An ideal, everyday fertilizer, in very small quantities for a pumpkin plant, depending on the time of year, would be something like 10-5-10. Lower phosphorous because it can build in the soil relatively quickly, but also to keep things like myco happy.
However, there are times I believe, later in the season you can go a little higher. This evening I gave the plants a small foliar application of 3-12-12 with some seaweed, humic acid and yucca in it. Like I mentioned previously, my last month of growing typically has not seen the weight gains that I think I should have got. This year I'm going to do a little more fertilizer for the last 30 days and see what that yields. This means feeding 5 times a week with small quantities to keep the plants going. Most of this will be applied to the soil.