Possible Vapor lock

I have a 2000 Chevie Astro Van. Yesterday, after driving in a lot of rain and having made several stops, when I tried to start the van, it would not start. It sounded like it wasn't getting any gas. I tried several times over the next 1/2 hr and no go. (It usually starts on the first try). 3 hrs later, I was brought home by a towing company. ( He thought I had a vapor lock, since it's done the same thing both times during a rainy period). An hour later, I started it and backed it into the garage. It died 7/8th of the way into the garage and I pushed it the rest of the way. I told the towing co guy about how it had done thiis same thing 7 weeks ago, which was also during while driving in heavy rain. The only difference then, was that the "service engine" light had been going on, so I replaced the throtle position sensor (TPS) which I had with me. (The parts house checked the cars computer previously and it said that was what I needed it but this was before the van stalled out). I thought the problem had been fixed, till yesterday.

The towing co. Guy noticed that there was some coolant leakage on a hose above the altenator (which was new a few months ago when I had a new fuel pump put in.)

This morning I started the van and it ran fine. I also checked the anti-freeze level in the resv. And it was down close to the bottom but still had about 2 or 3 inchs of anti-freeze in it so I filled that up. It is getting expensive being towed home and hoping you might have some idea of what my problem is. :

Hope someone can give me some ideas.

Thanks in advance,

Bob