HELP! Just fitted a new fuel filter - are there supposed to be two rubber o-ring seals? There is one that came as part of the new filter on the neck, where the control valve sits, half way down: is this the one the Haynes manual is referring to? . There seem to be grooves for two seals though. Thanks

There usually are, assuming a diesel. Two O rings that go on the valve, a blue and black if I recall correctly.