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Me_Again's avatar
Me_Again
Explorer III
Sep 25, 2018

Leaky Peak Blue DEF box solution!

I put another 2.5 gal Peak Blue DEF in the RAM yesterday using my theory of why they leak. The last two or three boxes I have put in did not leak, drip or have other issues.

When you screw on the spout the little black duckbill vent ends up at the near side of the box(not the center of the box). So to use the box extend the spout and tip the box up with this vent of the high side(like upside down). The vent lets air in from the high side of the spout to replace the DEF exiting without leaking a drop. As the box empties it gets raised up to have the near side flat to the side of the truck.

To say it another way, pour from the high side not the low side!

Try it, you will like it.

Chris

27 Replies

  • If you get bad DEF, which one Walmart or Peak is going to step up to the plate and help you? 2 or 3 bucks over hundreds of miles is not a big deal.
  • Ron3rd's avatar
    Ron3rd
    Explorer III
    Just curious why people buy Peak instead of the Walmart brand. Same thing
  • My filling process for using the Peak DEF fluid is very simple utilizing these 3 simple steps.

    Step 1 Throw away the nozzle provided in the DEF box
    Step 2 Connect my Ford Motorcraft DEF fluid nozzle and snap the nozzle to the DEF fill port.
    Step 3 Poor the DEF fluid until the fluid doesn't flow anymore. Which means the tank is full.

    The Ford Motorcraft nozzle is a excellent design that will not allow a over fill and spill condition and I never spill a drop.

    Link
  • Going to a DEF pump seems like an even more elegant solution for a lot of reasons.
  • A lot of containers are designed to be poured in not-so-obvious ways. Take your average everyday quart of oil, for example. It's meant to be poured with the neck to the high side. This allows you to have the bottle at almost a 90 degree angle to the funnel before any oil comes out, so it doesn't dribble down the side of the bottle. Common antifreeze jugs are meant to be poured on their sides for a similar reason.