and I'll keep you all informed on my project.

Have a great week!!!

Dan
« Last Edit: November 14, 2022, 02:45:27 PM by Dan_Lockwood »
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Dan

2009 SERG Orange / Black
Board Track Racer Project, Ultima 113"/6spd
2021 Coleman UT400 Side By Side
 

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