what size fuel line
03-01-2007, 08:11 PM
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what size fuel line doing a lt1 swap into my 86 monte. i need to know what size fuel line i need to go with so that i can get a sump with the correct sizes. im looking to do about 400ish rwhp. thanks everybody
03-01-2007, 10:36 PM
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If you're going to run all new line and plan on big upgrades in the future, get the sump fitted with at least a 10AN fitting, if not a 12AN fitting. I think I'm going to run a 10AN line for the time being but also putting a 12AN fitting in the tank with a cap on it. That way I can easily drain gas out of the tank, and I can upgrade to the 12AN line if I ever need to and cap the 10AN line then 
03-02-2007, 02:03 AM
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400HP you could get away with a -6 line after the pump but I would suggest a -8 line after the pump and a at least a -10 to go to the pump from the tank, I put a -12 line on mine from the tank to the pump and a -8 to the engine.
03-02-2007, 04:07 AM
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I had a 86 Grand Prix with 383 and Paxton supercharger - ended up running a 1/2" aluminum line for feed and 3/8" line for return. This engine was carbed so I ran an electric inline with boost referenced regulator. Never had any fuel starvation problems.
-Jay-
-Jay-