2.Fuel Pressure Drop Inspection

a. Installation of pressure gauge

Install a fuel pressure gauge between the fuel filter (high) and the fuel distribution pipe.



b. Checking the fuel pressure drop

1) Run the engine at idle and turn off.
2) Observe the fuel pressure after 15 minutes.
3) If the pressure goes down more than 3 psi (0.2 kg/sq.cm), trace the cause as follows:



2-1 Pressure Regulator Check

a. Plug the outlet of pressure regulator with a cap.

b. Operate the fuel pump by connecting the terminals of the check connector with a jump wire and turning the IG switch to the "ON" position.

c. Stop the fuel pump and observe the fuel pressure after 15 minutes.

If the pressure does not go down, replace the pressure regulator. If it goes down more than 3 psi (0.2 kg/sq.cm), proceed to the next step.



2-2 Fuel Pump Check

a. Connect the pressure gauge as shown.

b. Operate the fuel pump and stop it.

c. Observe the fuel pressure after 10 minutes.

If the pressure goes down more than 6.4 psi (0.45 kg/sq.cm), replace the fuel pump. If the fuel pump is OK, proceed to the next step.



2-3 Fuel Injector Check

a. Secure the primary injectors to the delivery pipe with wire.

CAUTION:
Secure the injectors firmly to the delivery pipe so no movement of the injectors is possible.

WARNING:
Be extremely careful when working with fuel. Always work away from sparks or open flames.

b. Connect a jumper wire to the fuel pump check connector. Turn the ignition switch to the "ON" position.

c. Check that fuel does not leak from the injector nozzles.

NOTE:
After 5 minutes, one drop of fuel leakage from the injector is acceptable.



d. Check for leakage from the secondary injectors in the same manner as the primary injectors.

If the fuel leakage is more than one drop in 5 minutes, replace the leaking injector(s). If it is less than one drop in 5 minutes, proceed to the next step.