Air getting into fuel system 1983 300SD - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 04-01-2011, 06:53 AM Thread Starter
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Date registered: Mar 2011
Vehicle: 1983 300SD
Location: Austin, TX
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(Thread Starter)
Air getting into fuel system 1983 300SD

I have a 1983 300SD. I have a problem with air somehow getting drawn into the fuel line which prevent it from starting. I can get the car started by loosening the bolt on top of the fuel filter cannister, pumping the hand primer pump, and cranking the engine a few times which bleeds the air out of the lines. The car runs fine after that and will restart. But if if I let the car sit over night, air gets into the fuel system and won't start. I have replaced the hand primer pump and the fuel filters are not that old. Any suggetions on what might be causing the problem?
thanks for reading,
MarkeeP is offline  
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post #2 of 2 (permalink) Old 05-15-2013, 06:04 PM
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Date registered: May 2013
Vehicle: 1982 300SD
Location: Waldo FL
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Hey Mark, you are describing my exact problem, i have replaced the primer pump as well, with no avail to solving the problem, car runs fine at med rpm's, (75mph) but when i try to get it to idle, it soon begins choking it seems on air, prefilter has a bit of air but i thought that was normal....? as long as i bleed it before starting, it runs fine. Did you fine any solution? I would appreciate some advice.
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