On my 1996, the inertia switch is on the passanger side behind the side panel (to the right of the passangers right leg). The inertia switch has a red piece on top.
When I change the fuel filter, I just remove the connector at the bottom of the switch and turn the engine over to run the gas pressure down.
Then, I use the "quick disconnect tool" wich is a little plastic round device that slips between the fuel line and the fuel filter to enable me to get the fuel line off of the filter.
I bought the "Powerbuilt" fuel line quick disconnect set part #648424
at checker auto for 11 dollars.
The 5/16" size will do the job.
There is a metal version of the quick diconnect tool available as well.
Good luck,
Gene