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Old 04-26-2023, 11:55 PM
PradoTDI PradoTDI is offline
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Join Date: Apr 2023
Location: MT, USA
Posts: 19
Thanks for the input! I have not tried turning the engine over by hand, just on the starter. I drove the car about 400-500 miles last fall before winter hit, and it ran pretty well with the exception of the low, shaking idle.

I took a closer look at the fuel line connections on the IP, and based on what I remember of the OM617 in my old W460 and what you said above I think I've got a pretty good idea of the fuel flow path. Got some new fuel hose and some clear tubing, so will try pulling from a small fuel can and see what I get.

Being an early OM617, it has neither the early aluminum/white plastic primer nor the later black plastic one, but a mushroom shaped primer pump attached to the fuel filter housing. The primer seems to work well, but I might cap off the feed lines to the pump and filter housing and pull a vacuum on it to make sure.

I have a set of pencil style glow plugs and the associated timer and relay that I built a wiring harness for. Since the glow plugs will be replaced anyway I may go ahead and pull them to make it easier on the starter while I'm trying to bleed the air out of the injector lines. Once I can get the car running and can check for air in the fuel I will start trying to adjust the idle.
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W115 300D Starting Problems-img_5037.jpeg  
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