Econoline E550 V8-7.3L DSL Turbo VIN F (2002)
To measure pump wear, place a straight edge across the pump housing and use a feeler gauge to measure clearance between the inner gear and the
straight edge. A pump with excess gear recession will contribute to hard start issues.
When replacing the pump, the directional marking ("out" or "damper") must face the vibration damper.
If installed correctly there is recess that the vibration damper fits into on the inner gear. If installed incorrectly, the inner gear will cause major damage to
the front cover.
6.) For Hard Start Long Crank or No Start Where The Injector Will Not Buzz Loudly ( Has Background Buzz Only ) When Cold
Some engines have a no start/or long crank to start and the injector have a low background buzz, not a strong normal buzz. After performing the buzz
test multiple times the injector may start to buzz and the engine may start and run fine the rest of the day until the next cold start. Typically, we find that
this is a high mileage vehicle with poor maintenance as far as oil changes are concerned. What is occuring is that the poppet inside the injector is not able
to move freely because of the thick old oil. If an oil change is performed after driving the vehicle and then driven again with new oil the next cold start
the engine may improve.
Note: This concern is related to poor maintenance and extended the oil change intervals. If poor maintenance is the cause, then all 8 injectors will be
affected.
The audible sound heard while performing an injector buzz test is the poppet stopping at the upper and lower seat during actuation.
