When approaching my truck to leave my job today, i noticed a large stain on the pavement. I started the truck, looked underneath and fuel was gushing out like it was being poured out of a bucket. I moved to dry pavement, cut it off and crawled under it. Fuel was dripping from the back of the engine, mainly from the area around the starter and away from the fuel lines. I did not see a specific source so i started it again, this time only drips. I drove home, pulling over to check it a couple of times.
At home, it is wet in the valley but not gushing while running. It is damp all around the fuel bowl but not on the hood blanket.

I am thinking O rings for the back of the bowl.

What do you guys think caused the gush of fuel? What other parts should i suspect?