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More than likely it's the check valve inside the tank. When you did your pressure test did it immediately (or rather quickly) fall back to 0? If so it's the check valve and nothing to really worry about. If the pressure held when you turned off the motor, then yes, I would agree that a tune up is probably in order, and you might want to run some seafoam through the engine. (do this before changing the plugs) and see how it works out for you.
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