W202 c200 1999 model
SOURCE: Hard to start warm engine
Sounds like you have a problem with your fuel injectors, either they are working to much or not enough once they get warm....
Take it to a shop ant tell them you want the injectors tested.
SOURCE: Runs for 20 minutes, gets hot and shuts down. Still has spark
I had the same problem, took to a benz dealer, it was the fuel pump relay, cost for repair $200.
SOURCE: Power to fuel pump on 91 ford mustang cobra 5.0
The ignition module sends a "pip" signal to turn on the fuel pump and keep it running. If the signal is lost, or not present you get no pump. This is a safety in case of accident or other hazard in order to shut off the fuel so it wont keep pumping into a car with the key still on but engine disabled for some reason. Take the module to your local parts store and have it tested, for free to check.
SOURCE: 1998 chevy c15 5.7 SFI SYSTEM
My truck did this after I replaced the fuel pump. Turned out to Fuel Pressure Regulator. It would crank and crank but never start. It's located underneath the black plastic manifold on the side of the injectors.
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