No, the line was nylon braid. Interesting. I have the original fuel line from the tank to the pump on my 68. I also have 464 cid, have run the thing to 7,000 rpm and have not run out of fuel in the 800 cfm carb. I had a problem with fuel starvation when the engine was still 428 cid. I put a fuel pressure gauge in and I was losing pressure at about 6000 rpm while going up a long incline. I replaced the fuel pump and have not had a problem since. (Thank you to the folks who suggested the gauge) Is the robbmc pump mechanical or electric ? Do you have a return line or just the feed line? I'm a fan of bigger, if I replaced my line it would be larger, can't hurt.
Robbmc pumps are mechanical, and they make two for the Pontiac, one that pumps up to 550 HP and the other to 1000 HP. They actually state to use a 1/2 / -8AN line for anything over 450 HP. I am not sure what my top HP will be right now, but it will for sure be over 500HP so that why I want to make sure I go with something big enough to handle what I throw at it and not have to go back and redo the system. Is your carb a duel feed carb? I know the one I have is biut not sure if that will have anything to do with it or not.
