After driving my 91 firebird V6 for about 10 minutes and then turning it off for about 15 minutes it won't start, I installed a fuel pressure gauge with a bled line, the fuel pressure is about 39psi but when I relieve the pressure thru the bled line the fuel has bubbles and is very hot. Also the fuel return line is very hot, what could be the cause of this problem?

Your help would be appreciated!!