My 403 was laid up for two years with half a tank of fuel. I had no problems with the fuel going bad. However, during that time mould grew in the base of the tank and it blocked up the fuel line at the elbow above the tank.
Not having the facilities to drop the tank and clean it out I resorted to a bottle of Forte and a large VW filter in the boot, which also gave me access to the lifting pipe and blow it through when it blocked. Hopefully it has cleared and no further problems will be encountered (we shall see!).
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