We're so sorry about your pumpkins!
Several diseases can cause yellowing, browning, and wilting, such as fusarium crown rot. For this disease, check if the base of the plant, the crown, looks soft or brown. The roots may be decaying, too. Overwatering can encourage this disease.
Verticillium wilt might be another possibility.
You might also check for squash vine borers--these insects usually bore into the base of the stem--you might see a hole or debris sort of like sawdust at the entrance. Inside the stem will be a larva, which you should remove; cover the wounded stem with moist soil to help it to recover. For more information, see: http://www.almanac.com/content/squash-vine-borer
Also check for squash bugs: http://www.almanac.com/content/squash-bug
For best advice, we'd suggest that you take a sample to your county's Cooperative Extension service for analysis. For contact information, see: http://www.almanac.com/content/cooperative-extension-services
Meanwhile, you might peruse a bit more on the Internet, especially on Cooperative Extension sites. For example, the Cornell Cooperative Extension Service offers these pages:
Water pumpkins about an inch per week; more in hot weather. Good luck!
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