Sounds to me like a fuel pressure problem, as in the fuel non return valve to the tank, as I have had diesels where one or two plugs go and you dont just get a small amount of smoke you get loads like a fog and it continues for quite a while. The fuel pump only kicks in while cranking the engine and not whilst the ignition is turned on, there should be fuel in the rail, which stays there from when you turn it off, ready for the next morning, but if your non return valve has gone, overnight it will return to the tank, so when you tow it its turning over faster than by key hense the pump is pumping like mad to refill the fuel rail, then she fires up, you say you can leave her for a while,but takes a bit of cranking before she fires up , thats because the fuel has started its return to the tank.
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Last edited by marti5; 12-29-2008 at 11:52 AM.