right now the pulley can be moved in and out a few centimeters from the pump... does that mean i should replace it? it was working fine when it was last used.
Does the pulley slide on the pump's shaft, or is the shaft actually going in and out of the pump? If the latter, a little bit is normal. If the former, that aint right at all. I would get a new pulley if you are renewing the pump.