Car will not start when hot

have your fuel pump relay checked

Have you checked to see if you have power to the starter post when the key switch is in the start position ?

if a mercedes

Check the Fuel Pump Relay. behind the battery next to the OVP Over Voltage Protection Relay. They do fail. Occasionally the engine will not start when hot. This becomes more frequent until you are left stranded. If you are comfortable with jumping two terminals you can jump terminals 7 & 8 test the relay. if the car starts your Fuel pump relay is bad.

Ignition module

Had a car do that before and it was the injector on a throttle bodied 4tec. my check your injectors. First place I would start.

sometimes when the starter gets hot it won't allow the Bendix to engage properly.

What kind of car/truck,what engine?????????

After you kill it, when you try to start it back up, does the starter turn the motor? Or is it froze up (will not turn over)?

Sounds like you might have a faulty ignition switch and ignition lock cylinder.These cars are known for the ignition switches getting hot and then they won't start.

if it turns over there are a cocuple of things to check. crankshaft sensor and the coil pack maybe the computer.id start with the crankshaft sensor