The above pressure test, while valid, only verified the fuel system s ability to deliver fuel under low-demand conditions.

Most pressure testers connect to the radiator cap inlet and can be done with the engine cold. Verify what your vehicle’s pressure is supposed to be and monitor the gauge with the vehicle running.

First, check the fuel pressure with a fuel pressure gauge. If there is no pressure, you likely have an issue involving the fuel pump.

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If this significantly helps, fuel pressure is bleeding down. This can be confirmed by attaching a fuel pressure gauge to the test port on the fuel rail.

Some vehicles (GM and Ford in particular) have convenient fuel system test fittings, allowing connection to a reasonably priced auto parts store fuel pressure gauge.