i have a mercedes c320 and it runs fine for about twenty mins then it cuts off and wont crank for about twenty mins. ive replaced the mass air flow sensor fuel filter and catalytic converters...someone plz help...

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Is the check engine light on? It is possible that the crankshaft position sensor is not working properly. I would recommend that you use a obd2 scanner to read the trouble codes from the ECU.

well i know its got something to do with the fuel cause i can pour gas into the intake and it runs fine until it burns it off
... its funny cause if i let it sit for twenty mins it will crank back up and run for twenty min

Sounds like there is an issue with the fuel pump. I would get a pressure gauge and connect it to the fuel rail to get a pressure. It's a very easy procedure and takes only 5 min. Check it when the car is refusing to start. I suspect the brushes for the fuel pump in the gas tank are on their way out. That's why you only see the problem at random. To replace the fuel pump you will need to remove the rear seat. It's not that hard but you need the right tool to remove the larg o-ring on top of the fuel pump.

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