I have a 2001 super crew that will not start after warming up. I will start after turning off the first few times. then after shutting off it will not start. the first few times it started after cooling off about an hour. The last time it would not start until sitting overnight. Then it starts fine. This does not happen everytime it warms up.

 

Exactly what is happening? Can you hear the fuel pump when key is turned to on? Does the starter motor crank over the engine? Have you checked for spark during this no start period? Need some more input!

 

Maybe a bad thermostat?

 

the starter is turning. it is cranking like it wants to start. I will have to check the fuel pump when I can get it to fail to start again. no I haven'. i havent checked for spark. what is the best way to listen for the fuel pump?

 

When key is turned to on, the pump will run for about 2 seconds. Have it quiet in the truck, no radio, doors closed, and seat belt on is the best way to avoid the distraction of all the bells. There will be a humming sound, keep cycling the switch off to on and you will hear it. If a pressure gauge is available there is a schraeder valve on the fuel rail on top of the injectors. 30-40 PSI.