I would advise against. I don't think it will add that pumpkin taste your looking for. Personally when I try any pumpkin beers I taste the spices, can't say I've ever had a beer that actually tasted like pumpkin, but that's just me. I made a pumpkin ale with over 6 lbs roasted pumpkin in 5 gal batch and I still only tasted spices. Did you use any type of spices?
"If you fail to plan, then you plan to fail"