Fuel lines

[falco11]

I have a stock 1988 K5 350 in which the fuel lines are severly rusted. A recent leak has started so i'm seeking to replace the lines. Does anyone know what diameter the original lines are and if when replacing, should i use the same diameter or increase the size?

 

[Russell]

3/8 and 5/16

The smaller line is for the return, and the larger for the feed to the TBI.

If your engine is stock, I'd leave them factory size. Most of the fuel that gets sent up to the throttle body winds up going back to the tank down the return line anyways.

 

[falco11]

Thanks for the info.

 

[sweetk30]

dont forget no compresion fittings as thay are ilegal to use in ny state. i know this as i am a inspector. just to save you from doing it again.