The Costa Rican said: "I felt fantastic when I scored that goal against Brazil in the World Cup but I was equally ecstatic with that header at Fulham on Saturday.
"I went a bit crazy with the celebrations and so do did the fans but it was a wonderful feeling. I said I wanted to repay City and the supporters for all their backing while I was out injured and that is hopefully just the first instalment."
Although City were lucky to grab a draw, the striker feels City should have taken three points from London. "We should have gone on to win but at least we saved a point which is encouraging.
"We didn't play as well as we can but we have shown again the determination and spirit we have in the side. We are a team and players showed they could take responsibility even when the likes of Nicolas Anelka and Steve McManaman are off the pitch."
But Wanchope warns City must stop giving themselves such a challenge: "If we want to be in the top six or even closer to the leading positions then those are the kind of games we have to win though one point is better than none when you are 2-1 down in injury time."