Fuel Pressure Test

WARNING: This page is about a different car, the 2009 Acura MDX, 2008 Acura MDX, and 2007 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

Special Tools Required

Fuel pressure gauge 07406-004000B
Fuel pressure gauge attachment set 07AAJ-S6MA150

Relieve the fuel pressure (see FUEL PRESSURE RELIEVING ).
Disconnect the quick-connect fitting. Attach the fuel pressure gauge set and the fuel pressure gauge.

Fig 1: Identifying Fuel Pressure Gauge Set And Fuel Pressure Gauge
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Start the engine, and let it idle.
- If the engine starts, go to step 5.
- If the engine does not start, go to step 4.
Check to see if the fuel pump is running: Listen to the fuel filler port with the fuel fill cap removed. The fuel pump should run for 2 seconds when the ignition switch is first turned on.
- If the pump runs, go to step 5.
- If the pump does not run, refer to the DTC troubleshooting (see DTC P0627: Fuel Pump Control Module System Malfunction ).
Read the fuel pressure gauge. The pressure should be 390-440 kPa (4.0-4.5 kgf/cm² , 57-64 psi).
- If the pressure is OK, the test is complete.
- If the pressure is out of specification, replace the fuel pressure regulator (see FUEL PRESSURE REGULATOR REPLACEMENT ) and the fuel filter (see FUEL FILTER REPLACEMENT ), then recheck the fuel pressure.