intermittant fault on isuzu 280 le 1996 diesel

hi i wonder if any one has any ideas on the following problem.i can be driving along when the engine will suddenly 'DIE', and to start it
again i have to bleed it from the lift pump, when it will run ok may be a coincidence,but it seems to happen when the fuel tank is on half or below.thanks for your time. lynne
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