I have a 84 300D that has been having trouble accelerating over 60 mph on the highway. Now it is having problems at lower speeds as well. The clincher is that this only happens on my normal tank, but when I switch to my second tank (for vegi oil) the problem disappears. I realize the problem must be downline of the transmission, engine , etc. but I cant figure it out. After replacing the diesel tank feul filter it still exists. Any ideas? Also, maybe unrelated, when I accelerate at times there is a gun type sound that fires at regular intervals out of the muffler. The intervals increase when acceleration is increased.

Thanks for your help.
Sam

So you replaced the tank strainer, yes?

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1981 300d

Do you hear a hiss when you open the tank cap? Got air leaking in the lines somewhere?

Wait wait wait. DID YOU JUST SAY GUN SOUND? Like BANG?

Injectors? Compression test?

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1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

I hadnt replaced the tank strainer, is this likely the problem. There seems to be no air leaks, everythings runs pretty smooth just after driving for a bit on the normal tank all pickup seems to stop. It does run ok at first though.

Yes there is a gun like bang that occurs after highway driving for about 1/2 an hour. Im concerned about this, it makes me uncomfortable.

Thanks
Sam