I did a test run of the City Bakery pumpkin pie using the following recipe but it is too soft and runny. Any ideas on how I can firm it up? http://latimesblogs.latimes.com/dailydish/2009/10/because-you-asked-a-pumpkin-pie-recipe.html
You could add another egg to the filling.
Have you allowed it to cool completely and it is still runny? If not it will likely firm up as it cools. Otherwise as Amanda said. A few more mins. in the oven should also help.