check the earth for the pump,chances are it will be corroded and giving an intermittant connection,you can test this by linking in a temporary earth on the negative terminal on pump then driving car to see if symptoms persist,while you are there make sure both positive and negative terminals on pump are secure...if this dosent sort it then change the relay(easy and cheap)also check connections on plug to relay and give them a blast of WD,relays can break down over time as they only contain a wire coil and a set of duel points similar to ignition points........if neither of these virtually free repairs cure it then it will be the pump cos theres nothing left....its doubtful to be tank debris but even if it is then it renders the pump U/S
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