Does fuel line size matter THAT much?

92LongBed · Feb 24, 2023

so i bought a return line kit and they were all 1/4” in the kit for my truck so the idiot i am just went ahead and replaced other supply and return lines with 1/4” fuel hose when i found out supply was 3/8” and return was 5/16”, i am wondering if that small mistake in hose size could cause fuel starvation?

hacked89 · Feb 24, 2023

Yea, the size of the line is calculated to be able to move a certain gph under all conditions. If you don’t feel like fixing it you can drive it until you have a problem or not. But your question was, could it cause starvation? Yes.

92LongBed · Feb 24, 2023

hacked89 said:
Yea, the size of the line is calculated to be able to move a certain gph under all conditions. If you don’t feel like fixing it you can drive it until you have a problem or not. But your question was, could it cause starvation? Yes.

okay thanks, i’ll throw in the correct size on the supply side so i don’t screw myself over

Brian VT · Feb 24, 2023

You changed all your caps and return lines to 1/4"?

92LongBed · Feb 24, 2023

Brian VT said:
You changed all your caps and return lines to 1/4"?

i bought the specified kit for my model of 1992 ford which was this,

More Information for DELPHI 7135276

then i installed 1/4" when i replaced my FSV but that is only about 12" of total fuel hose to connect the FSV to the hard lines. then i replaced the return line coming off the back of the motor on driver side with 1/4". ill be replacing the supply line from the hard line to the fuel filter today with 3/8" bc I was at the parts store and got a reply so i picked up the correct supply hose size.

Booyah45828 · Feb 24, 2023

I don't see how you managed to use 1/4 hose on anything on the supply side, as the nipples are all much larger then 1/4" IIRC. That'd be like stretching your ******* over a pie plate unless the hose you used isn't braided/reinforced.

92LongBed · Feb 24, 2023

Booyah45828 said:
I don't see how you managed to use 1/4 hose on anything on the supply side, as the nipples are all much larger then 1/4" IIRC. That'd be like stretching your ******* over a pie plate unless the hose you used isn't braided/reinforced.

funny you mentioned not being braided. this is my first time ever doing fuel line work so i got bamboozled, but all that 1/4” i installed is soaked and seeping diesel lol so i’m going to pick up the right sizes and rightbfuel line. guy ripped me off when i asked for 5’ of 1/4 fuel line hose. glad it was only 15 bucks

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you can see the condensation here. learning as i go!!!

Booyah45828 · Feb 25, 2023

Yeah, that stuff isn't going to work weeping like that. I wonder what material he gave you? Regardless, at 15 bucks it was a cheap lesson.

The braiding not only gives it more strength psi wise, it also helps resist collapsing under vacuum. Gates barricade fuel hose is pretty good stuff, you can typically get it at any parts store by the foot.

Jason1377 · Feb 25, 2023

Booyah45828 said:
Yeah, that stuff isn't going to work weeping like that. I wonder what material he gave you? Regardless, at 15 bucks it was a cheap lesson.

The braiding not only gives it more strength psi wise, it also helps resist collapsing under vacuum. Gates barricade fuel hose is pretty good stuff, you can typically get it at any parts store by the foot.

How much ft wise would a person need curious is all tryin to gather parts for a weendend return line and sendin unit replacement

Booyah45828 · Feb 27, 2023

I'm not sure. 10 foot of each would be plenty to replace all the rubber hoses I would think, so long as you still have the steel lines in place. If you're replacing all the steel and rubber with rubber then you're going to need more.

It's not like the stuff is expensive. I'd rather have too much then not enough to get the job done having to go back to the store for more.

Does fuel line size matter THAT much?

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