Anybody have any advice on how to keep fuel from percolating? I run a Carter mechanical fuel pump right now (440), with a 3/8" stock replacement steel line from the tank to the frame rail in the engine compartment, then I've got it going through about a 12" section of 3/8 rubber hose to the fuel pump, then through AN-6 fittings and braided lines from there through the clear flow-through fuel filter to the carbs. It doesn't take running the engine for long at all before some pretty major stumbling occurs as you rev the engine in the lower RPMs. Only when you get it up to 2500 or above and rev it from there does it not stumble. And on a hot day (like it is here today - 100+ outside), it's really bad. It has still been hot-starting OK for me though; takes a little longer than usual, but eventually goes.
I've got metallic insulating wrap around the metal line portion where it gets within a few inches of the headers, and I use 1/2" phenolic spacers under the carbs. Plus the carbs are on a tunnel ram and stick out above the hood line and get plenty of air flow around them. But I think I'm getting some major fuel percolation in the lines and am trying to figure out a way to maybe re-route the line. As it is now, the line between the pump and carbs is too hot to touch after the engine has been running awhile and I know that's no good. Is it time to go to an electric pump? I thought about one of those old school fuel line ice coolers, but that's really not an option for the mainly street driving that I do now.
I've got metallic insulating wrap around the metal line portion where it gets within a few inches of the headers, and I use 1/2" phenolic spacers under the carbs. Plus the carbs are on a tunnel ram and stick out above the hood line and get plenty of air flow around them. But I think I'm getting some major fuel percolation in the lines and am trying to figure out a way to maybe re-route the line. As it is now, the line between the pump and carbs is too hot to touch after the engine has been running awhile and I know that's no good. Is it time to go to an electric pump? I thought about one of those old school fuel line ice coolers, but that's really not an option for the mainly street driving that I do now.
