It's possible someone used the jumper wire to load side of fuel pump relay, gray wire. That supplies voltage to fuel pump motor, the fuel pump fuse is hot all the time. The fuel pump will run all the time even with key off, running down the battery. They used the jumper because of some kind of problem. Can you unplug the relay and check relay terminals, where the relay plugs in. Use a test light, either a problem on the load or control side of relay. Are the relay terminals numbered, like 30 and 87, maybe 85 and 86 also?
SOURCE: shuts off while driving. no fuel pressure. pcm fuse blows/ fuel pump relay inserted.
Sounds like the fuel pump is shorted.
SOURCE: 2000 Jetta Radio is dead after a dead battery jump start
Some German cars have anti-theft device inside to make it useless to steal...check at the dealership to see if jumping the battery will activate this(the car thinks its being stolen) .
SOURCE: 2000 kia sportage pump is working relays have been
there is a splice for fuel injectors at the front of the fuel rail conduit and electric tape will need to be removed to see if it is ok then clean up all engine grounds and ecm grounds on passenger side kick panel if this doesnt help check coils and crank sensor
SOURCE: Starter/Fuel Pump fuse, or the Relay Fuse blow
the fuel pump comes on when you turn the key on the starter comes on when you turn all the way to start so i would think the short is in the fuel pump if it blows by just turning the key on
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