MQ Power WHISPERWATT DCA125SSIU4F Operation Manual page 39

3. NEVER overfill the fuel tank — It is important to read
the fuel gauge when filling the fuel tank. DO NOT wait
for fuel to rise in the filler neck (Figure 41).
FUEL GAUGE LOCATED
ON CONTROL PANEL
Figure 41. Full Fuel Tank
CAUTION
DO NOT OVERFILL the fuel system. Leave room for
fuel expansion. Fuel expands when heated (Figure 42).
Fuel EXPANDS
When Heated!
Figure 42. Fuel Expansion
DCA125SSIU4F 60 HZ GENERATOR • OPERATION MANUAL — REV. #6 (05/12/22) — PAGE 39
FUEL
LEVEL
INSPECTION/SETUP
DEF Refueling
NOTICE
ONLY fill the DEF tank with diesel exhaust fluid. Any
other type of fluid may cause severe engine damage.
Diesel exhaust fluid (DEF) is an aqueous solution made with
32.5% high purity urea (carbamide) and 67.5% deionized
water. DEF is used as a consumable in selective catalytic
reduction (SCR) in order to lower NO
diesel exhaust emissions.
1. Make the sure engine is OFF.
2. Remove the filler cap from the DEF tank (Figure 43).
125
DEF FILLER
Figure 43. DEF Tank Filling
3. Upon initial start-up, completely fill the DEF tank with
DEF fluid. DO NOT overfill.
DEF Refueling (Continuous Operation)
It is recommended to shut down the engine prior to refilling
the DEF tank. However, in special applications where shutdown
is not possible, it is recommended to ONLY refill the DEF tank
when the fluid level has been consumed down to 50%.
The DEF level sending unit requires a gradual DEF level
decrease during continuous operation to validate proper
operation. Failure of this sensor to report the decrease could
result in an engine shutdown. An engine service technician
would be required to remedy the shutdown.
concentration from
x
PORT
1 0 0
7 5
5 0
CAP
2 5
D E
0
F
T A
N K