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I bought one injector and swapped it out for each injector.Didn't solve the problem Pump doesn't have a driveshaft, it's driven by a cam below and has followers in the bottom of the pump. I'll run it tomorrow and if I still has the same problem I will have the oil analyzed.

Thanks for the replies, I appreciate it. The hydraulic pump is a good suggestion I never thought of but I don't think that's the problem because I took the injection pump apart and after I put it back together it didn't gain any oil for several hours or more (probably more like six or eight...

B20 Kubota TLB. It was gaining probably an inch on the dipstick in an hour. I replaced the fuel pump with an oem from Coleman's Kubota. Still gaining the same. Next I removed the injection pump and took it apart and didn't see anything wrong with it, just cleaned and reassembled it. Put it back...