Northern Lights NL673 — Bleeding the Fuel System (SP10)
Maintenance
For the Northern Lights NL673, from the Northern Lights owner's manual.
Applies to: Northern Lights NL673
Before you start
- Escaping diesel fuel under pressure can penetrate skin causing serious personal injury; relieve all pressure before disconnecting lines.
- Never use hands to search for suspected leaks.
Procedure
- Loosen bleed screw A on top of the filter.
- Pump hand primer B on the fuel lift pump until pure fuel (no bubbles) escapes; tighten bleed screw A.
- Loosen bleed screw C; pump hand primer B until pure fuel escapes.
- If engine will not start, loosen a fuel line at the injector, crank until pure fuel escapes, then tighten.
- After the engine has started, check for fuel leaks using a piece of cardboard.
Tools required
- Cardboard or wood for leak checking Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Northern Lights NL673 →
Source: Northern Lights owner'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.