My CO truck, a 2021 p b. 579, suddenly started having trouble going uphill loaded. I have a cel and am told it's " turbo regulator" which was replaced 4 month ago. And an egr issue. I know that one problem will trigger another. But just B4 this started, I filled the truck with diesel and def. I noticed the def cap was under vacuum. When you pull it off ,there's the sound of air rushing in. I've never seen that B4. Everytime I stop I pull the cap and it's under vacuum I wonder if that's a symptom of one of those cel issues or a def tank not venting is causing the codes. I'll take it to a rush or Peterbilt shop but I'm in California getting a load to Utah and need to get over the Sierra's. I'd like to finish the trip. Thinking about running the cap loose.
Def tank vent
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by snicrep, Nov 6, 2024.
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Don’t take it to Rush..why waste your money.
My “Pride In Crap” Peterbilt 2021 & 2023
Clog up the vent tube constantly. Just pop the rubber boot off the top of the tank and clear the vent. Pull the tube out carefully because there’s a cheap crap plastic 90 degree connected to the tube. The tube and 90 are one piece (90 is glued to the tube I believe) and that’s how you order a replacement if the 90 breaks.
I’ve learned to just keep the tube removed and keep my DEF tank around 3/4..mine is 30 gallons so it’s not a big deal for me. If you keep it full it’ll just slosh around and clog the whole within a week or so.
Once you remove the tube find something small (I use a small Phillips screwdriver) and push it down the hole to clear it.
That’s it, welcome to Paccar life
Big Road Skateboard and D.Tibbitt Thank this. -
Don’t run the cap lose it fall off and if you don’t have the rubber leash anymore you’ll be buying another cap…They aren’t cheap I learned that lesson already
Big Road Skateboard Thanks this. -
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