Chevy 5.7L TBI fuel tank venting and return line - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-20-2012, 08:12 AM
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Chevy 5.7L TBI fuel tank venting and return line

Hi,

I'm in the middle of plumbing my 1993 5.7L TBI motor. I am wondering about the return line and tank pressure.
My reason for wanting to maintain tank pressure is to allow fuel to be "forced" into the fuel pump to help maintain constant flow. Does this sound like a reasonable idea? If so, then what is a good pressure to maintain in the tank? The other issue with this maybe that the return line will have to work against pressue, so can this effect flow?
Also, I'm wondering if the return line needs to be extended below fuel level, or can the returning fuel be dumped straight into the tank, above the existing fuel.
I'm using a plastic tank, made for a carburetor setup and an external, in-line pump.

Thanks for your help

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Old 01-20-2012, 11:08 AM
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no pressure in the tank, set it up like the factory did, the fuel pump will pump the fuel without help, the fuel can just dump into the tank
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Old 01-20-2012, 04:00 PM
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Thanks for your help.
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