You need a good multimeter and a wiring diagram to avoid guessing.
A fuse is either blown or it's not. No such thing as a partly failed fuse.
I would be suspicious of a high resistance contact somewhere. Either in the connections to/from the fuel pump relay, inside the relay or on the chassis return back from the pump.
Following along with the meter you will find at the point where 12V has dropped to 3V.
It will be a simple relief valve limiting fuel system pressure. Variable voltage is too fancy for such a small application.
There is a part listing on the Deere site for that tractor. There maybe enough detail in it to follow some wires.
A service manual from 1-800-522-7448 will go a long way.
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Today's Featured Article - On the Road with Dave Gohl: Auction Musings - by Dave Gohl. I was thinking the other day about all the auctions I've been to in the last few years. There've been many. Some have been very good, some have been well, disappointing to say the least. But no matter how good or bad auctions may be, we always seem to stay until the item we've come for or are interested in is on the block. I've been to some auctions near and far. I think the furthest has been the Two Cylinder 7 in the Amana Colonies last year. Lots of stuff, lots of people. I've also atten
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