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Electric fuel pump for carb



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Old 11-04-2009, 03:59 PM   #1
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Electric fuel pump for carb

i have a low pressure fuel pump i want to use for my carbed 454, the mechanical pump has in/out/return and the electric only has in and out. As far as the return line to the tank, do I just use that as a 2nd vent or cap it off??
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Old 11-05-2009, 07:22 AM   #2
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Hmm, I'm not to sure about the carbed stuff. If you have a return line coming out of the carb, I'd route it back to the tank. It doesn't sound like you do though. Seems like I've seen fuel filters w/ a return nipple integrated on them, maybe that would work. Why not just run the mech. pump, they're cheap?
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Old 11-05-2009, 02:59 PM   #3
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with everything how i have it positioned, the mechanical pump is against a crossmember
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Old 11-05-2009, 04:08 PM   #4
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Hmm, hopefully someone w/ more knowledge will chime in, but i'd say that if there is a return line originally setup for the carb, it would be a good idea to maintain it somehow in the system.

What kind of contraption are you putting together anywho?
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Old 11-05-2009, 10:38 PM   #5
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You don't need the return with your electirc pump, plug and forget it. Just watch your pressure you only need 5-7 lbs.
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Old 11-05-2009, 11:44 PM   #6
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I used a Holley electric pump on the Zombie. I had it running into a pressure regulator with a gauge and then to the carb. I dont know how or why but it screwed up the regulator and was flooding the carb. When I redid the fuel system, I used a better regulator and better gauge. I also added in a return line. It worked great after that. BTW, I was told by several people that without a return it can burn up the pump.
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Old 11-06-2009, 05:49 AM   #7
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It depends on the pump - some use the return as a cooling mechanism. Others, like Walbro, design their pumps for dead-head operation.
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Old 11-06-2009, 06:36 AM   #8
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I think you only need a return line on a pump rated over 110 gph.
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Old 11-07-2009, 05:13 PM   #9
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I used a Holley electric pump on the Zombie. I had it running into a pressure regulator with a gauge and then to the carb. I dont know how or why but it screwed up the regulator and was flooding the carb. When I redid the fuel system, I used a better regulator and better gauge. I also added in a return line. It worked great after that. BTW, I was told by several people that without a return it can burn up the pump.
i bought this setup from mitch and did it exactley how he did his on mine and i love the way it works, never have to worry about cooking your pump or blowing your carb seals, it just flows back into the tank
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Old 11-07-2009, 05:50 PM   #10
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Mitch, how did you add the return line?
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Old 11-07-2009, 09:39 PM   #11
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The Barry Grant regulator that I bought had a return port. I added in the AN nipple and ran the hose back to the tank.
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Old 11-08-2009, 11:57 AM   #12
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this may help, the inlet is on the right, return in the middle, and to carb on the left.
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Old 11-08-2009, 03:26 PM   #13
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Thanks, that helps
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Old 11-08-2009, 03:34 PM   #14
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I think i may run this filter setup and see how it goes. My pump is a low pressure carb style electric pump feeding a bone stock 454.
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