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Old December 6th, 2009, 04:33 PM   #1
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Default Electric fuel pump question

I had recently purchased a 79 CJ7 and the previous own had installed a Holly electric fuel pump in it. From looking at how he has it set up, there is no return line back to the tank. From other electric fuel pump set ups I have seen, there has always been a return line. There doesn't seem to be any problems with the operation, so is it necessary to have a return line on electric pumps or not?

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Old December 6th, 2009, 04:35 PM   #2
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no. you don't need one if done properly.
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Old December 6th, 2009, 05:05 PM   #3
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Quote:
Originally Posted by wrifrocks2005 View Post
no. you don't need one if done properly.
I guess my next question would be what is considered done properly?
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Old December 6th, 2009, 06:47 PM   #4
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typically i like to run a return style system because it keeps the pump cooler and it doesn't have to work as hard. you can go without a return line if the pump is low enough pressure or it uses an internal regulator.
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Old December 6th, 2009, 10:25 PM   #5
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the "returnless" systems just return the excess fuel to the inlet side of the pump, essentially, so it doesnt need to return all the way back to the tank, but still does the same basic thing
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Old December 6th, 2009, 10:54 PM   #6
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is it a holley red or blue pump? one is internally regulated for carbed setups and intended to run without return, and the other comes with an adjustable regulator. if you have the red it's already set to 7psi, if the blue it'll run up to 14 and is adjustable. either one doesn't require a return though.

i doubt it's the black since that's a high flow, 1.5x the cost, and overkill for your set up.

if it's a different pump, like one intended for an efi setup that has been regulated down to carbed pressure, i'd get a return style regulator on it or a different pump asap.
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Old December 7th, 2009, 09:04 AM   #7
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Quote:
Originally Posted by jon_xj90 View Post
is it a holley red or blue pump? one is internally regulated for carbed setups and intended to run without return, and the other comes with an adjustable regulator. if you have the red it's already set to 7psi, if the blue it'll run up to 14 and is adjustable. either one doesn't require a return though.

i doubt it's the black since that's a high flow, 1.5x the cost, and overkill for your set up.

if it's a different pump, like one intended for an efi setup that has been regulated down to carbed pressure, i'd get a return style regulator on it or a different pump asap.
From taking a look at it, it appears to be a Red Holley pump
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Old December 7th, 2009, 09:18 AM   #8
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The Holley Red pump does not need a return line or a regulator.
Quote:
no. you don't need one if done properly.
Not sure if you're talking just Holley pumps or what, but some pumps absolutely require a bypass or return setup.
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Old December 7th, 2009, 01:53 PM   #9
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i just assumed it was the red or blue since he specified it was a holley in the first post, and yes some pumps absolutely require a return line.

if it's the red pump it's internally regulated to 7psi and should be fine run the way it is, that's how my chevy is set up and i haven't had a problem in 2 years
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Old December 7th, 2009, 04:03 PM   #10
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Thanks everyone for your help
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