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Old 03-19-2012, 03:38 AM
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Does a fuel return help with a carbureted engine

Greetings all,

I have a question about the fuel system on my olds 455 motor. I bought a mechanical fuel pump when I started my engine rebuild and did not realize the model of pump I bought had a fuel return. My initial thoughts were to go back to Summit and see if I could swap for the mechanical pump without a fuel return, but now I wondering if it is a good idea to run a return. I know its needed for EFI systems to regulate the pressure, but I'm running a 600 CFM Holley carb and I don't know if it will help me or not. Would it help in situations going from heavy throttle to idle to keep the carb from flooding? If i do run a return, my thoughts are to use a flexible fuel line and ziptie it to my hard line going back to the tank. Any suggestions out there?


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Old 03-19-2012, 05:49 AM's Avatar
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Plug the return at the pump and run it. The return on these engines was only for emissions.. These enfines were run with no returns untill the early seventies without problems..
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Old 03-19-2012, 06:03 AM
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Mine runs great without it. That Holley may be a bit small for a 455 IMO.
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Old 03-19-2012, 04:47 PM
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The main reason I have seen folks use the return is that it often helps prevent vapor lock in hot weather. When the pump is delivering too much fuel it is returned to the tank, which cools the fuel down as it flows through the metal line.

I live in central Texas, so summer heat is a problem. You may not have the same issues.

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