This has to be a motor home. I my self would look first at and around fuel tank.
If it can't be located then check fuel line into crab and follow line you will come to filter.
May be you have to open engine cover between seats to get to it.
If a newer model, it is an electric fuel pump in the gas tank.
I believe the electric fuel pump is inside the fuel tank
most of your late model vehicles have the fuel pump located in the gas tank
The fuel pump in located in the fuel tank on a 1991 BMW 525i. This model of BMW uses an electric fuel pump.
in fuel tank
carbarator model is on the back of the block injection model is in the fuel tank
The fuel pump on most gasoline injected vehicles is in the fuel tank.
It is located in the fuel tank Rear passenger seat at the passenger side. Fuel pump is used to pump the fuel.
How to change fuel pump from Toyota Noah 2002
Mercury automobiles produced after the 1991 model year have the fuel pump inside of the fuel tank. Models before 1991 and the fuel pump on top of the engine.
In the fuel tank
In the fuel tank