7 Rev-5 Dec 2, 2019
FUELS
Natural gas and LPG are combustible gases, and can be explosive if
leaked and contained in a confined area. Keep cigarettes and all other
flame sources away from these areas.
If you can hear a fuel leak, shut off the fuel supply at the source
immediately and fix the leak or have it serviced. Check the entire fuel
supply line from the cylinder/tank to the engine for leaks with a soapy
water bubble mixture anytime a cylinder/tank is changed or the fuel
supply line is worked on. Fuel leaks should also be checked as part of
the regular engine maintenance.
Depending on your engine and fuel system configuration, your engine is
designed to run on natural gas and/or vapor LPG. The fuel requirements for
each are discussed below. See the "SPECIFICATIONS" section for the required
fuel supply pressures for each fuel.
Natural Gas
Your engine is certified to run on "pipeline-quality natural gas". EPA defines
pipeline-quality natural gas as being composed of at least 70% methane by
volume or having a heating value of 950-1100 BTUs per cubic foot. In addition,
pipeline-quality natural gas must be provided by a supplier through a pipeline.
If
your natural gas supply does not meet these specifications, your engine is
considered to be being operated as a non-certified engine. See "U.S. EPA Legal
Requirements" at the front of this manual.
LPG
In order to maintain emissions compliance and the engine warranty, use
commercial-grade HD-10 or better LPG.
Liquid LPG is drawn off of the bottom side of a LPG tank or cylinder and is a
liquid until it has passed through the regulator/vaporizer, at which point it is
vaporized to a gas. If you connect vapor LPG to a liquid LPG fuel system, you
may starve the engine for fuel, causing it to produce low power and excessive
emissions.
Vapor LPG is drawn off of the top side of a LPG tank or cylinder and is a gas
from the tank/cylinder through to the engine intake. If you connect liquid LPG to
a vapor LPG fuel system the fuel will not vaporize properly, causing the engine to
run rich, produce low power and excessive emissions.
Summary of Contents for NA428
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