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2016 Mack mp8

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I have a Mack truck mp8, has had problems getting fuel. The day before we put it in the shop it ran fine. Next morning it wouldn’t turn over, crunk over one time and made a loud noise. So i checked all the fuel lines on the fuel filter manifold, all seemed good. Also checked the coolant lines for blockage and both spit out fuel. Then pumped hand primer numerous times to build prime and still nothing. Next step was i changed the Manuel fuel pump and tried the hand primer again and the hand pump never got tight. It I’ll also run off of starter fluid as long as you spray the can then shuts off when you stop spraying. Need help!!!

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