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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum

550 Diesel fuel system problem

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shovelhead

06-11-2006 17:50:53

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Been working on my 550 that has been sitting up for 4-5 years, I'm experiancing an air in fuel problem that seems to show up after the tractor sits up a few days. What happens is that after the tractor sits even overnight I have to use starting fluid to get it to start , and then I'm getting air in the injector lines after I get it running . So I have to go through the bleeding process at the injectors.Once it straightens out and runs ok it is now showing white smoke which it never did before. So I have replaced everything from the tank to the injection pump ( fittings , filters and rubber gaskets , gasket at sediment bowl on fuel pump ) . Low pressure side is bled and gets no air at line going into pump. Can the Bosch Type PSB 4A-70V-S481A pump draw air when running ? Is there a possibility of leakback when the tractor is not in use. I never used to have to use ether to start this tractor...but now !! Can anyone tell me where to look next? Thanks

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