Fuel Pressure Test

Special Tools Required

Relieve the fuel pressure (see FUEL PRESSURE RELIEVING ).
Disconnect the vacuum hose (A) from the fuel pressure regulator (B), and pinch it closed with a clamp (C).

Fig 1: Identifying Vacuum Hose And Fuel Pressure Regulator
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Disconnect the quick-connect fitting. Attach the fuel pressure gauge attachment set and the fuel pressure gauge.

Fig 2: Attaching Fuel Pressure Gauge
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Reinstall the intake airduct (airflow tube) (see step 16 under INSTALLATION ).
Start the engine, and let it idle.
- If the engine starts, go to step 7.
- If the engine does not run, go to step 6.
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 7.
- If the pump does not run, refer to the DTC TROUBLESHOOTING .
Read the fuel pressure gauge. The pressure should be 320-370 kPa (3.3-3.8 kgf/cm² , 47-54 psi).
With the engine running, unpinch and reconnect the vacuum hose while you watch the pressure gauge. The pressure should fall when you connected the hose.

If the pressure falls, and the fuel pressure was OK in step 7, the test is complete.
If the pressure did not fall, check the vacuum line between the pressure regulator and the intake manifold. If the line is OK, replace the fuel pressure regulator (see FUEL PRESSURE REGULATOR REPLACEMENT ).
If the pressure falls, but the fuel pressure was lower than specified in step 7, check for a clogged fuel filter (see FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT ), and for leaks in the fuel lines (see FUEL LINE INSPECTION ).
If the pressure falls, but the fuel pressure was higher than specified in step 7, check for a pinched or clogged fuel return hose or line (see FUEL LINE INSPECTION ).