Northern Lights NL673 — Bleeding Fuel System
Maintenance · fuel_system
For the Northern Lights NL673, from the Northern Lights operator's manual.
Applies to: Northern Lights NL673
Before you start
- Escaping diesel fuel under pressure can penetrate skin causing serious personal injury.
Procedure
- System is self-bleeding but needs manual bleeding after filter change, running out of fuel, or component removal.
- Loosen bleed screw A on top of filter.
- Pump hand primer B until pure fuel escapes from screw A, then tighten A.
- Loosen bleed screw C; pump hand primer B until pure fuel escapes.
- If engine does not start, loosen a fuel line at injector.
- Crank engine until pure fuel escapes; tighten connection.
- Do each line one at a time.
- After starting, check for leaks using cardboard.
Tools required
- cardboard 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 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.