Unless something has changed you get a fuel pump as part of the install kit that
Prochem sends out FREE with each one of their truckmounts.
Now, they may be charging you for a fuel tap kit which can run around 250.00 depending on your model and year of van.
And, before everyone chimes in and says you can tap into your fuel tank without the expensive kit remember this. Your installer can and would be held liable if they just drilled a hole in the filler neck and ran a line into the tank. You get into an accident and fuel spills out and the van blows up with you in it, you can be sure that the lawyer representing your family would sue the pants off them. So, that is why a "expensive" fuel kit is required. For our liability and to meet D.O.T. regs.
Bottom line? Check to see if they are trying to charge for a fuel pump or if it's the fuel kit to tap into the tank.