FD4 - Fuel Injector Cleaning and Leakage Check

WARNING: Fuel in the fuel system remains under high pressure even when the engine is not running. To avoid injury or fire, release the fuel pressure from the fuel system before disconnecting any fuel line.

To release fuel pressure, refer to Service and Repair/Fuel System Pressure Relief Procedure.

^ Use the Rotunda Fuel Injector Tester/Cleaner 113-0001A, or equivalent, and accompanying instructions to clean the fuel injectors.

FD4 - Injector Cleaning And Leakage:

^ With the fuel injector tester/cleaner still installed on the fuel system, note any significant pressure loss due to injector leakage when the tester pump is turned to "OFF".

^ Check each fuel injector individually for leakage as required, using the injector bench tester and the fuel injector bench testing procedure associated with the fuel injector tester/cleaner. Verify that each injector leakage rate is within specification (1 drop in 2 minutes maximum).

NOTE: This procedure does not require the matching of injector color with flow gauge band color on the Fuel Injector Tester/Cleaner.

^ Is the leakage rate for individual injectors within specifications?

YES -- See Diagnosis By Symptom. Symptom Related Diagnostic Procedures

NO -- Replace faulty fuel injectors as required.