Quote:
Originally Posted by the heap
I have the same situation in the engine on my '79 300D. No spring. When I installed one from another pump, the engine wouldn't run. Removed it, engine started and ran like before. WTF?
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Both of you gentleman with no return valve springs should check your operational fuel pressure between the second filter and the injection pump. It has been proven they will run without a relief spring but not as well.
You do want some fuel pressure in the injection pump. What the two of you describe might be a method of covering up very weak lift pumps was my first thought.