Proper Fuel line sizing

[Viprklr]

Is 1/4" return large enough for a 340lph pump?

 

[Viprklr]

A little background.
There are unknown modifications done to the car.
It is leaking fuel from on top of the tank.
I just bought this car from my dad, $1.00, who bought it from someone else. History will be hard to acquire.
I'm planning on just replacing the tank pump, sending unit, 100% of the lines.
Do it once, do it right.

I am a NA V8 guy. Had some fun in the turbo world back in 2000.
Sold my TransAm GTA, fully built by me.
This is my new project.

87 GN

 

['87 Turbo "T"]

A little background.
There are unknown modifications done to the car.
It is leaking fuel from on top of the tank.
I just bought this car from my dad, $1.00, who bought it from someone else. History will be hard to acquire.
I'm planning on just replacing the tank pump, sending unit, 100% of the lines.
Do it once, do it right.

I am a NA V8 guy. Had some fun in the turbo world back in 2000.
Sold my TransAm GTA, fully built by me.
This is my new project.

87 GN

Honestly I’d say it’s 50/50. Some h guys have had no issue, some have had issues with fuel pressure/adjustments.

If you’re not going much bigger than stock power, put a 255lph in & be done. As always a Hotwire set-up from Casper’s is ALWAYS a good idea.

I’d leave it parked until you figure out what has been modded & what kind of shape the car is in mechanically.