Andrew Shadow
Site Supporter
I think that he is referring to jumping the fuel pump, not the battery.So, backing up to your first post:
I would think that statement points to a bad battery or a loose connection at the battery terminal. If it is starting and running just fine with external voltage (a jump), then there shouldn't be any issues with your wiring, relays or components. Everyone is giving you advice and test procedures based on the assumption that you have a working/good battery. A loose battery connection will sometimes give good voltage, but then drop to nothing once any amps are pulled. Normally, this is most noticeable on a starter that draws a lot of amps (it will just "click" once and never turn the starter).
Can you confirm that if jumped there are no issues, and it will remain running once the external battery is disconnected? If that is the case, look closer at your battery connections and possibly take your battery in to any auto shop for a test.
Ryan