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Stanadyne DBGFC injector problems

A

Anonymous-0

Well-known Member
A friend has a compressor equipped with a Stanadyne injector pump. It starts readily, runs about 2 seconds and dies. It did this about two years ago and a diesel mechanic questioned if you open the bleed screw on the pump housing, will it run? It then ran. The mechanic said "...remove the pump and bring it to me..." my friend did so and the pump was serviced for $485, after reinstallation, the engine ran well. Now after about two years with approximately 20 hours running time it is doing the same thing. What is likely to be causing this? Any suggestions will be appreciated.
Jim
 
Find out what the mechanic did to it. I think you got took. I would suspect a bad governor ring and they did not change it. There is no bleed screw per say on that pump.
 
Disconnect the fuel return line at the pump. If the motor runs ok with this line off then the line is plugged. O-rings in the pump can deteriorate over time and the debris goes back to the tank. If the debris accumulates at an elbow, splice, or check valve it can plug the line. An engine with this pump will not run if pressure starts to build in the return line.
 
Thanks for your reply.
In referring to a drawing of the pump, the plug that was loosened is the referred to as the HEAD LOCKING SCREW. When this is loosened, the engine runs.
 
could be the pump return line fitting or line is plugged.loosening a head locking bolt might relieve a resulting to high internal housing pressure.
 

I agree with bison as there's a glass check ball in the return line fitting on inj pump that can get plugged causing too much pressure inside inj pump that can keep it from pumping fuel very long.
 
The glass check-ball mentioned is the "housing pressure regulator valve." Maintes a housing PSi round 3-4 PSI. It causes your symptoms when plugged with debris - usually from a failed plastic dampener ring inside the pump.

I never put the new plastic back in. $45 buys you and upgraded solid-metal drive. So, in the hands of somebody with experience . . on the bench . . . it's a two hour job to fix the pump, and about $75 in new parts (including the upgrade).
 
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