Loss of voltage at the fuel pump?

Did you try the fuel pump relay? There is a ground for the relay at the right rear of the cylinder head. Here is also an oil pressure sensor at the rear of the engine near the distributor and would switch out or bypass. Here are the wiring diagrams for the fuel pump so you can see how the system works and the location of the fuel pump relay. Check out the diagrams (below). Please let us know what happens.