Proud Member of the 1K Club
Join Date: Jun 2010
Re: John Deere 425 Fuel Problem
Don't let the electronics spook you too much at this point. There is a fuel pump relay I believe, that could be the cause of the problem.
Since you sound more comfy with mechanical things than electrical, here's the most basic way to check w/o a schematic or probing things under the dash...
Pull the fenderdeck and check for power back there at the pump. I think all that holds it on are a couple bolts at the front and two under the seat. Then you can probe the power connector back there. If power, then it's the pump. If no power, then it's electrical - again, probably the relay.
You'll need the schematic to go much further...