What are the signs of a fuel pump going out on 2007 Dodge Nitro?

Hello, With your fuel gauge fluctuating like it has been, it sounds like a sending unit, wiring or gauge issue. This may or may not influence fuel pump performance, depending on the situation. The sending unit is part of the pump assembly. Fuel pumps do have an uncanny knack of failing and then working again -- without leaving any signs to go off of. Whereas your symptoms make me feel like it's more than 50/50 chance that you have a pump problem -- if only for the gauge symptoms alone -- guessing at this could be a waste of money also. Sadly, the only way to verify failure is to catch the concern in the act -- when it fails -- and test at that time. I know this is frustrating, but it's the only real way with a fuel pump concern.