Have had the tank out twice to inspect..no collapsing was visible..tank holds pressure fine as well...The smoke test was also done as well as a pressure test...I am told to to 16 psi....This was done twice with the tank removed from the car. I have a spare tank in another car sitting at the same shop, and were the tank showing any signs of leaking, they were more than prepared to change it...might still come to that, but hard to believe no signs of fuel leaking under pressure or visible smoke either if the tank is cracked.,

There was at one point fuel under the tank which was actually from fuel running down the outside of the fill pipe (upper rubber seal was bad) through the trunk, and down to the bottom of the tank. This has now dried up. Forgot to mention that it also had a fuel leak from loose fittings at the fuel filter...all of which had been fixed during previous episodes.

The fittings were all checked and tightened on the bottom of the tank as well. Yesterday afternoon, just before I wrote this, I took the car on a run from being up on a lift...got the fuel odor nice and strong and went straight back up on the lift...no fresh fuel under the tank or on the tank, or under the rubber bale that supports the bottom of the tank..in fact no signs of fresh fuel leaking anywhere...but lots of cabin odor...but only with the window down and drawing air into the car from the rear vent.

At one point there (a few weeks, and multiple repairs ago) was fuel under the car...but very much forward of the tank and pumps...however yesterdays inspection showed no fuel leaking there either. Will try again to see if the eha is leaking..but was dry to the touch after a hard run and strong cabin odor when I looked again yesterday.