THermo-tec products as heat protection to avoid percolation under hood

 Along with the float bowls and intake (I don't think the problem is with the intake temp), measure all the fuel line temps (every foot or so, return lines too) under the hood, including the mech. f. pump if it's still there, and go as far into the tunnel as possible. Remember, the boiling point of fuel is lower than water. The results should be interesting.