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Message: <blockquote data-quote="philipac" data-source="post: 1041033" data-attributes="member: 75638"><p>so update, was at orileys last night and my truck overheated. the light that says check gauges came on and it said it was overheating but i pulled over and felt the radiator... cool to the touch. my 18 year old brain said "ooo its working better than usual" instead of "that really shouldn't be that cool" but i continued on to orileys where i found out the radiator was cold because there wasn't a drop of coolant in it.  thank god it was at a parts store. i tried filling it and discovered that my water pump had a bad leak. could running it without any coolant in it have been causing the mpg drop and the fuel rail pressure high code? pretty sure i haven't had coolant in it for a while considering that the radiator has a small crack that constantly leaks and i haven't checked it in a while(been working my but off so i can afford to fix all of its other problems and haven't had too much time to check).     basically im asking if no coolant may be the cause of at least most the other things i mentioned like mpg and fuel rail pressure</p></blockquote><p></p>