You may be able to feel the vibration the pump makes if it's still running.
Where is the fresh water tank located? Sometimes the pump is close by. Usually at or near the bottom level of the tank as well.
Happy Glamping, Norman & Elna. 2008 Winnebago Adventurer 38J, W24, dozens of small thirsty ponies. Retired after 40 years wrenching on trucks! 2010 Ford Ranger toad with bicycles or KLR 650 in the back. Easy to spot an RVer, they always walk around with a screwdriver or wrench in one hand!