Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2024 Infiniti QX55 EssentialFACTORY OEM SERVICE PROCEDURE
Work Procedure
FUEL PRESSURE RELEASE
- FUEL PRESSURE RELEASE
With CONSULT
- Turn ignition switch ON.
- Perform "ENGINE" in "WORK SUPPORT" mode with CONSULT.
- Start the engine.
- After engine stalls, crank it two or three times to release all fuel pressure.
- Turn ignition switch OFF.
Without CONSULT
- Remove fuel pump fuse located in IPDM E/R.
- Start the engine.
- After engine stalls, crank it two or three times to release all fuel pressure.
- Turn ignition switch OFF.
- Reinstall fuel pump fuse after servicing fuel system.
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INSPECTION END
FUEL PRESSURE CHECK
- FUEL PRESSURE CHECK
- Release fuel pressure.
- Connect fuel hose for fuel pressure check (B) to fuel pressure gauge (A). Then, connect fuel hose for fuel pressure check to fuel tube adapter (SST: KV10120000) (D) with hose clamp (C).
: To high pressure fuel pump : To quick connector CAUTION:- Use suitable fuel hose for fuel pressure check (genuine NISSAN fuel hose)
- To avoid unnecessary force or tension to hose, use moderately long fuel hose for fuel pressure check.
- Wipe off oil or dirt from hose insertion part using cloth moistened with gasoline.
- Apply proper amount of gasoline on the hose insertion part.
- Use NISSAN genuine hose clamp (part number: 16439 N4710 or 16439 N4710)
- Install hose clamp to the hose end position within 1- 2 mm (0.04 - 0.08 in) and tighten hose clamp to the specified torque.
Tightening torque: 1 - 1.5 N.m (0.1 - 0.15 kg-m) - Disconnect quick connector and disconnect fuel feed hose from high pressure fuel pump. Refer to Exploded View
.CAUTION:
- Make sure to release fuel pressure before removal of fuel line.
- Do the following procedure in the place where ventilation is good without the combustible.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
