John Deere 500c Backhoe fuel in oil after sitting.

[TreeZ]

Fuel line shut-off valve if operating correctly should stop fuel from entering engine crankcase while engine is setting idle IE not operating BUT valve will have no affect on the problem while engine is operating. In today's world of "almost right parts" I would be checking transfer pump to determine if it was the cause of fuel in crankcase. Another option is just disconnecting fuel transfer pump & installing an electric fuel in it's place. If it wasn't the cause then R&R umbrella seals on inj pump shaft. You definitely don't want engine oil thinned by diesel destroying your engines crankshaft bearings!!!!!!!!!

100% thanks TX Jim! Will be digging into this soon!

 

[Tx Jim]

You're welcome

 

[dirtaddict]

Any chance you're filling the tank so full that diesel is flowing up the return line to the injectors? I don't believe there is any check valve on that line. Sure makes for an easy fix...

 

[TreeZ]

Any chance you're filling the tank so full that diesel is flowing up the return line to the injectors? I don't believe there is any check valve on that line. Sure makes for an easy fix...

Nope, that sure would have been nice and simple.