The filters are there to prevent dirt from the fuel and the tank reaching the injection pump and the injectors. Fine particles in the pump and injectors, potentially causing timing problems and incorrect fuelling which can show up as a loss of power and smoking exhaust.
The main filter, on the bulkhead of series, inner wing of Defenders, and rear right wheel arch on Td5, must be change at the correct service intervals. Otherwise, it becomes choked, reducing the amount of fuel that can floe through. The first indication of this will be under heavy engine load such has towing, or a long high speed climb on a motorway. The engine will literally run out of fuel, losing power gradually, and ultimately stopping. You’ll find it drive fine again after a few minutes rest, until the next prolonged full load drive. Filters have been known to clog between services on Tdi engines so buy your next service filter early and keep it in the vehicle, just in case.
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