Gas line size

[THEFERMANATOR]

5/16" line is margianal, but if your engine is wired properly you should have an alrm go if for excess fuel restriction. It would go off it the smaller line was a problem. It won't hurt to go up to 3/8" line. If the line was your problem though, it would rev up and then die down as it ran out of fuel, it wouldn't be that way all the time. 3/8" line flow alot of fuel. I know I set-up a buddies boat with dual 100 gallon tanks and a pair of 225 EVINRUDES on the back, and put in a 3 valve manifold set-up in the back. I could go full power on BOTH engines pulling through 1 fuel seperator and the single 3/8" line. It was marine grade line though, so it doesn't collapse like the cheaper auto grade line will under vacuum. So if I could run 450HP off of 1 3/8" line, I would venture to say that a 5/16" line would probably feed 150 HP.