Owner`s manual
19 20
Q: What is the difference between LP Vapor and LP Liquid Fuel
Systems?
A: LP V
apor Withdrawal — With a vapor withdrawal system, the LP fuel is
vaporized in the fuel tank by heat input from the environment. The pressure
is reduced to about 11-inches of water column (0.4 psi) at the tank outlet
with a regulator. The vaporized LP fuel fl ows to the demand regulator on the
generator, which reduces the pressure before it enters the carburetor.
LP Liquid Withdrawal — With a liquid withdrawal system, liquid LP fuel fl ows at
tank pressure to the generator where heat from the generator converts the fuel
from liquid to vapor form. A two-stage regulator reduces fuel pressure before it
enters the carburetor.
Q: What are the advantages of each type of LP fuel system?
A: LP Vapor Withdrawal
• Simpler system for the generator set.
• Same low-pressure vapor system as other appliances.
LP Liquid Withdrawal
• Better operation in cold temperatures.
• Complete vaporization pressure regulation system is on the generator from
the factory.
Q: Can LP fuel plug up the regulator?
A: The most common contaminants found in LP fuel ar
e the oils from the LP
pumping facility. The oil is removed from LP fuel at the location the fuel
vaporizes. In liquid withdrawal LP fuel systems, this occurs in the regulator. Oil
contaminants can then clog the regulator. The Cummins Onan QG models’
liquid withdrawal LP fuel systems provide a drain for oil removal. See your
Cummins Onan Authorized RV Service and Parts Dealer for assistance.
External Muffl er Generators
Q: Is the muffl er included on or with the RV QG RM generator?
A: No. Requir
ed muffl er kits are available for each RV QG RM. See your distributor
for more information on proper application for each kit.
Q: How many appliances can I operate with my RV QG RM 2800 or
RV QG RM 2500 LP generator?
A: The R
V QG RM 2800 can run a 13500 BTU air conditioner with 600-watts of
power in reserve. In most trailers and truck campers, that is enough reserve
to operate the DC converter (for TV, lights, fans, battery charger) in addition to
the air conditioner. The 2500 LP model has slightly less reserve but still enough
power for an air conditioner plus converter loads. With the AC off, both RV QG
RM generators can operate any mix of standard RV appliances (i.e. microwave,
coffee maker, hairdryer, etc.) up to the rated capacity.
Electronic Fuel Injection (EFI) Generators
Q: How reliable is the technology for electronic fuel injection?
Will I have more problems?
A: No, you won‘t have mor
e problems. Actually, you’ll have less. The EFI
technology used in our RV QG models is the same technology used in the
automotive industry for over 10 years.
Q: Should I worry about gumming of the fuel system with my
EFI generator?
A: No. Y
our EFI generator minimizes fuel system gumming. This will minimize
maintenance and service requirements, and make storage of your RV much
simpler.
Q: Does a generator with EFI start better?
A: The R
V QG generator is much faster and more reliable in both hot and cold
starting. This will result in fewer start failures.
Q: Do I have to adjust for altitude and temperature with EFI?
A: No, the R
V QG EFI generator has automatic altitude and temperature
compensation.