Exercise your pump.
Some M12A1 decons won't pump decon because their fuel injector pumps have stopped pumping. Prevent that problem by keeping fuel injector pumps pumped up with exercise.
When your M12A1 sits for weeks without being run, the fuel injector pump gradually freezes up. Then when you are ready to decon, the engine won't start. The M12A1 is off for repairs and possibly a new fuel injector pump.
Follow the TM and do all the PMCS (before, during, after, quarterly, and annual) on your M12A1, which includes hooking up the entire system, starting it and running water through it. Then the fuel injector pump will have no problem doing its job. So do your job and do PMCS.