The injection pump would be the last things I'd suspect with starting problems on a 2940 - as you described them.
White-bottle Power Service won't do much when you dump it into fuel that's already gelled. The red-bottle will - but only if you remove the fuel filter and dump some directly into the filter.
2940 uses the square fuel filter that easily gets plugged with ice chips at the bottom. That's a different problem then gelled fuel.
When you crack an injection line -even when the pump is working correctly, you will only see a few drops of fuel.
Also, injectors do not get "cavitated" if the engine is running - as long as fuel is flowing. If they DID have air, they will bleed themselves out.
I'm not saying CAV pumps never have problems. But, from you describe - I doubt it.
Also note that when the 2940 was brand new - it had many cold starting problems. It was probably the most problematic cold-starting new-generation diesel that Deere ever sold - dating back to 1960, anyway. We sold them new, and had to make many modifications on them. In fact, the 2940 problems led to Deere coming out with new style pistons.
I'm going by these comments you made earlier . . .
"the fuel filter was gelled even though I put new diesel in in Nov and put half a white bottle of power service in at that time. Ran the tractor several times since then with no problems. Thought maybe I had cavitated the injectors so I loosened the two nuts on one injector."
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