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I have kia seranto 2.5d model 2005 which has a hard start and cuts off the engine after few km. At first i thought it was the heater plugs and the lift pump with the filter which was replaced with the originals from the dealers including new heater plugs, but still more even after the replacement i still have a hard start and engine cuts off after driving a few kms.

The fanny part is every time i want to start the engine i have to push it or use quick start ,and when its on idle the engine may still run for hours till i turn it off without switching itself, but
moment the vehicle is moved to the road it switches off within 2-3kms

What could it be the problem,and what i might i check now
 

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2009 Sportage, 98 Sportage, 2012 Tata Xenon, 1944 Jeep
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Have you replaced the front filter (the one between the lift pump and the high pressure rail pump). Next I would get the rail pressure and then the injectors checked. Also look for air leaks into the fuel system.
 
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