86 300SDL Wont Shut Off

I just replaced the fuel filters and now the engine will not shut off. What did I do wrong?

My 86 300SDL has be doing 24-28 mpg for the past 6 years, but recently is has dropped to 14 mpg after sitting idle for 6 months. I replace the fuel in the tank with fresh fuel but mpg dropped significantly.

Now it will not shut off. What to do?

Forums

Diesel Engine Specific Aid

Chassis Model Number

W124

Check for a loose vacuum line

You probably knocked off a line when working on the engine. See my video on why wont my diesel shut off.

Thanks. Found a worn vacuum

Thanks. Found a worn vacuum connection and replaced it. That help a lot but it still runs for a second or two before shutting off. I've decided to replace all the rubber vacuum hose connectors. Am hoping to find what I need at Autozone.

Does this vacuum problem affect mpg?

Last question: Rather than mailing your booklets, have you considered allowing them to be downloaded from your website after being purchased? Some of us are looking for a fast answer to a question and can't wait three weeks for snail mail. Good site. Thanks.