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Dieseljunky2, Ford Mechanic
Category: Ford
Satisfied Customers: 3946
Experience:  ASE Certified, Ford Certified, Cummins Certified, & 20+ years in field experience
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1989 Ford: 7.3 Diesel..the fuel filter..injectors..fuel pump

Customer Question

I have a 1989 Ford 7.3 Diesel that has fuel going to the fuel filter but not at the injectors. is there a way to check for air in the lines or anything i should look for before i replace the high pressure fuel pump??
Submitted: 6 years ago.
Category: Ford
Expert:  Dieseljunky2 replied 6 years ago.

Dieseljunky2 :

If you have 12 volts on both wires to the top of the pump, then check to make sure the pump is turning by removing the oil filler in front of the pump and crank the engine while watching the gear. If you have voltage and it is turning, disconnect the injector lines at the injectors. If there is no fuel coming out while cranking, then the high pressure pump is failed. Thanks

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Customer: replied 6 years ago.
i'm in the middle of replacing the high pressure pump. is this suppose to be timed when i put it back in? i didnt know if the gears were suppose to line up a certain way.
Expert:  Dieseljunky2 replied 6 years ago.
Did you take the gear off with the pump and upper gear housing? That is not how it was to be removed. The gear and housing were suppose to stay on the truck, and the 3 small bolts that hold the gear on the pump shaft were to be removed. Let me know how you took the old one off. Thanks
Customer: replied 6 years ago.
yeah i screwed up. i took the gear and the housing off. how screwed am i?
Expert:  Dieseljunky2 replied 6 years ago.

Take the plate off the front of the shaft housing and then take the bolts out the gear. You will have to line up the gear marks to the camshaft gear and put the housing back on before you put the pump back on. Once the gear is back on and the housing is installed, the pump shaft will only fit in the gear one way. Then you line up the 2 scribe marks on the pump mounting flange and gear housing to time the pump. Be careful that you line up the correct mark on the camshaft gear, as the pump gear will have either a square or circle on it, the cam gear has 2 different marks as well, one for the crankshaft gear and the other for the pump. Just make sure the pump gear mark and the cam gear mark are the same and line them up.


Expert:  Dieseljunky2 replied 6 years ago.