Hi new to the forum, I have a 77 280z 4sp sat for 15 years, worked on it every few years because of fuel problem. getting divorced and need the car, had choice keep wife or car chose my z. Initially removed tank had it boiled and lined car still didn't run. Now I have discovered fuel tank is blocked internally, so I installed a new outflow line threw drain plug of tank, blocked existing outflow line. Installed new fuel pump,, changed plugs filter, car started right up and ran rough but ran. Problem is now that after driving a couple miles the car hesitates, backfires some when driving and then doesn't go, and drops to idle, i step on gas idles goes up abit then down to idle. I then turn car off, and restart it a couple minutes later and its fine again for a little bit, replaced pump and get 36 lbspressure, fuel seems to travel throughout lines, I am getting spark,Can it be something electrical, or module, relays? when opening the door on AFM the pump starts. I'm sure more info is needed to diagnose. I've been searching the forums but haven't located answer yet and I have to move the car. Thanks

Aleck

Have you checked the fuel damper and the pressure regulator?

So the tank line was clogged...

Have you taken the time to check the integrity of the rest of the fuel system? There is a small screen on your fuel pump-could be getting clogged. How old is the fuel filter? Could be full of same crud.

Electrical-how are all of your electrical connections?