Suburban 1/2 Ton 2WD V8-5.3L VIN T (2004)
Fuel Pump Pickup Filter: All Technical Service Bulletins
Fuel System (Flex Fuel) - No Start/Poor Performance
Bulletin No.: 04-06-04-012C
Date: March 03, 2006
TECHNICAL
Subject:
Vehicle With Flexible Fuel E85 (RPO L59) Will Not Start, Loss of Power, Poor Performance and/or Fuel Gauge Reads Inaccurate/Incorrect (Replace
Fuel Pump Strainers AND/OR Redesigned Fuel Level Sensor)
Models:
2002-2004 Cadillac Escalade
2002-2004 Chevrolet Suburban, Tahoe
2002-2004 GMC Yukon, Yukon XL
with 5.3L V8 MFI Engine and Flexible Fuel E85 (VIN Z - RPO L59)
Supercede:
This bulletin is being revised to announce the availability of a fuel strainer kit. The release of this kit allows the technician to replace the fuel strainers
without replacing the entire fuel module. Please discard Corporate Bulletin Number 04-06-04-012B (Section 06 - Engine/Propulsion System).
Condition
Some customers may comment that the vehicle may not start, experience lack of power and/or driveability concerns.
Some customers may comment that the vehicle appears to be out of fuel but the fuel gauge reads above empty.
Cause
There are two possible causes for this condition:
Important:
^
The first possible cause is contaminates in the fuel may plug/restrict the fuel strainer on the bottom of the fuel module.
^
The second possible cause is that the vehicle is actually out of fuel but the fuel gauge reads that there is sufficient fuel in the tank . This condition
is caused by contaminates on the fuel sender card, causing inaccurate fuel gauge readings.
Correction
Follow the service procedure below for diagnosis and correction of these conditions.
Important:
The fuel level sensor may be sending the fuel gauge false readings.
1.
Confirm that there is actually fuel in the fuel tank. DO NOT use the fuel gauge to confirm fuel tank level.
^
If the vehicle has fuel in the fuel tank and the vehicle is experiencing driveability concerns or a no start, refer to Engine Cranks but Does Not
Run. If the above diagnosis procedure leads you to a low fuel pressure condition with a Flexible Fuel (L59) Engine, the most likely cause is a
restricted fuel strainer. Continue with step 2.
^
If the vehicle does not have fuel in the fuel tank and the fuel gauge reads above empty, refer to Fuel Gage Inaccurate or Inoperative (Single
Tank). If the diagnosis procedure leads you to a faulty fuel level sensor, the most likely cause is a contaminated fuel level sensor. Continue
