Startup sounds normal. The pump breather tube is just a 1/8" tube around the back side of the pump and it should run down along the engine block. I believe it's attached to the pump with a banjo fitting. Just remove it and blow it out with air. Also, just remove the level plug from the pump and see if the cambox is full of fuel. That will tell you right there if that's the fuel source or not. To do a quick check on the injectors, start the tractor, warm it up a bit and then at idle open one injector at a time. Try to determine if the engine staggers about the smae amount each time. If you open one and the engine doesn't stagger, or it's less than the rest you would pull that injector and look at it. Otherwise I wouldn't pull any of them. If you do go to remove any, hope that the injectors are on bolts rather than studs... Get two big curled pry bars (injector bars) and lift evenly on each ear of the injector. If the injector is bolted in then you can give the injector a twist to break it loose. If it's on studs, you can't...
To be honest I've never seen a Simms/Minimec pump get bad pumping elements to the point that they're passing a lot of fuel. I've heard of it, but not seen it myself. I'm told the tractor will start hard when it's hot if that's the situation. The other possibility is a crack in the pump's fuel manifold or a perhaps a bad gasket, although I'm not sure about the gasket.... This is getting complicated.
One more thing that I just though of..... Pull the air intake hose off the intake manifold and look in at the thermostart unit. See if there's fuel running down the manifold. That's another culprit on those tractors. Check that FIRST. That would be an easy fix.
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