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Update to this thread. Tractor is now up and running again. Short version, the injection pump had rust and trash in it. The long version is that removing the injection pump and injectors on a MF 431 (and the similar 461) will entail removing all the sheet metal, steering wheel, dash, fuel...

Tier 2 compliant. Looks like half the injection pump screws are tamper proof. They have packed everything together real tight under the sheet metal...

It's not rebuilt. For much of the tractor life, it was not routinely used, but was regularly started. In 17 years, it would start on first crank. It has been used much more within the past few years with no issues. When I moved it to the shed it's in now, it ran fine. Throttle responded and...

Well sportsfans, same thing today as previous. I'm pretty confident that the metering valve is stuck open, which the governor nor throttle can pull back in. With the way the engine runs up, I don't want to risk engine damage trying to even back it out of the shed. Throttle is fully closed...

A day later and still starts with high rpm. On/off several times. I'll give it some more time and check it again.

Giving this a try. Pulled fuel filter, dumped contents, put in the Stanadyne and ATF. Started it and then shut off about a dozen times, trying not to let revs get too high. Now giving it some soak time. I don't see any indication of a shut off lever on this pump and there isn't a shut off...

I should have the stanadyne part of formula at parts store tomorrow.

Yes, it has the integral electric lift pump and filter. The Stanadyne and ATF sounds like it is definitely worth a try before pulling the front of the engine apart.

Governor should be internal to pump. I believe pump is a Delphi CAV DP210. I've had linkage completely disconnected from pump and same results.

I think I know the answer to this, but wanted to see if there is anything else I should check. MF431, Perkins 1103, Delphi pump. Under 300 hours on tractor. Tractor sat, under cover, for several months this summer. Recently went to start it and it wouldn't fire off. Checked the cutoff...