Join Date: May 2005
My Motorhome: Carthago Chic I 4.2
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Welcome to MHF as a visitor.
There are 2 types of pump. One is a submersible pump which would be suspended in the fresh water tank. The other is a diaphragm pump which would be located elsewhere, possibly in the heater compartment.
Assuming the pump is not faulty, the main reasons for low pressure are:
a) air in the system
b) a water leak in the system
Suggest you start with opening all the taps (one at a time), with the pump switched on, and see if any air comes out.