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Diesel fuel has two distinct problems.
1. It contains a small percentage of water. If a vehicle is left unsued for extreme periods, the water promotes the formation of algae, in the form of a slimy sludge which neither the fuel pump, filter, injector pump nor the injectors are able to allow passage.
2. It also has a fair amount of paraffin (wax) in solution, and when the temperature drops below 20F, it congeals, and again is unable to pass thru the fine orifices/strainers on its way to the cylinder.
There are a number of fuel additives which can rectify the problem. Here in the U.S., we have "Power Service" and "Siloo", which can be purchased at any Auto Store. It normally only takes 4 oz. per 20 gal. to keep a diesel going, and at the same time, it completely cleans the system. I would suggest doubling the recommended dosage to accelerate the process. If the problem is truly "sludge", you may have to change the filter several times before all sludge and other debris is fully removed. I'm reasonably certain you have an equivalent treatment where you are.
Einar
U.S. Merchant Marine
Chief Engineer
Steam, Motor (diesel), and Gas Turbine Vessels
Unlimited Horsepower
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