[old_master]

Fuel pressure is tested with the engine off and has nothing to do with timing or compression. Fuel pressure must be 60psi to 66psi, key on, engine off, fuel pump running. If pressure is above spec, there is a restriction in the return line. This includes the regulator and the line that runs to the fuel pump module, and the module itself... PERIOD!

The service port for testing the fuel pressure is in a 3/8" steel line at the rear of the intake manifold, next to the distributor. Right next to the service port is a smaller (5/16") steel line. That is the return line. It runs directly to the fuel pump module in the fuel tank. The fitting on the fuel pump module directs the fuel through one of the spring loaded steel tubes into the well that the fuel pump motor mounts in, (this is what cools the fuel pump). Disconnect the return fuel line at the intake manifold. If you blow into the return line, there should be VERY little restriction. If you remove the fuel filler cap, you should be able to hear it blowing bubbles in the tank. If the line is clear, the fuel pressure regulator is the problem.