yes sounds like filter head could be faulty [if it's one with hand primer on] but also there was a mod on 2.5 transit engine to swap leak off from front to back injector,for this you will need a new length of leak off pipe.this was to cure misfiring and needing bleeding to rectify![ convoy has ford 2.5 transit and transit duratorque engines,ldv 400 has peugeot and land rover 2.5 engines fitted-dont think peugeot fitted to convoy.]
k, September 2010
you could check for the fuel system drawing air,pay particular attention to pipes in the engine compartment and the filter head also,check for chaffing and splits,loose unions etc,good luck
