I have the same problem with my 2004 Triton. Checked all the fittings numerous times and everything was fine. I also have a Plastic Gas Tank. Till I can solve the problem I have been leaving the back hatch open during storage. I also get a fume build up in my Rod Locker so my concern is that my mono line will absorb the fumes & break down prematurely. Hope somebody out there has an answer. FishHunter