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Old 12-27-2006, 09:15 PM
Dr Evil's Avatar
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Join Date: Mar 2005
Posts: 6
75 240D Injection pump question

Howdy Folks,
My Benz did a wierd thing, it was running one day and the next it would not start and has not run since. Basically, I have determined that fuel is not being injected out of the pump by removing the injectors and cranking the engine while throttling. I removed the spring, shims and cover of the IP regulator and had an assistent PUSH in the rod at the center of the diaphragm. This, to my suprise, got the engine to runa and rev when pushed in further. This is wierd as the regulator cover has a pin in it that allows the plunger (that we were pushing in ) to move outward and thus kills the engine in our current tests. So, does anyone know any typical, acute failures with the old W115 IP? Could it be the leather diaphragm under the regulator cover? Any info on how the regulator fails and should work will be GREATLY appreciated.

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