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The 2001 svc. manual shows g103 as the ground for the fuel pump relay control side. G103 is a splice pack (small grey/black plastic box) that is attached to a bell housing bolt/stud at about the 3 o'clock position viewed from rear of engine almost in line with the trans. range switch. You can open up the splice pack and check for corrosion/poor connections.
The 2001 is set-up like Ion said with the pcm sending a 12v signal to relay for pump turn on. Cannot speak for your 2004 but sounds like you are on the right track with the ground circuit. The '01 schematic shows no connectors in between the under hood elec. center and g103 to check in that circuit.
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 0 hp / 0 tq
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