Grand Cherokee 4WD V8-4.7L VIN N (2000)
Technical Service Bulletin # 14-06-00
Date: 000601
Engine/Fuel Pump - Abnormally long Crank Time
Number: 14-06-00
Group: Fuel
Date: August 18, 2000
Subject:
Longer Than Normal Engine Crank Time Prior To Engine Start
Overview:
This bulletin involves the repair or the replacement of the fuel pump module.
Models:
1999-2000 (WJ) Grand Cherokee
Note:
This Bulletin Applies To Vehicles Equipped With A Gasoline Engine Built Before May 26, 2000 (MDH 0526XX).
SYMPTOM/CONDITION:
The customer may experience a longer than normal engine cranking time prior to engine start. The engine cranking time may gradually become worse.
This condition may be due to low initial fuel pressure at the time of engine crank. The low fuel pressure may be caused by a worn o-ring (quad ring) in
the fuel module assembly or by plastic contaminant entering the fuel pump.
DIAGNOSIS:
1.
If the fuel system is suspected as the possible cause of the condition, then preform TSB 14-05-99 (Fuel System Pressure Diagnosis Procedure).
2.
Verify that the fuel system pressure drops more than 207 kPA (30 psi) in less than five (5) minutes. If not, then the long crank time may not be due
to the fuel system and the rest of the engine system must be diagnosed.
