Cummins/Onan — Fuel Pump Control AC Connections (120/240 VAC Conversion)
Installation · day tank fuel pump control
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DFHA, Cummins/Onan DFHB, Cummins/Onan DFHC, Cummins/Onan DFHD, Cummins/Onan QST30 engine
Before you start
- Diesel fuel is highly combustible; improper installation can lead to spillage and loss of life and property.
Procedure
- To convert 240 VAC to 120 VAC: remove jumpers between TB1-6 and TB1-7 and connect one between TB1-5/TB1-6 and one between TB1-7/TB1-8.
- Move selector switch S103 on the control PCB to the up position for 120V.
- If equipped with a transformer, remove jumpers between H2 and H3 and connect one between H1/H3 and one between H2/H4.
- To convert 120 VAC to 240 VAC: remove jumpers between TB1-5/TB1-6 and TB1-7/TB1-8 and connect two jumpers between TB1-6 and TB1-7.
- Move selector switch S103 on the control PCB to the down position for 240 VAC.
- If equipped with a transformer, remove jumpers between H1/H3 and H2/H4 and connect two jumpers between H2 and H3.
- Attach a tag to the control box indicating the supply voltage.
- Terminals TB1-8 and TB1-5 are available for a 120 or 240 VAC electric fuel shutoff valve rated not more than 0.5 amps.
Specs & values
- Control factory set for 240 VAC
- Fuel shutoff valve rated not more than 0.5 amps
Full service-parts list: Cummins/Onan DFHA →, Cummins/Onan DFHB →, Cummins/Onan DFHC →, Cummins/Onan DFHD →
Source: Cummins/Onan service 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.