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Need some help with fuel issue on JD 855. Fuel system kept losing prime. Discovered fuel in crankcase oil. After tractor sat a few hours all fuel siphoned into crankcase. (Has a mechanical fuel pump on this model) I had suggestion that bad fuel pump was allowing fuel to pass into...

My JD 855 will not keep prime. After priming and bleeding air from system it starts and runs until all fuel in filter is used then quits. Bad fuel pump??? Once it is primed appears to pumping fuel but will not sustain. Any insights would be appreciated.