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Avensis 2003 2.0 D4D struggling to start problem.


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Hello everyone from greece! I have a problem with my avensis t25 with cdt250 diesel engine. When the engine stops running for about 4 hours or longer it struggles to start. If i first pump the diesel filter and then trying to start the engine it starts normally. If i dont do this its cranking for about 10 times and then starts. That means tha the fuel returns back to the tank. I have changed the suction control valve with a new denso but nothing changed. I have changed also the filter base with a new one and also the problem didnt fix. I cheched also for a broken fuel tank cap but its not the problem either. Also i chech for the common rail with an obd tester and it seems to work perfectly fine as it instantaneously increase the fuel pressure. It may be the diesel pump but i havent noticed any strange thing with it. Does anyone had the same or similar problem? 

Thanks for your time guys!!!

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Could it be the SCV from the pump? As they are responsible for the suction control?

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Yeah this is what i thought and i changed it as i said with a new denso but it wasn't it as nothing changed.


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