The fuel hoses on my 2001 go to the rear inside the passenger side frame rail.
You can access the fuel tank opening by extending your generator slide and crawling under the coach.
The photo provided is one I took after I installed a FASS fuel pump.
Many vehicle owners who have the ISC/ISL engine have had trouble with the fuel pump leaking and letting air in the system. The stock pump runs for 30 sec after you turn the ignition key. After 30 seconds, the CAPS pump starts sucking the fuel.
This is a great read from IRV2:
https://www.irv2.com/forums/f104/fas...e-484540.html*