3. Inspect the fuel joint for crack or damage.
4. Connect the fuel joint exit with a vacuum
pressure gauge
.
5. Check whether the negative pressure can be maintained for over 10 minutes under
the prescribed pressure. Replace if necessary.
Prescribed pressure: 50kPa.
FUEL PUMP REMOVAL AND INSPECTION
1. Remove the bolts fixing the fuel pump.
2. Remove the fuel pump.
3. Connect the fuel pump intake with a vacuum
pressure gauge
.
4. Block the exit of fuel pump with finger, and force a prescribed positive pressure to
check for leakage.
Prescribed pressure: 50kPa
5. Force a prescribed negative pressure and check for leakage.
Prescribed pressure: 50kPa
6. Connect the fuel pump exit with a vacuum
pressure gauge
.
7. Force a prescribed negative pressure and check for leakage. Disassemble the
fuel pump to check if necessary.
Prescribed pressure: 50kPa
8. Remove four bolts, and separate fuel pump cover from fuel pump seat.
9. Remove the valve screw bolt from fuel pump, and remove the valve plate.
10. Press the plunger and diaphragm, rotate the fuel pump seat, and align the notch
with the notch on the plunger. Take the roller needle out.
11. Inspect the diaphragm for crack and valve for damage. Replace if necessary.
12. Reverse above step 8 to step 10 to install the fuel pump.
38
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