Disel Exhaust Fluid

Millennium Luxury Coaches DEF Inlet Modification Stands Up To Prevost Inspections; Sets the groundwork for Prevost engineers to develop an OEM solution for their entire product line

Prevost engineers & management were recently present at Millennium Luxury Coaches’ manufacturing and sales facility in Central Florida for an inspection and review of the company’s controversial modification to relocate the Diesel Exhaust Fluid inlet to the drivers side of the coach. The opposing locations of the inlets and the pumps have provided challenges to owners of new Prevost coaches.

Millennium Luxury Coaches, which converts exclusively Prevost chassis, took action. According to Nelson Figueroa, President of Millennium, “After four revisions and countless hours at the fuel pump we have developed the only successful relocation of the inlet fill port for the Prevost DEF system.”
While there was little dispute that Millennium’s relocation worked, many in the industry doubted whether Prevost’s warranty would still remain intact after such a modification. A team of Prevost engineers and Senior Management, after an onsite visit and thorough inspection, determined that the Prevost warranty on DEF relocated Millennium coaches would not be affected.

What is Diesel Exhaust Fluid or DEF?

Diesel Exhaust Fluid (DEF) is a new product required by many heavy-duty trucks, pickups, SUVs, vans and of course, RV’s delivered after January 2010. DEF is used to destroy harmful emissions in the exhaust and meet the EPA’s latest strict environmental standards. Diesel Exhaust Fluid is an aqueous urea solution blended with 32.5% high purity urea and 67.5% deionized water. DEF solution is used in Selective Catalytic Reduction (SCR) to lower NOx concentration in the exhaust emissions of diesel engines.The solution may also be referred to as AUS32 or as AdBlue, a trademark held by the German Association of the Automobile Industry (VDA), which ensures quality standards are maintained in accord with ISO 22241 specifications.
Diesel Exhaust Fluid

How it works

As explained by the American Trucking Association (ATA), “To reduce NOx, a small amount of DEF is injected directly into the exhaust upstream of a catalyst. The DEF vaporizes and decomposes to form ammonia (NH3), which in conjunction with the SCR catalyst, reacts with NOx to convert the pollutant into nitrogen (N2) and water (H2O).” Basically, DEF takes pollutants from Diesel exhaust and makes it much less harmful to the environment.

What are the advantages

Heavy duty engines utilizing SCR will provide substantial fuel economy improvement, up to 5%. SCR catalyst technology allows much greater NOx conversion efficiency, thereby allowing the engine to be fully optimized, which contributes to this fuel economy improvement. Another benefit to the improved fuel consumption is less frequent Diesel Particulate Filter (DPF) cleanout, thereby further reducing costs.

Millennium Overcomes

The challenge we faced this past year was the lack of sufficient pumps around the country. However as more pumps became available it was realized too late that the pumps were being installed on the driver side while the fill inlet was installed on the passenger side of the coach. This became an immediate inconvenience to the motor coach community as customers with EPA 2010 engines would have to add DEF manually via off the shelf 2.5 gallon containers. In addition to the higher cost, about 4 times as much, this method of filling the coach was inefficient and inconvenient. It did not take long for Millennium to realize that something needed to be done about it. The DEF fill inlet needed to be relocated.

Millenniums initial round of questioning was met with a lot of resistance from various organizations. “We decided as a company to take on the challenge and find the solution ourselves” said Nelson Figueroa, President of Millennium Luxury Coaches. “Our engineering team looked at the mechanical installation and began to brainstorm ideas. We understood the challenge for the industry and found that other sectors of commercial vehicle fabrication had the same challenge.” Chassis manufacturers had issues determining the placement of the inlet port because chassis could be turned into all kinds of different vehicles from ambulances to fire trucks and motor homes. Thankfully, Millennium uses the best commercial grade incomplete vehicle for our conversions. After four revisions and countless hours at the fuel pump we have developed the only successful relocation of the inlet fill port for the Prevost DEF system.

After turning some heads of Millenniums competitors (which are still filling on the wrong side) Prevost asked if they could come down to Florida to look over the installation. The Millennium team spent two days with Prevost engineers, management and service personnel examining a video taken at the pump of an actual DEF dispensing test and also looking at the logic and mechanical implementation of the new inlet port. They looked at angles and vents as well as the pros and cons, hoses and fill ports and in the end it was unanimous, Millennium had done it! Thumbs up for Millennium! Prevost is now using Millennium’s model as a basis to develop the long term solution for the complete product line.