There is in fact no lift pump at all on the 2.8CRD, all the fuel is delivered by the vacuum created by the main (high pressure) pump, therefore any resistance in the fuel line, or air leakage will screw the fuel delivery completely. Mine has suffered from poor starting when the engine is hot from the day I bought it, never solved the problem except by squirting cold start - seems odd but works. Fuel filter housing is always suspect, replaced mine some time ago when the diaphragm gave up the ghost.