Yeah that pressure part is kinda worrisome. If it builds some pressure then the gears probably are okay and most likely one of the pressure reliefs is sticking open. They look and operate much like a needle valve in a carb float bowl (only with a stiff spring to close them) and are a snug fit. A little water causes them to rust slightly and the spring wont close them after the initial opening. Usually the one in the bottom part of the primary pump is the culprit, the one in the top of the plunger body, not so much.
Also, these machines will run at light slow loads without much pressure from the primary, but I've never tested them to see how low.
Also, priming these things is way over rated. I have yet to find one that will not run up and clean itself out is a short time. That gas cycle is very effective.
To check the rack, pull the filler neck. Just two little bolts, but be careful of crud around the base. Work the throttle and look for and look for anything NOT moving. The rack gear slides horizontally, front to rear. It is usually easiest to pull the pin on the double spring thingy that moves the arm on the pump.
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