2000 Plymouth Voyager Gas

Smells problem
2000 Plymouth Voyager Front Wheel Drive Automatic 160000 miles

This isn't really a gas smell but a gas leak problem. I have had this van since feb 2008 and in the past two months all the gas has leaked out of it. It happens when I start the car to let it warm up. The first time it happened I thought I ended up with a gas leak in the gas tank so I have only been filling it up with 10 dollars at a time which gives me about a half tank. I went out this morning and started the car and all the gas leaked out, again. There was only about 1/4 tank or so in it this time.

I am really stumped with this issue. I have had it checked and there is no wetness to indicate where the leak could be coming from.

Like I said this is the second time in about two months maybe a little less. Any ideas on what I should be checking for or what could be causing this to happen?

Thanks for taking the time to help me out.

Karen