Allis Chalmers 715D Backhoe

rfazio

Member
I've got an Allis Chalmers 715D with a Cummins diesel. She runs pretty good, until recently. I had it sitting for a few weeks and went to start it. She ran for a half minute and died. I cranked and she starts right up then dies in a few seconds. Finally gave up, and let her sit. I go later and try again and she starts and runs, bad but runs. I get it up to the barn and pull the fuel filters. They look bad, so I run to Napa and get new fuel filters. One is a water drain and pre filter, and the second is the main filter, I think. So I fill the filters with fuel and she starts right up and runs fine. Great one problem fixed. I let her sit and couple of weeks, and the same thing, dies on startup, wont run for more than a few seconds. I let it sit for an hour and she starts and runs fine? I'm baffled. I'm thinking maybe air getting in the fuel system somewhere? I see no leaks. Wondering if anyone has an idea.
 

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