How to re­pair a Def-con­tam­i­nated fuel sys­tem

Ultimate Diesel Builder's Guide - - Contents -

Way back in the Septem­ber 2014 is­sue of our sis­ter mag­a­zine,

Diesel­world we talked about diesel ex­haust fluid (DEF), which is used as an ex­haust treat­ment in mod­ern diesel emis­sions sys­tems to re­duce the lev­els of ni­tro­gen ox­ide (NOX) in the ex­haust. Used prop­erly, DEF is a good thing—but used im­prop­erly, it can cause se­ri­ous (and se­ri­ously ex­pen­sive) prob­lems.

A quick Web search will turn up nu­mer­ous (and, to some, hu­mor­ous) tales of folks putting DEF into their non-def trucks and cars. Typ­i­cally this hap­pens when some­one pours DEF into the fuel tank on older diesel rigs. We’ve heard sto­ries of ve­hi­cle own­ers who think that if DEF is so good for new diesel trucks, it should be good for their older diesel as well. Also to blame: well-mean­ing ser­vice sta­tion at­ten­dants, techs at non-diesel shops, and even own­ers of gas rigs hop­ing to reap the ben­e­fit of in­creased fuel econ­omy.

The truth, of course, is that DEF is only use­ful in a rig with a DEF sys­tem, which con­sists of a

DEF con­tam­i­na­tion of the fuel sys­tem causes urea crys­tals to form, as seen in this con­trol valve.

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