Thread: Fuel lines

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Hey Guys Looking to start running my fuel lines on my 32 3 window. I have a 350 with 3 x2 barrels. My question is what size fuel line should i use ? Would 1/4 inch be fine or 3/8 line ?

I would use 3/8" at least.

hard to beat 3/8

It would (MAYBE) work with 5/16 line but there would be no savings with 5/16 as apposed to 3/8. You can't go too big.

3/8" works for almost any road driven car (even 5/16" will work in probably 99% - but it doesn't allow for engine upgrades)

3/8 is my choice.

I don't want anything under 3/8 and if I plumb a car I use 1/2 ss with .035 wall

Originally Posted by jerry clayton

I don't want anything under 3/8 and if I plumb a car I use 1/2 ss with .035 wall

Jerry - wont you run into pressure trouble with a 1/2" and a standard mechanicl type fuel pump? Most only have a 1/4" inlet/outlet and a few at 3/8".

Once you have tubing large enough to satisfy the engine, going to a larger size has no effect on pressure - assuming there's no air in the line.

Dave
there is a differance in TUBE (od) and PIPE (id) sizes

The sizes you refer to are NPT pipe threads and are standard sizes for AN or compression fittings to tube sizes.

A 1/2 od tube with .035 wall thickness is .430 id or just under 7/16. A 3/8 od tube with .035 wall is just .305 id which I feel is small for most any performance engine

Jerry

3/8 should work fine. for race stuff or hp street AN 10 but he is not building any thing with hi hp???? hell i ran mid 12s with 1/8 npt out of the 50 chevy tank

I use 3/8" for road cars and larger for race cars