Hi!!
Some systems have a Schrader valve that can be used to check pressure from the fuel pump (A Schrader valve is the kind that is found on tire valve stems). Remove the threaded cap from the fuel pressure test port on the fuel rail to find the Schrader valve.
Use a special hose that has a Fuel Pressure Gauge on one end and a schrader valve adaptor on the other. (Available at your autoparts store, AutoZone may have a loaner)
Place a small rag under Schrader valve and attach Fuel Pressure Tester, if gas was spilled on rag, remove it and start vehicle, the pressure should be between 77 - 80 PSI (Pounds per Square Inch). If pressure is lower, replace fuel pump.
If no Schreader valve present, (IMPORTANT: RELIEVE SYSTEM PRESSURE by following the instruccions below) use a fuel supply line adaptor to hook the Fuel Pressure Tester, then loosen the fuel line clamps on the fuel rail, if so equipped.
If these lines have quick-disconnect fitting, (RELIEVE SYSTEM PRESSURE FIRST) grasp the larger collar on the connector and twist in either direction while pulling on the line to remove the fuel supply line.
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Quick disconnect fuel line fittings
Relieving Pressure from Fuel System
A very simple procedure for bleeding pressure from the fuel system is as follows:
- Disconnect the fuel pump electrical connector or remove the fuel pump relay or fuse.
- Crank the engine briefly to drop the fuel pressure or run the engine until it stalls.
GOOD LUCK