Fuel Pressure: Testing and Inspection
Fuel Pressure TestSpecial Tools Required
Fuel pressure gauge 07406-004000A
M/T model:
1. Relieve the fuel pressure.
2. Remove the sealing nut from the fuel rail. Attach the fuel pressure adapter nut, 12 mm (A) and the fuel pressure gauge.
3. Disconnect the vacuum hose (C) from the fuel pressure regulator (D), and pinch it closed with a clamp (E).
4. Start the engine and let it idle.
- If the engine starts, go to step 6.
- If the engine does not start, go to step 5.
5. Check to see if the fuel pump is running: Remove the fuel fill cap, and hold your ear to the fuel fill port while an assistant turns the ignition switch ON (II). You should hear the pump run for about two seconds when the ignition is turned ON (II).
- If the fuel pump runs, make sure there is sufficient fuel in the tank, then go to step 6.
- If the fuel pump does not run, test it.
6. Read the pressure gauge (with the fuel pressure regulator vacuum hose disconnected and clamped). The pressure should be 270 - 320 kPa (2.8 - 3.3 kgf/sq.cm, 40 - 47 psi).
- If the pressure is OK and engine is running, go to step 8. If the engine is not running, repair the cause, then continue this test.
- If the pressure is out of spec, go to step 8.
7. With the engine running, unpinch and reconnect the vacuum hose and read the gauge again. The pressure should be 210 - 260 kPa (2.1 - 2.6 kgf/sq.cm, 30 - 37 psi).
- If the fuel pressure is OK, the test is complete, go to step 9.
- If the pressure is out of spec, go to step 8.
8. Disconnect the vacuum hose from the pressure regulator again while you watch the pressure gauge. The pressure should rise when you disconnect the hose.
- If the pressure did not rise, replace the fuel pressure regulator.
- If the pressure rose, but all your readings were lower than specified, check for a clogged fuel filter and for leaks in the fuel lines.
- If the pressure rose, but all your readings were higher than specified, check for a pinched or clogged fuel return hose or line.
9. Reconnect the vacuum hose, remove the pressure gauge, and reinstall the sealing nut with a new washer. Tighten the sealing nut to 22 N.m (2.2 kgf.m, 16 lbf.ft).
NOTE: Disassemble and clean the fuel pressure gauge attachment thoroughly after use.
CVT model:
1. Relieve the fuel pressure.
2. Remove the sealing nut from the fuel rail. Attach the fuel pressure adapter nut, 12 mm (A) and the fuel pressure gauge (B). Remove the vacuum hose (C) from the fuel pulsation damper (D), and pinch off the hose with a clamp (E).
3. 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.
4. See if the fuel pump is running: listen to the fuel fill 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 fuel pump does not run, perform the fuel pump circuit troubleshooting.
5. Read the pressure gauge. The pressure should be 270 - 320 kPa (2.8 - 3.3 kgf/sq.cm, 40 - 47 psi)
- If the pressure is OK, the test is complete.
- If the pressure is out of specification, replace the fuel pressure regulator and the fuel filter, and recheck the fuel pressure.
6. Remove the pressure gauge, and reinstall the sealing nut with a new washer. Tighten the sealing nut to 22 N.m (2.2 kgf.m, 16 lbf.ft).
NOTE: Disassemble and clean the fuel pressure gauge attachment thoroughly after use.