Truck will only go about 3 miles before quitting. I have cleaned the battery cables, just replaced both batteries, have replaced fuel filter. It leaves no DTC's but sometimes it won't restart and when that happens it is not turning the air dog back on based on in cab pressure gauge. I also tried swapping the relay for the air dog, still no luck. Any ideas with no DTC I don't know where else to go. TIA Jason

 

Have you checked all the connections for the Airdog? Have you just let it idle to see if it dies or is it only when driving?

 

have u had an injector line break recently? if so im thinking connector tube nut is loose.