Ascender 2WD L6-4.2L (2003)
Fuel Filler Neck: All Technical Service Bulletins
Fuel System - Pump Nozzle Shuts OFF/Tank Slow to Fill
TSB SB04-02-S004
Vehicle is Difficult to Fill with Fuel or Filling Station
Pump Shuts Off Before Tank is Full or Fuel Spits
Back/Out When Filling the Tank
Affected Vehicles
2003-2004 Isuzu Ascender (7-Passenger / 5-Passenger) models.
Service Information
This bulletin provides information on two different conditions.
Condition 1:
Some customers may comment that their vehicle is difficult to fill with fuel or when filling, the pump continuously shuts off before the tank is full.
Possible Cause:
This condition may be caused by the variability (fuel flow rates, type of fuel fill nozzle, fuel properties) at the filling stations. There is a potential to
develop an increase in back pressures internal to the fuel fill neck. This back pressure trips the fuel nozzle prior to filling the tank, or results in a hard to
fill condition.
Condition 2:
Some customers may comment that when filling the fuel tank, a small amount of fuel may spit back/out.
Possible Cause:
This condition may be caused by the equalization of pressure between the fuel tank and the fuel fill neck that does not react quickly to the variance in the
pressure when the fueling station fuel nozzle trips off.
Correction:
Replace the fuel tank filler upper pipe assembly and lower hose assembly. The new upper pipe has been redesigned to provide smoother flow conditions
within the section and the new lower hose has been redesigned to include a checking feature. Use the procedure listed below.
Service Procedure
1.
Remove the fuel fill cap.
2.
Remove the fuel fill pipe housing.
3.
Remove the fuel fill pipe bracket nut (see figure 1).
4.
Raise and suitably support the vehicle, refer to Lifting and Jacking the Vehicle in the General Information sub-section of the Service Manual.
5.
Remove the fuel fill pipe ground strap bolt.