Fuel Line Sizing

[86Cutlass383SR]

First I'd like to say I have done some searching on this and didn't quite find an application simular enough to mine to get a definative answer. Most are running a lot more HP than I'll ever be at.

Hopefully this weekend I'll start getting my tank in the 86 Cutlass swapped out and get some fuel lines ran. I'm running a 4.3l Monte Carlo baffled tank setup with a Cutlass neck and the stock 4.3 in-tank pump replaced with a 255 Walbro f-body pump. Stock lines sizes are 3/8" main, 5/16" return, and 1/4" vent.

My injection unit is a stock-type 89 TPI with Accel SuperRam plenum/runners and the matching Accel base. 30# SVO injectors and a Holley adj press regulator will be added. The stock sized lines for the TPI will be retained.

The engine all this will be hooked to will be a 383 for mainly daily driving and of course some *spirited* playing. Estimated engine output will be slightly under the 500hp/500 tq (flywheel) range. No nitrous or power adder will be run.

Now for my question. Since I'm completely replacing the main, return, and vent lines in this car should I install the stock size 3/8", 5/16", 1/4" lines or move up to 3/8" for both the main and return? I'd like to just do this once and not have to worry about sizing and pressure issues later.

Thanks