After getting a propane fill up in preparation for our camping trip, we heard an unfamiliar clicking noise coming from the back under the sink. After we tested the refrigerator fan and house water pump, we decided it was the auxiliary fuel pump. Apparently, it runs whenever the engine is running, but we had never heard it when the engine was turned off. It is controlled by a relay mounted under the hood on the firewall.
I wiggled a few wires and the clicking stopped. Dam I’m good.
Unfortunately, the van wouldn’t start without the clicking noise. Dam I suck.
So I unplugged the wires and plugged them back in, now the fuel pump turns on when the ignition is on, but stays off when the engine is off. Yey!