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I did auxiliary tank test and had CEL come on when I was climbing up a hill on highway. Got it connected directly to the pump. The fuel in that tank was so hot I thought it would melt that plastic. So next thing is the pump I guess?

Thanks GTS! Truck has PTO that I have to use 4-6 hours per day. (Its like driving 35mph load) Its service truck. Does DPF has anything to do with this code? What do you mean tail pipe loaded, there is light coat of soot. Nothing abnormal I have no hard starts, or prolonged cranking. It idles...

Hello, 2008 Hino 165 4 cyl 117,000 miles plus idle 4-6 hours per day 1100rpm Getting P0087 code only on the highway driving at 55 and more uphill Air and Fuel filters changed (replaced 5 times in last 2 month) DEF dropped and washed and reinstalled. Less then 0.5 psi drop Dealer blamed...