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- Preston Lancs.
Doh. Got rid of all my leading spaces!
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That is not pin 5. That is pin 1. Pin 5 is the one that goes across. As opposed to the other three that go up and down. Fuel pump is energised in three ways. When glow plugs are lit. When engine is cranked, when engine is running pull down is powered directly by alternator. If it runs when ignition is off and there is no power to pin 5, with relay removed, but runs with relay in, then it has to be relay faulty. If it runs when relay is out it has to be fuse box but can't see that happening. If relay checks out OK and pump runs with it in, one of the diodes may have cooked closing the pull down circuit. Pin 3 power from fuse 39. Pin 5 feed to pump from pin 3 when relay is pulled down, when current is applied through other two pins by any of the aforementioned senarios..
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