QuestionI recently just bought a 1981 240D the guy I bought it from had all the fluids $ filters changed. He said that it had been running fine but when it got to one-half a tank it would stop like it was out of fuel.It will restart run a little ways then stop again. It will idle and not stop but when you drove it it runs then stops. I recently went on a trip in it. Sure enought when the tank got to one-half it started. I fill it up it held 9 gallons so it didn't think the guage was wrong and it was empty. I started the car & pumped up the fuel injecter to get the air out the line just in case it had ran out. The car ran a couple of miles then quit again this went on for about 30 miles then started running fine.I notice that when going up a hill and need more fuel it would quit. When the fuel tank is kept full it seems to run fine. What's up? Thanks for your help.
AnswerYou have a leak on the suction side of fuel system, or fuel fungus plugging the filters.
Start with the spin on fuel filter, replace it, and be sure to replace the O ring seal on filter bolt with a NEW one, tighten the bolt hard.
Replace all fuel hose showing cracks or moisture.
Read these threads for more suggestions.
300SD Fuel Filter Replacement Instructions
http://www.mercedesshop.com/shopforum/showthread.php3?t=105344
Biobor, what is it, why do I need it?
http://www.mercedesshop.com/shopforum/showthread.php3?p=723857#post723857
Filters, Fungus, Biocide, etc.
http://www.mercedesshop.com/shopforum/showthread.php3?p=823378#post823378
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