Going from Gas To Diesel(?)

BEisler wrote:
I appreciate the debate regarding HP, but I have pretty much landed on going with the larger 340HP Cummins. Hopefully I will be more than satisfied.

Now, next questions. . . . can you educate me on the DEF tank? What is it? What does it do? What do I need to do with it? I googled it but always enjoy the practitioner input I get on this forum! Thanks

I think Holstein pretty much summed it up. Luckily, our chassis manufacturer just recently moved our DEF tank filler to the driver's side from the passenger rear location. So, we can fill at the truck pumps with ease.

Our DEF filler is behind the same door as the diesel filler right above and below each other. The diesel filler has a brass cover whereas the DEF has a blue plastic cover. You cannot put Diesel in the DEF tank because the opening is about as round as a quarter.

On the other hand, you could put the small DEF nozzle into the Diesel filler by mistake as it would fit. YOU DON'T WANT TO EVER DO THAT!
DEF in the engine would seize the fuel system up in a few miles. The whole fuel system would need to be replaced which could run close to $15,000 from what I've read.

As with anything, a mistake could happen but the fuel companies make it very obvious that each fuel handle is different and confusing them would be difficult.

I've only filled with DEF once in our new coach. We have a 16 gallon tank and I drove 2,300 miles on the first tank putting in just under 15 gallons. Looking at the receipt, it was $2.79 a gallon a month ago.

We have a 230 gallon fuel tank so I start looking for fuel at 1/2 a tank and try not to go below 1/4. I did let the DEF tank get fairly close to EMPTY but not close enough for any lights or warnings to come on.

Safe travels,
MM.