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Electric fuel pump

Old 04-28-2021, 06:36 PM
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Default Electric fuel pump

I have a gen6 502 mag mpi that has been converted to a carb 540. The raw water pump doesnít have a fuel pump boss and with the alternator placement, too many brackets would have to be replaced. So I am looking at electric pumps. Either way , I am planning on running a return line to the filler neck as I want to avoid vapor lock and give greater pump longevity. The Weldon a600 to a bypass and then to a regulator is what I have spent some time looking into. The a600 is not uscg approved but I would feel comfortable using it. Thx in advance
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KNOT-RIGHT (04-30-2021)
Old 04-29-2021, 06:52 AM
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A carb will not vapor lock

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Old 04-29-2021, 09:44 AM
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I had a 1975 international scout. 345 4 speed. It begs to differ !
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liberator221 (05-22-2021)
Old 05-21-2021, 02:45 PM
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Last summer I was getting a lean stumble at mid rpms after a few minutes steady speed.
When it happened the AFR would shoot up, and If I throttled back or if it stalled, it would have normal air/ fuel on restart.

I decided to err on the side of caution and plumbed a return fuel system last fall. Kept my Holley Blue Marine pump and opened everything that was undersized to 3/8" ID.
Then in the last few weeks I realized it could have been timing related. I checked my timing in the spring, yup too high. So I set it back to a normal #.

BTW CPPerformance has the return bung setup for your fuel. I started out to make one and found that I would have spent a lot of time and money cause I could not fab up and weld things as I wished

Haven't gone for a ride yet, but she's almost done getting shiny in the yard!

And I have experienced vapor lock on old beat up 1960's American luxo barges when I was a young driver in the early 70's.
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smokediver (05-21-2021)
Old 05-21-2021, 03:35 PM
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Iím using a Weldon A600 and itís an impressive little unit and super quiet compared to the Holley pump that came with my boat. I put rubber boots over the terminals with dialectic grease as it otherwise seems to be sealed up pretty solid. I canít speak to the legality of it not being a USCG approved unit but Iím a fan of it. Jeff Harris uses Weldon pumps on his builds.
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Old 05-21-2021, 08:38 PM
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I ended up running a return line and also picked up the Weldon A600 pump along with their return regulator. I do have 3/8 fuel line , about 4 feet running into a fst fuel water separator and then 1/2 inch for the rest. My return line is also 3/8 running back into the fuel fill.
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