Nissan Sentra Service Manual: Fuel pressure
Work Procedure
FUEL PRESSURE RELEASE
1.FUEL PRESSURE RELEASE
With CONSULT
- Turn ignition switch ON.
- Perform “FUEL PRESSURE RELEASE” in “WORK SUPPORT” mode of “ENGINE” using
CONSULT
- Start 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 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.
>> END
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 sealability with O-rings 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 this models do not have fuel return
system.
1.FUEL PRESSURE CHECK
- Release fuel pressure to zero.
- Prepare fuel hose for fuel pressure check (B) and fuel tube
adapter [SST: KV1011840] (D), then connect fuel pressure
gauge (A).
To quick connector
To fuel tube
Clamp

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.
- Remove fuel hose.
CAUTION:
Do not twist or kink fuel hose because it is plastic hose.
- Connect fuel hose for fuel pressure check
to fuel tube
with
clamp
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 and No. 1 spool .
- 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.
Tightening
torque:
1 - 1.5 NВ·m (0.1 - 0.15 kg-m, 9 - 13 in-lb)
- Install hose clamp to the position within 1 - 2 mm (0.04 - 0.08 in).
- Make sure that clamp screw does not contact adjacent parts.
- Connect fuel tube adapter to quick connector.
A :Fuel pressure gauge
B :Fuel hose for fuel pressure check

After connecting fuel hose for fuel pressure check, pull the hose
with a force of approximately 98 N (10 kg, 22 lb) to confirm high
pressure fuel pump does not come off.
- Turn ignition switch ON and check for fuel leakage.
- Start engine and check for fuel leakage.
- Read the indication of fuel pressure gauge.
CAUTION:
At idling : Approximately 350 kPa (3.5 bar, 3.57 kg/cm2, 51 psi)
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
2.CHECK FUEL HOSES
Check the following.
- Fuel hoses for clogging
- Fuel filter for clogging
- Fuel pump
- Fuel pressure regulator for clogging
Is the inspection result normal?
YES >> Replace fuel pressure regulator.
NO >> Repair or replace error-detected parts.
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