Let me know if I am wrong.....
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Fleet Mechanic
Joined: Dec 2012
Posts: 1,304
Likes: 93
Let me know if I am wrong.....
I had a customer today and he told me 6.7L contaminated DEF (diesel)repetitive problem (like every 3 months...he said), he said we couldn't fix it, another dealer told him they found a bad motor (cracked block?) was letting the diesel get into his DEF...??? 
I thought DEF went into exhaust system and only way to get diesel contamination was to take off cap and pour it in. the diesel in the engine has no way to get into the DEF tank and the only time DEF and diesel are anywhere near each other is being fed into exhaust from different source lines... Am I wrong??
Thanks
I thought DEF went into exhaust system and only way to get diesel contamination was to take off cap and pour it in. the diesel in the engine has no way to get into the DEF tank and the only time DEF and diesel are anywhere near each other is being fed into exhaust from different source lines... Am I wrong??
Thanks
Post Fiend
Joined: Mar 2013
Posts: 5,929
Likes: 287
From: EC Iowa
Truckie, I can't think of any way to possibly get diesel into the Def other than simly putting it in the Def tank by accident. Or vandalism.
You are correct, Def only gets injected in the Exhaust system, not in the motor.
You are correct, Def only gets injected in the Exhaust system, not in the motor.
Elder User
Joined: Jul 2010
Posts: 501
Likes: 1
From: Pacific NW
Wow, that makes no sense at all. Def is housed in a separate tank and is only routed to the exhaust. The only thing engine-related I can think of, doesn't ford route coolant to the DEF tank for defrosting purposes? But other than that, there's no interface between diesel and DEF except in the decomposition chamber where the DEF is injected into the exhaust stream.....
Or is this the case where DEF is getting into the diesel tank? If so, I'd also be a little lost on how that's happening aside from somebody pouring DEF straight into the diesel tank.
Either way, a cracked block/bad motor would not cause diesel to flow into the DEF tank.
Or is this the case where DEF is getting into the diesel tank? If so, I'd also be a little lost on how that's happening aside from somebody pouring DEF straight into the diesel tank.
Either way, a cracked block/bad motor would not cause diesel to flow into the DEF tank.
Thread Starter
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Fleet Mechanic
Joined: Dec 2012
Posts: 1,304
Likes: 93
he told me diesel in DEF.... I told him I didn't think it was physically possible...
he did tell me he asked his employee if he had put diesel in DEF by mistake and the employee said "NO" LOL....
the 3 month interval tells me the employee did it ... but maybe I am wrong.... maybe there is a way for it to happen...
he did tell me he asked his employee if he had put diesel in DEF by mistake and the employee said "NO" LOL....
the 3 month interval tells me the employee did it ... but maybe I am wrong.... maybe there is a way for it to happen...
Lead Driver
Joined: Feb 2005
Posts: 7,925
Likes: 2,643
From: The Great State of Texas
Wow, that makes no sense at all. Def is housed in a separate tank and is only routed to the exhaust. The only thing engine-related I can think of, doesn't ford route coolant to the DEF tank for defrosting purposes? But other than that, there's no interface between diesel and DEF except in the decomposition chamber where the DEF is injected into the exhaust stream.....
Or is this the case where DEF is getting into the diesel tank? If so, I'd also be a little lost on how that's happening aside from somebody pouring DEF straight into the diesel tank.
Either way, a cracked block/bad motor would not cause diesel to flow into the DEF tank.
Or is this the case where DEF is getting into the diesel tank? If so, I'd also be a little lost on how that's happening aside from somebody pouring DEF straight into the diesel tank.
Either way, a cracked block/bad motor would not cause diesel to flow into the DEF tank.
Post Fiend
Joined: Mar 2013
Posts: 5,929
Likes: 287
From: EC Iowa
he told me diesel in DEF.... I told him I didn't think it was physically possible...
he did tell me he asked his employee if he had put diesel in DEF by mistake and the employee said "NO" LOL....
the 3 month interval tells me the employee did it ... but maybe I am wrong.... maybe there is a way for it to happen...
he did tell me he asked his employee if he had put diesel in DEF by mistake and the employee said "NO" LOL....
the 3 month interval tells me the employee did it ... but maybe I am wrong.... maybe there is a way for it to happen...
Fleet Mechanic
Joined: Oct 2006
Posts: 1,522
Likes: 5
From: Las Vegas
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Senior User
Joined: Nov 2009
Posts: 233
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From: SC
he told me diesel in DEF.... I told him I didn't think it was physically possible...
he did tell me he asked his employee if he had put diesel in DEF by mistake and the employee said "NO" LOL....
the 3 month interval tells me the employee did it ... but maybe I am wrong.... maybe there is a way for it to happen...
he did tell me he asked his employee if he had put diesel in DEF by mistake and the employee said "NO" LOL....
the 3 month interval tells me the employee did it ... but maybe I am wrong.... maybe there is a way for it to happen...
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