Is it good to put Def in fuel tank?
The downside is that if you’re not familiar with what’s under your hood, you might think you’re supposed to add DEF to the fuel tank. DEF is a great automotive advance — it leads to cleaner diesel emissions and better fuel economy. Just be sure to keep it in the right tank.
What happens if you mix Def and diesel?
DEF and diesel should never be mixed. Ever. Although safeguards have been designed to keep the diesel fuel separate from the DEF, it still happens: DEF is accidently put into the diesel tank or diesel into the DEF tank. When it does, it’s more than just a little problem: It can lead to significant damage and costly repairs.
What happens if you accidentally put Diesel in your tank?
Image adapted from © Photo by Kickaffe (CC BY-SA 4.0) Generally speaking, accidentally putting diesel into your AdBlue™ tank is unlikely as the AdBlue™ fill point is designed for a smaller spout nozzle (19mm), making it impossible for larger diameter diesel spouts to fit. The other way round however has become a common problem.
How much does it cost to repair a Def contaminated fuel system?
The recommend repair is to replace the entire fuel system, from tank to injectors. We’ve seen reports of Ford dealerships quoting between $12,000 and $20,000 to replace a DEF-contaminated fuel system.
What happens if you put Def in the fuel tank?
Damage to a diesel can be linked directly to the amount of DEF allowed into the fuel system. Only a teaspoon and the system may be OK. More than that and the engine will be in trouble. DEF is denser than diesel fuel and will settle to the bottom of the fuel tank. DEF will rust the tank, further contaminating the system.
DEF and diesel should never be mixed. Ever. Although safeguards have been designed to keep the diesel fuel separate from the DEF, it still happens: DEF is accidently put into the diesel tank or diesel into the DEF tank. When it does, it’s more than just a little problem: It can lead to significant damage and costly repairs.
What to do with small amount of Def?
Most operators consider a small amount of DEF will be so diluted by the fuel it cannot damage the engine. This assumption could be a risky and expensive mistake. Depending on circumstances and the advice of diesel mechanics, change fuel filters immediately. Continue to replace all filters until the diesel fuel has been exhausted from the tank.
Can you use def fluid on an older diesel truck?
Don’t try to use DEF fluid on an older rig – it is ONLY for vehicles equipped with the SCR system. Although that may sound obvious, unknowing owners – and even well-meaning service station attendants and techs at non-diesel shops have thought that if DEF is so good for new diesel trucks, it should be good for older diesel as well.