Wagoneer L6-242 4.0L VIN M FI (1988)
Fuel Pressure Regulator: Customer Interest
Engine - No Start Condition At Freezing Temperature
Models
1987-88 Cherokee, Wagoneer, & Comanche With 4.0L Engine
Subject
No-Start Condition At Freezing Temperature
Index
FUEL SYSTEM
Date August 1, 1988
No.
14-51-88
P-3084
(C14-51)
SYMPTOM/CONDITION
Some 1987-88 4.0L Cherokee, Wagoneer and Comanche vehicles may experience a no-start condition due to ice restricting return line fuel flow in the
fuel tank. This condition will occur at freezing temperatures (32~F or below) and when 1 to 3 quarts of water/ice is present in the fuel tank. Excessive
fuel pump noise may also be experienced.
NOTE:
WATER IN FUEL THE TANK IS NOT CONSIDERED A WARRANTY ELIGIBLE REPAIR.
DIAGNOSIS
Remove the vacuum hose from the vacuum port of the fuel pressure regulator and inspect for evidence of fuel. If fuel is present in the vacuum hose or the
regulator vacuum port, replacement of the fuel pressure regulator is required. In addition, if the vehicle has been exposed to freezing temperatures (32~F
or below) prior to the no-start complaint, water contamination in the fuel tank is likely. Proceed with the following repair procedure.
PARTS REQUIRED
Regulator Pressure Kit
PN
83503635
Fuel Filter
PN
33000076
O-Ring, Sending Unit
PN
53000575
REPAIR PROCEDURE
1.
Remove the fuel tank as outlined in repair manual M.R. 244, Page B-157 or M.R. 277, Page B-145. Drain tank of all contaminated fuel. Remove
the fuel sending unit.
