Twenty years ago diesel lasted for years. It can now be assumed that all diesel is infected, and if in contact with water, bacteria will grow at the interface in a few months and at the very least block filters, if not worse. This can be prevented by either keeping the diesel dry (impossible except inland or in sealed storage) or, more practically, by using one of the additives mentioned above. If the diesel is in a stationary tank, it can be safely drawn from above any water, but in a vehicle the muck will be stirred up and get into the suction.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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