Northern Lights L6125 — Bleeding Fuel System
Maintenance
For the Northern Lights L6125, from the Northern Lights operator's manual.
Applies to: Northern Lights L6125, Northern Lights L6125H engine
Before you start
- Escaping diesel fuel under pressure can penetrate skin; relieve pressure before disconnecting lines.
- Due to High Pressure Common Rail design, open valve C on bottom of water separator bowl to relieve pressure before removing filters.
Procedure
- Normally use hand primer; if engine ran out of fuel or system has air, use special tool #53-50005.
- Open drain valve on fuel filter and use hand primer to drain water and contaminants.
- Attach open line to diagnostic port above hand primer; put line end in diesel fuel container.
- Pump hand primer until steady flow of fuel without bubbles comes out.
- Disconnect line from diagnostic port.
- Close return line.
- Pump primer until firm.
- Crank engine until it starts; 15 seconds maximum, 60 seconds rest.
- Open return line.
Tools required
- Special tool #53-50005 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Northern Lights L6125 →
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.