I have a 1975 Mercury Colony Park wagon. I put on a new timeing set & water pump, then I drove it around town for two hours no problem until I put the peddle to the floor. My 460 stopped. No loud noise or anythink. I found no fuel going to the carb ; so I replaced the fuel pump. Still the same problem, no gas to the carb & yes there is gas in the tank. What should I look for next?