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Replace the diesel pump or fuel-tank pump??

1K views 0 replies 1 participant last post by  congalaig 
#1 ·
Put an engine in an e39 - the 3rd one and made the mistake of not doing this one myself. No throttle so ended up replacing the loom and away it went. Next problem - It will start with some difficulty but will only run on high revs for a few minutes and dies. Question is, do I need to replace the diesel pump or the fuel pump in the tank. 1. If the diesel pump went could it still start and run for a few minutes?? If the fuel pump went could it still start and run for a few minutes ?? Which do I replace, or both, or something else? Anybody know???
 
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