Dave mentioned fuses. The fuel pump fuse is prone to running hot. If you are unlucky enough to have a plastic bodied fuse in that position the head causes the plastic to compress. That reduces the contact pressure and can lead to arcing, which makes the problem worse. Can make the fuel pump relay work intermittently. Real ceramic fuses are the best but can be hard to find now days. The plastic ones are good replicas and work OK in normal situations but don't like getting hot. Test the fuse body with a knife or safety razor blade and replace if needed. If your car has a "count the lights" computer, there are actually two, give them a try and see if there are any stored faults. You should be able to find a fault list on the net.