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Whole front of the motor for an IP replace? Nope, read the manual. IP rebuild should run you around $500. If diesel don't come out the injector lines with the solenoid pulled in and fuel in and out, you can be sure the IP is a goner. Lots of plastic parts inside that don't last forever.

My recommendation is to pull your pump and have a local reputable injection repair shop rebuild it. They will know exactly how to set it up from the Stanadyne numbers on it. Usually runs around $400 here in Houston.

If you have plenty of pressure on the injector pump inlet, the run solenoid is engaging, and no diesel spurts out of the injector lines, sounds like you may be right about the IP.

Is your start box clicking and voltmeter dipping as the glow plug system cycles? Don't think about replacing the pump until you are sure you are getting glow.

And you are 100% sure the glow plugs are glowing? Make sure all that works right before pulling the injector pump.