Bob Vaughn wrote:
We were on our way to Alaska and were in BC and I went in to a NAPA auto parts store to purchase a jug of DEF the clerk warned me not to put it in the fuel tank. When I asked her why she was warning me she replied that the week before they had a guy come in with a new truck and bought jug and poured it into his fuel tank instead of the fill tube for it. He only made it to the corner before his truck quit. He had to purchase a new engine because the warranty would not cover that mistake....
I know someone who bought a new F-350 and did just that -- poured the DEF in the fuel tank. Needless to say, the $17,000 bill to rebuild the engine and a new high pressure fuel pump wasn't a happy thing.