vented gas cap for '56

[1project2many]

Yes, I have a pump inside the tank. It was my first ever EFI retrofit and I missed a couple of important details. The first is that carburetor tanks often don't have baffles because the carburetor has a fuel well to supply fuel if the pump temporarily fails to supply fuel. The second is that fuel returning from the tank is warmed up and vaporizes easier. My second retrofit, in a '67 Chevelle, adapted a marine system which employed the mechanical pump on the block supplying fuel to a reservoir with a high pressure pump. This system worked well and required a minimum amount of adaptation.

The FITech system is similar to the marine system and should not require a high level of concern for vapor buildup in the tank. Be sure to place your high pressure supply pump where it will not become overheated, away from exhaust manifolds and air coming through the radiator, and consider a cooler on the return line. The shortcoming of a short system is that may have no way to shed excess heat.

I might have some photos of my tank and sender. I built it in '92 so the pictures are real photos and will need to be scanned. I did have the sending unit out in 2012 or 2013 and I *think* I might have taken some digital shots. Maybe I can locate those as well as they will show the baffle I added to reduce pump starvation.

You may want to remove the stock sender and replace the 5/16" steel line with 3/8" line to ensure plenty of fuel available to your engine.