Fulltext TSBs

Technical Service Bulletins

TSB
03-21-27
  • FUEL SYSTEM – 7.3L DIRECT INJECTION (DI) TURBO DIESEL – NO RETURN FUEL FLOW TO FUEL TANK – BEGINNING WITH VEHICLES BUILT 2/9/94
  • LOW PERFORMANCE/LACK OF POWER – 7.3L DIRECT INJECTION (DI) TURBO DIESEL – NO RETURN FUEL FLOW TO FUEL TANK – BEGINNING WITH VEHICLES BUILT 2/9/94
Publication Date: October 6, 2003

FORD:
1994-1995 F SUPER DUTY, F-250, F-350
1995 E-350

Article 97-11-18 is being republished in its entirety as part of a consolidated 7.3L diagnostic aid booklet.

ISSUE:

Some vehicles may exhibit a lack of power and/or low performance condition, caused by no return fuel flow to the fuel tank. This condition can be identified while performing the “Air in the Fuel System” test from the Performance Diagnostic Sheet. This is due to a restricted orifice or clogged strainer screen. This TSB article does not apply to 1996 and later vehicles.

ACTION:

Remove the fuel pressure regulator assembly to inspect the return orifice and strainer screen for debris. Refer to the following Service Procedure for details.

SERVICE PROCEDURE

Refer to Figure 1.

  1. Remove fuel filter cap and filter element.
  2. Disconnect the two (2) flexible return fuel hose fittings, fuel bypass hose, and two (2) attaching bolts.
  3. Remove regulator assembly from fuel filter housing, taking care not to damage O-ring which will be used for reinstallation.
  4. Unscrew strainer assembly from regulator.
  5. Remove orifice and check ball from regulator.
  6. Inspect orifice screen (which may remain in filter housing where regulator was removed), orifice, check ball and strainer screen for debris.
  7. Clean any contamination from parts using disc brake cleaner.
  8. Reassemble all components and verify return fuel flow is now present.

OTHER APPLICABLE ARTICLES:

NONE

SUPERSEDES:

97-11-18

WARRANTY STATUS:

Information Only




Figure 1 – Article 03-21-27