THOR Jayco Precept 2021, Owner'S Manual

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Section 7: Fuel & Propane System
Diesel Fuel and Fill
It is critical to understand the danger associated with fuel. Take time to become educated
about the property of fuel and use it safely.
Fuel Selection
Use diesel fuel only.
The diesel generator and the Aqua Hot system (if so equipped) are
also fueled by the same system used to fuel the motorhome chassis engine. Consider the
fuel requirements of the generator and the Aqua Hot system (if so equipped) when making a
decision on the type of fuel to use.
DEF Fluid
Diesel engines (since 2010) require the use of DEF fluid (Diesel Exhaust Fluid) to aid in
burning particulate matter in the exhaust and reduce emissions to nitrogen and water. This
DEF fluid is kept in a separate heated tank and is required for the normal operation of the
diesel engine. DEF tank is typically located in one of the exterior compartments and the tank
will have a blue cap with “DEF” written on it. There will be a series of warnings at the dash
before running out of DEF fluid. If the vehicle is allowed to run out of DEF fluid, engine
power is intentionally reduced and speed will be limited to 5 MPH until the tank is re-filled
Automotive fuels can cause serious injury or death if misused or mishandled.
If you have further questions, consult your dealer or Customer Service for
assistance.
 Always shut OFF the vehicle engine while refueling.
 Do not bring or store fuel or other flammable liquids inside the mo -
torhome because a fire or explosion may result.
 Before refueling, extinguish all smoking materials and any open flames.
 Before refueling, always turn OFF all spark producing appliances (i.e.,
water heaters, furnaces, etc.).
 Do not overfill the fuel tank(s). The pressure in an overfilled fuel tank
may cause leakage and lead to fuel spray and/or fire.
 Fuel spills represent a serious fire hazard, and should be cleaned up im -
mediately.
 Never restart an engine or re-light any pilot lights while raw fuel is pres-
ent.
FAILURE TO COMPLY COULD RESULT IN FIRE, DEATH OR SERI-
OUS INJURY.
If you spill fuel on the motorhome, clean it up immediately. Fuel can dull or
soften paint and damage other surfaces.
NOTE: Check the diesel generator and chassis manufacturer’s informa -
tion to help you determine the type of diesel fuel best suited for this dual
application.
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