Missd - if you're still out there...
I had the exact same problem with my pumpkins last year. It was my first year attempting them. I planted them late, but I got plenty of male
flowers, and I'd read that the females start appearing about a week later. They never did.
The directions on my
seed packet said to thin the vines down to just one per mound. I did not have the heart to pull healthy plants and left several per mound, as you did. That, and the heat, is something we had in common. Maybe the roots were crowded and competing for water and nutrients?
Also, I thought I was planting in full sun when I put in the
seeds, but I realized later that the area got dappled shade for a good part of the day. I'm sure that had something to do with my problem as well.
I am going to try again this year, and will follow the directions to a "T."
My daughter wants her own pumpkins and I will not give up until we've grown at least one!!
Post an update and if you're trying again this year!