Northern Lights — SP-10 Bleeding the Fuel System
Maintenance
From a Northern Lights operator's manual covering: M30, M38C3, M38C3F, M40C3F, M944. Check it applies to your exact model before use.
Applies to: Northern Lights M30, Northern Lights M38C3, Northern Lights M38C3F, Northern Lights M40C3F, Northern Lights M944
Before you start
- Escaping diesel fuel under pressure can penetrate skin causing serious personal injury; use cardboard or wood to search for leaks.
Procedure
- Loosen air vent plug on the fuel filter about 1-1/2 turns, covering the vent with a cloth.
- Turn priming pump cap counterclockwise to unlatch it and move plunger up and down.
- Close the air vent plug when no more air bubbles are seen in fuel flowing from the vent hole.
- To bleed at injection pump, loosen its air vent plug and pump; lock priming pump cap before closing vent plug.
- If engine does not start, loosen a fuel line at an injector and crank until pure fuel escapes, then tighten.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Air vent plug loosened about 1-1/2 turns
Full service-parts list: Northern Lights M30 →, Northern Lights M38C3 →, Northern Lights M38C3F →, Northern Lights M40C3F →, Northern Lights M944 →
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.