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Fuel lines

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Old 06-19-2017, 11:33 AM   #1
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Fuel lines

Hey everyone.

Swapping to LS from carbed car. Years back I had already swapped my barbed hose ends for the AN compression fittings and they never leaked. These are the ones with the copper compression fitting in them that tightens down over the tube.

Will these work with the higher pressure the LS requires for FI or do I need to swap them out?

Fuel pump is wahlboro 255. Installed it about 10 years ago when I went to the compression fittings during my last engine swap. I swapped my 305 for a 355 and got rid of my mechanical fuel pump. now the 355 is going for the LS.

Link here and picture below.

Russel AN compression fitting




Last edited by Ozz1967; 06-19-2017 at 12:54 PM.
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Old 06-19-2017, 03:20 PM   #2
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Re: Fuel lines

Those are only good for 50 psi max.
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Old 07-03-2017, 01:01 AM   #3
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Re: Fuel lines

Im using them..and have been using them for over 10+yrs. with my old 255 walbro to now my 450.I know they say its rated for 50psi max..i think thats underrated.Not a single failure here and my car sees winter..salts etc.Ive resused them when i swapped everything from my old transam to this current car.

You could get away with using the compression copper fittings,or spend a bit more time and flare the hardline for AN fittings.I will say the first engine swap i did..i flared the hardlines to put a tpi motor in a carbed car.those fittings did break on me 2yrs later.Ive been using the copper style since.
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Old 07-03-2017, 09:17 AM   #4
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Re: Fuel lines

They probably have a "safety cushion" built in and 50psi is their "rated" limit. What what their actual max is.
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Old 07-03-2017, 10:47 AM   #5
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Re: Fuel lines

If you are going to flare hard metal/stainless lines for an AN fitting you need to buy a 37* flaring tool. Yes it sucks that they are 2/3/5 times as expensive as normal flaring tools! If you are just flaring aluminum line you can get away with a regular flaring tool since the aluminum is soft and will easily form around the new fitting but don't expect that from a hard metal line.
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