Cummins/Onan — Fuel Line Connection
Installation · Fuel system
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan HDKA, Cummins/Onan HDKAQ, Cummins/Onan HDKAR
Before you start
- Fuel presents hazard of fire or explosion.
- Never use galvanized or copper fuel lines, fittings or fuel tanks with diesel fuel systems.
Procedure
- Route fuel line separate from electrical wires or separate with conduit or other sheathing.
- Use fuel hose fittings for fuel tank pickup line (to fuel pump) and return line (from injectors).
- Use protective sleeving over frame rails; protect holes with rubber grommets.
- Secure fuel line every 18 inches.
- Connect fuel lines to bulkhead connectors.
- Do not tee into existing fuel lines used for vehicle propulsion engine operation.
Specs & values
- Secure fuel line every 18 inches.
Full service-parts list: Cummins/Onan HDKA →, Cummins/Onan HDKAQ →, Cummins/Onan HDKAR →
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.