There are only two places where you can get fuel into the crankcase on the 806. Either it has to come past the shaft seal or from unburned fuel from the injectors. If you got two additional inches in the crankcase in a half hour of running it is highly unlikely that faulty injectors are the problem. You would surely notice poor starting and excessive smoke if they were that bad. That leaves the shaft seal and pump adapter for the leak.
There is no seal inside the pump. The only seal for the fuel is the rear seal in the adapter housing. The side of the seal with the spring in the lip must face the pump. The front seal is installed with the lip forward and it is there to seal oil from getting into the pump. If the front seal were to be installed backwards it is unlikely that oil would actually leak into the pump since the fuel in the pump is under a slight pressure.
It is possible though unlikely that a porous housing is the cause. A defective housing would usually leak long before this. More likely causes would be a damaged seal, a seal installed backwards, a housing damaged when removing the old seal, or damage to the shaft.
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Today's Featured Article - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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