Posted by pete 23 on July 26, 2010 at 10:38:35 from (173.87.9.228):
In Reply to: fuel in oil 706D posted by Michael Johns on July 26, 2010 at 08:10:02:
Return fuel line on bottom of tank is correct, and they did have a check valve in them. This does two things, one is keeps fuel from running(usually drip though) out of tank when you remove return line and it also creates a little back pressure in pump body for better cooling of pump. They seem to run just fine without a check valve though and if it plugs it of course will not run as the pressures equalize on both sides of pumping plungers and they will not take on any fuel. I have seen engines fill crankcases from missfiring, some with bent push rods, very loose valve setting and or badly leaking injection nozzles. This usually happens on a combine engine where operator does not detect a missfire . There are no other places to get fuel in crankcase, has to come from pump seals or through the nozzles. If worse comes to worse, I would fill fuel tank, pull pump off with drive so seals are intact in the housing, fuel supply and return lines on and let her set to see if fuel comes out of end of drive housing.
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