Longest it's ever sat to my knowledge was maybe 6 months while I procrastinated on the engine swap....and even then I drained the tank below pickup level by shorting my electric pump (I was already FI before I swapped to a turbo block). Previous 2 owners drove it regularly back the past 10 years or so.

Looks like we have another dry day tomorrow so maybe I'll dig in after work.

1989 Nevada Sand Raider 2.6 5-speed
Turbo FI with Megasquirt