Cummins/Onan — Operating the Day Tank Controller (Fuel Transfer Pump)
Operation · Fuel transfer pump control
From a Cummins/Onan operator's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DQAD, Cummins/Onan DQAE, Cummins/Onan DQAF, Cummins/Onan QSM11 engine
Before you start
- Continued operation with a CRITICAL LOW FUEL fault can lead to a low fuel shutdown if the fuel level float switch fails.
Procedure
- Press the control ON switch for automatic operation. The green PUMP light comes on and the pump fills the tank.
- The tank level is automatically kept between pump-on and pump-off float gauge.
- When filling an empty tank, the red CRITICAL LOW FUEL and LOW FUEL lights come on when ON is pressed; this is normal and the lights turn off as the tank fills.
- The green PUMP light indicates when the pump is running, coming on and off to maintain proper level.
Specs & values
- LOW FUEL at approximately 62%
- HIGH FUEL at approximately 90%
- Overfill alarm at approximately 90% (fuel truck nozzle shutoff approximately 95%)
Full service-parts list: Cummins/Onan DQAD →, Cummins/Onan DQAE →, Cummins/Onan DQAF →
Source: Cummins/Onan operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.