Apparently the particular pump utilized at your place of purchase required the DEF magnet. It's labeled as a MFPD (mis-fill prevention device) and will only allow full flow if the DEF tank on larger trucks already has the magnet within the filler neck; otherwise, the magnet must be slipped over the nozzle for full DEF dispensing.I bought some DEF at the local Loves truck stop. Less than $2.50 a gallon. But had to ground the nozzle with an adaptor. It took awhile, and was a bit messy. Has anyone tried this? Or any better ideas?
Apparently the particular pump utilized at your place of purchase required the DEF magnet. It's labeled as a MFPD (mis-fill prevention device) and will only allow full flow if the DEF tank on larger trucks already has the magnet within the filler neck; otherwise, the magnet must be slipped over the nozzle for full DEF dispensing.
http://www.opwglobal.com/Product.aspx?pid=472
I've purchased DEF bulk at 14 or more places and have only encountered one place that required the magnet.
According to Chrysler TSB 25-006-13:
Temperature Estimated Useful Life
95°F (35°C) 10 Months
104°F (40°C) 4 Months
122°F (50°C) 1 Month
I think either the Cummins or Chrysler rep at May Madness said that in cases of severe evaporation due to high heat, crystals can form in the DEF tank and dosing system resulting in clogs or damage. Also, I recall he may have mentioned contamination of the SCR unit can result.So my question is: what if anything happens when the DEF in the truck 'goes bad' due to heat?