Chris,

I was suffering from the same gas smell.  It wasn't my gas cap, but rather
the rubber seals that hold the check valves in the plastic evaporative
canisters that reside in the front wheel wells.  The easiest way to check
this is stick your head in the front wells .... and sniff.  Mine was worst on
the driver side.

I bought the new seals from the dealer (Charles Maund).  Easy to install.

Jim Bowen
Round Rock, TX
'88 Wolfsburg