Hello all,

just wanna throw this out to the forum to try and get a fresh batch of ideas for potential solutions. I'm having a slight problem with my Benz.
'78 OM617, 123.150

It's like a fuel system "gremlin" that only comes out AFTER high speed driving. No problem on start-up or regular driving or even during high speed driving but after, say 100 miles I-77 @ 70mph, pull of an exit and its like it wants to "chug down".. hit the pedal and it chugs away from the stop but it regains power after say 7 seconds. Then, the "chuggin" symptoms will continue after pulling away from stops for the remainder or the trip. Get home, shut off, cool down, next day.. symptoms will not reappear until AFTER a bit of full speed driving.

Long story short.. i've tried several things trying to cure this problem but with nothing obviously glaringly wrong i'm running out of ideas. i've changed both fuel filters, checked fuel lines for cracks and leaks, tightened all hose clams, visually inspected the fuel flow by looking at the filter, checked the air filter, and like i said... nothing obviously amiss.

one more thing. I have a two tank grease car system installed for years no problems. Using Just pump diesel in the "grease" tank, with the water heat shut off, there are NONE of the above described problems. So, based on that, I've isolated the problem to the stock fuel system.

Thanks for wrapping your brains on this for me. i'll appreciate any and all cements.

P

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Current fleet
2006 E320 CDI
1992 300D - 5speed manual swapped

former members
1984 300D "Blues Mobile"

1978 300CD "El Toro"