RAYSTRASH Posted January 3, 2014 Share Posted January 3, 2014 Our 2009 MRU with and MP7, we pressure tested the cooling system and took off the return lines on the fuel tank and fluid (coolant/fuel) was coming out of the return lines. Is this normal, or would it be a sign of bad injector cups? Or could it be something else. Where else should I look? I have new sets of cups and O-rings, but if I don't have to use them, I will send them back. Quote Link to comment https://www.bigmacktrucks.com/topic/34105-2009-mru-w-mp7-coolant-in-fuel/ Share on other sites More sharing options...
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