Service Procedure: Overview

1. Record the radio presets.

2. Open the hood and protect the fenders with fender covers.

3. Release the fuel pressure as follows:

A. Remove the fuel pump fuse.

B. Start the engine and let it run until the engine stalls. Turn the ignition switch to 'on' and crank the engine several times. This will ensure that no fuel pressure is remaining in the fuel rail. With the key off, reinstall the fuel pump fuse.

C. Connect a suitable high pressure fuel pressure gauge to the engine side of the fuel filter to test the function of the fuel pressure regulator.

NOTE:
If the fuel filter shows any sign of leakage or is not designed for this specific application, the fuel filter must be replaced. Fuel filter requirements for this specific application are:





1. All metal construction. (Infiniti is concerned that a plastic fuel filter may be damaged during hose replacement and any damage may not be easily detected).

2. Flow through design with the inlet and outlet settings aligned on the filters center line.

3. 2.25 in. diameter body and fits the fuel filter holding bracket securely.

NOTE:
If the fuel filter is replaced, the frame-to-filter hose must be replaced. Refer to Injector Connector Kit Installation in this bulletin for the correct part number.

D. Start the engine and read the fuel pressure at idle. Record this reading on the repair order. With the vacuum hose removed, the pressure should be no more than 45 psi. If the pressure rises above 45 psi, you will need to replace the fuel pressure regulator and check fuel return lines for obstructions as outlined later in this procedure.

NOTE:
Damp fuel hoses/fuel pressure regulator may give the impression that the fuel pressure regulator is leaking fuel, however, most incidents are caused by a leaking fuel hose, not the fuel pressure regulator. If the fuel pressure regulator is suspected of leaking, remove the vacuum hose and inspect for fuel in the vacuum hose. Replace the fuel pressure regulator if fuel is found in the vacuum hose.

E. Remove the fuel pump fuse and release the fuel pressure following the procedure in step "3B" in this section.

F. Remove the fuel pressure gauge and reinstall the fuel hose to its original location.

G. DISCONNECT THE NEGATIVE BATTERY CABLE.

NOTE:
Damage to injectors may occur if the battery is left connected while performing this campaign. The injector circuit has battery voltage applied regardless of ignition switch position.