300TD Wagon won't hold Prime - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 07-12-2009, 02:43 PM Thread Starter
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300TD Wagon won't hold Prime

Hi Gang,
I am new to Benzworld, but I have been visiting here for serveral months and have picked up a wealth of infomation. Thank you! I am having a problem. My 300 td will not hold prime. Bubbles are getting in to the return line. Before this I discovered crud in my fuel tank. I ended up removing the tank and back flushing the lines from the injection pump all the way back to the fuel tank. I replaced the fuel filters and priming pump and all of the braided fuel lines. I am still getting air into my fuel system. I even took it to a diesel mechanic and he went through everything and could not find where air could be getting in. When the engine is cold it will start and run. When the engine gets hot it runs fine until I shut it down. When I start it up again it runs for about 20 seconds and dies. The return line is full of air. I can prime it and it will run again. When it is hot I have to prime it every time before it will start. Does not do that when it is cold. It was my daily driver, and there are no obvious fuel leaks. Any ideas? Thanks in advance!
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post #2 of 2 (permalink) Old 07-12-2009, 05:22 PM
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