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650D/WD9/MD etc. injector pump Troubles...HELP!
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Posted by Ron in Nebr on August 19, 2004 at 18:03:40 from (65.172.143.106):
Having a problem with the injector pump on my 650D and hopefully the wisdom on this board can help me figure out the problem.
Basically, I'm getting no pressure, zero, out of the primary pump that bolts to the rear of the main injector pump. I have good fuel flow going into the primary pump, and the screen in the inlet fitting is clean. But when I run the tractor(on gas) with the output line removed from the primary pump, all the fuel I get out of it is just what gravity from the tank flows. No pressure at all. It's almost like the gears in the primary pump aren't even turning.
I've taken the primary pump off, and made sure the pressure valve isn't stuck open, and that the square drive coupling is still attached to the gear shaft like it's supposed to be. Is it possible that the square portion on the rear of the governor shaft that drives the primary pump has rounded or broken off? Or is there something else I'm overlooking here?
If I let the tractor sit for a few days, fuel will work it's way up to the injectors(probably by gravity since the tank's pretty full) and they'll bleed ok and it will switch and run on deisel for awhile, then it just dies from lack of fuel.
Any help or advice would be appreciated!!!
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