58 dodge pickup with a stock tank, 413, mechanical fuel pump. Ran great, had a problem with the fuel tank pressuring when hot and leaking gas out the pickup fitting. Vented the gas cap to resolve it, and now it runs fine when cold, but as soon as it warms up and is driven, the fuel filter runs bone dry. Checked for vacuum leaks on the line from tank to pump, found no loose fittings. Any ideas before I throw in an electric fuel pump?
I just went through this, my thread is probably on page 8 or something by now.
I had similar symptoms. Holley mechanical pump on a 440/493. The car ran great when cool and warm, but once it was fully up to operating temperature, the engine would sputter at WOT and the filter was empty with little spurts bubbling in. I changed to a Carter pump and plumbed in a fuel regulator. The regulator has a bypass that returns gas to the tank at anything over 6.5 psi. This worked for me. The filter stays full now.
During my efforts, I took a cheap Harbor Freight thermal infra-red gun to check temperatures. The fuel line from the regulator to the filter is now 18-20 degrees cooler than before. Previously, the fuel line ran from the pump to the filter.
