OK mechanic types. I went to start my emegency generator and found gasoline in the lube oil. What would allow this to happen ? It is a 13 horse 4 cycle Generac 6500. There is a significant amount of gasiline in the lube oil.

When was the last time the oil was changed?

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1984 300SD Turbo Diesel 150,000 miles

OBK member #23

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does it have a gas shut-off valve.if so if the gas got left on it could bleed by the needle valve in the carb and flood the engine with gas.drain the oil and refill and run it.

Ditto.

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)

If it has a mechanical fuel pump, the diaphragm can rupture, allowing gas into the crankcase.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

This has been known to happen to Cub Cadets with a gas shut off valve. One owner's wife, ran a Cub like that to destruction. Gas is not a good lubricant.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags

Yup -- my old Vespa did the same thing!

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)