Toyota
Nissan Versa
 Sedan Service Manual
Engine » Engine control system (EC)
Fuel pressure check

Work Procedure

FUEL PRESSURE RELEASE

1.FUEL PRESSURE RELEASE

With CONSULT

  1. Turn ignition switch ON.
  2. Perform "FUEL PRESSURE RELEASE" in "WORK SUPPORT" mode with CONSULT.
  3. Start engine.
  4. After engine stalls, crank it two or three times to release all fuel pressure.
  5. Turn ignition switch OFF.

Without CONSULT

  1. Remove fuel pump fuse located in IPDM E/R.
  2. Start engine.
  3. After engine stalls, crank it two or three times to release all fuel pressure.
  4. Turn ignition switch OFF.
  5. Reinstall fuel pump fuse after servicing fuel system.

>> INSPECTION END

FUEL PRESSURE CHECK

1.FUEL PRESSURE CHECK

CAUTION:

  • Before disconnecting fuel line, release fuel pressure from fuel line to eliminate danger.
  • The fuel hose connection method used when taking fuel pressure check must not be used for other purposes.
  • Be careful not to scratch or put debris around connection area when servicing, so that the quick connector maintains seal ability with Orings inside.
  • Do not perform fuel pressure check with electrical systems operating (i.e. lights, rear defogger, A/C, etc.) Fuel pressure gauge may indicate false readings due to varying engine load and changes in manifold vacuum.

NOTE: Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel pressure cannot be completely released because N17 models do not have fuel return system.

  1. Release fuel pressure to zero.
  2. Prepare fuel hose for fuel pressure check (B) and fuel tube adapter [SST: KV10118400 or KV10120000] (D), then connect fuel pressure gauge (A).

To quick connector

   To fuel tube (engine side)

    C : Hose clamp

FUEL PRESSURE CHECK

CAUTION:

  • Use suitable fuel hose for fuel pressure check (genuine NISSAN fuel hose without quick connector).

  • To avoid unnecessary force or tension to hose, use moderately long fuel hose for fuel pressure check.

  • Do not use the fuel hose for checking fuel pressure with damage or cracks on it.

  • Use Pressure Gauge to check fuel pressure.

    3.   Remove fuel hose.

CAUTION: Do not twist or kink fuel hose because it is plastic hose.

    4.   Connect fuel hose for fuel pressure check (1) to fuel tube (engine side) with clamp (2) as shown in the figure.

5 : No.2 spool

CAUTION:

  • Wipe off oil or dirt from hose insertion part using cloth moistened with gasoline.
  • Apply proper amount of gasoline between top of the fuel tube (3) and No.1 spool (4).
  • Insert fuel hose for fuel pressure check until it touches the No.1 spool on fuel tube.
  • Use NISSAN genuine hose clamp (part number: 16439 N4710 or 16439 40U00).
  • When reconnecting fuel line, always use new clamps.
  • Use a torque driver to tighten clamps.
  • Install hose clamp to the position within 1 2 mm (0.04 0.08 in).

FUEL PRESSURE CHECK

Tightening torque : 1 1.5 N*m (0.1 0.15 kgm, 9 13 inlb)

  • Make sure that clamp screw does not contact adjacent parts.

    5.   Connect fuel tube adapter to quick connector (1).

A : Fuel pressure gauge

    6.   After connecting fuel hose for fuel pressure check, pull the hose with a force of approximately 98 N (10 kg, 22 lb) to confirm fuel tube does not come off.

    7.   Turn ignition switch ON and check for fuel leakage.

    8.   Start engine and check for fuel leakage.

    9.   Read the indication of fuel pressure gauge.

CAUTION:

  • Do not perform fuel pressure check with system operating.

    Fuel pressure gauge may indicate false readings.

  • During fuel pressure check, confirm for fuel leakage from fuel connection every 3 minutes.

FUEL PRESSURE CHECK

At idling : Approximately 350 kPa (3.57 kg/cm2, 51 psi)

Is the inspection result normal?

YES >> INSPECTION END

NO >> GO TO 2.

2.CHECK FUEL HOSE AND FUEL TUBE

If result is unsatisfactory, check fuel hoses and fuel tubes for clogging.

Is the inspection result normal?

YES >> Replace "fuel filter and fuel pump assembly".

NO >> Repair or replace.

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