Where is the fuel smell most noticable and under what conditions?
The fuel lines for the L98 in your '91 consist of sections of hose and
sections of steel tubing. Of particular interest are the hose sections that
provide a transition from the hard lines along the frame (ahead of the
filter) to the hard lines that rise up to the fuel rail from the lower front
passenger side of the engine block. There are also hose sections ahead
of the differential and at the top of the tank under the cosmetic plastic
panel that the filler neck rises through.
The car is now nearly 18 yrs old. If you can smell fuel, then my vote is
that you should carefully check each of the sections of rubber hose in
the supply side and in the return side to ensure that the hose is not
weathered so badly that leaks are occuring.
VtVette's thread from last year might be of interest:
My annual post: REGARDING C4 ENGINE FIRES, EVERYONE READ!!!
At the very least, consider carrying a meaningful fire extinguisher.