Priming a fuel system - Mercedes Forum - Mercedes Benz Enthusiast Forums

Mercedes CLS Class CLS500 Coupe.

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Old 12-09-2013, 12:00 PM
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Default Priming a fuel system

I have a 2006 CLS 500. The fuel pump was bad, and I replaced the pump and sending unit. The pump and the sending unit are working fine, but the car won't crank now.

The dealer said the car should start right up, but I'm thinking I need to prime the pump and the fuel system, but I don't know how to do so.

Does anyone know how to prime the fuel system, or what could be the problem at this point. The relay and fuses are all good.
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Old 08-28-2016, 08:43 PM
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Priming the fuel system consists of turning the key on and off without actually starting the vehicle. You don't need to prime the fuel system. If there is no fuel in the rails it will crank a little longer but it should start.
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