I have a 1970 Monte Carlo SS 454. It's an original build sheet car, fully restored—except for the engine. It now has a beefed-up 454 that tends to vapor lock when idling in Florida heat and traffic for extended periods.
To help with this, I added a return line and a return-style fuel filter, which improved things somewhat. I was also advised to install a quality Holley fuel pump and regulator with a bypass. The issue is, no one mentioned that the bypass regulator requires a 3/8-inch return line, but my car only has a 1/4-inch return line running back to the tank.
So here’s my question:
Does anyone know where I can get a fuel tank sending unit with a 3/8-inch return line that fits a 1970 Monte Carlo SS tank?
Or alternatively, can I safely use one of the existing fuel tank vent lines as a return?
Any advice or ideas would be greatly appreciated.