Your "test" will tell you if fuel is flowing but you can do that by cracking loose a fuel line. On the really tough to diagnose cases there is no replacement for having the right equipment. In 99% of the time working on the fuel system a fuel gauge is not required. David Teitelbaum vin 10757 --- In dmcnews@xxxx, Dmcjal@xxxx wrote: > Let me throw a thought out for somebody to shoot down. > > If you do not have a fuel pressure gauge, there is another approach to check > fuel pressure ASSUMING that the pressure regulator is OK. > > Jump the fuel pump relay with the engine off and listen to the fuel return > line. No noise would indicate that fuel is not returning to the tank because > the pump cannot generate enough pressure to open the pressure regulator. > > Should work, no?