Ultra low sulfur diesel (ULSD) is the product of an EPA mandate to lower the sulfur content in fuel for cleaner emissions.  What this means to the RV owner is that if there is a ULSD sticker attached to the engine, ultra low sulfur diesel fuel is required.

In the year 2010, ULSD will be the only fuel available for highway use.  At this time, ULSD is available in most of the US and Canada, but supplies are limited in Mexico.  The use of regular diesel in a ULSD rated engine may damage the system over time.  Change the filters as soon as possible if regular diesel is put into a ULSD rated engine.  All diesel fuel pumps are required to display a label specifying the fuel type.  Check the pump label with the vehicle label to be sure they are consistent with the engine warranty.

What fuel is used will determine what type of oil is required.  New lubrication oils designed specifically for use in a ULSD rated engine can also be used in older engine models, but the service schedule will need to be revised.

The Particulate Filter installed in the system is designed to remove particles by converting the soot into an invisible gas.  If the system is collecting soot faster than it can be expelled, a DPF indicator will illuminate at the dash.  This is not a warning to stop driving.  Instead, drive at a steady speed of 40 mph until light extinguishes.

Biodiesel is similar to diesel fuel, but is the product of renewable sources.  Lower emissions and improved fuel lubricity are a few of the benefits of biodiesel.  Reduced fuel economy, low temperature performance and a decreased shelf life that leads to plugged filters are some of the downsides of biodiesel.  Additionally, older fuel system elements, such as seals and hoses, may not be compatible to biodiesel.  Check with your engine manufacturer for the acceptable percentage of biodiesel blend, and the revised oil and filter maintenance schedule, if any, to assure that the use of biodiesel will not void the warranty.

While traveling in cold weather regions it is recommended to use a winter blend fuel that is available at most major fuel stations.  If you plan to be in severe cold temperatures (-13 or lower) for a prolonged period of time, it is advisable to use additional winter products such as heaters, warming blankets, pads, synthetic oils, etc.  Contact the engine manufacturer for specific information on how to protect your fuel system in cold weather.

If you carry spare fuel filters in the RV, be sure they are not opened prior to use in order to remain dust free.

When the tank cap is removed to add fuel you may encounter a pressure build up.  The sound of air coming from the fuel tank could indicate a blocked vent tube.  The end of the fuel tank vent tube is located on the curbside, at the bottom of the fuel tank.  If there is a clog at this hose due to dirt, debris or insect nests, insert a wire into the tube to break up the clog.  If the build up can not be removed, the vent tube will need to be replaced.