Hello everybody

The A.M.F.A fresh water pump stop sometimes working. After I give a soft "kick" on the pressure switch, it start working again. It looks like that the switch sometime does not start after the pressure goes down and when it start, the pressure goes up slowly.
Does anyone has any advise? can you please write me what is the hi and low pressure that it should work? and how much I should pump the accumulator tank (and how to measure it) ? I think it could be a dust somewhere?

Thanks a lot 
Lior, SHARONA A54 #18