Recommended Procedure:
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- Verify there is fuel in the tank.
- Remove the plug from the front of the engine fuel filter housing. Install High Pressure Pump Test Adapter 303-765 or equivalent and Gauge 0-1.1 MPa (0-160 psi) Bar 014-00761 or equivalent.
- Road test the vehicle at a full load condition.
If pressure fails low, go to step 10b .
If fuel pressure is above specification, check the fuel return lines for a restriction.
If no restriction is present, install a new fuel pressure regulator valve.