General Motors 4.3L GM Engine — Replacing the Fuel Filter
Maintenance · In-line LPG fuel filter
For the General Motors 4.3L GM Engine, from the General Motors service manual.
Before you start
- A small amount of fuel may remain in the fuel line - use gloves and eye protection; liquid LPG may be present.
Procedure
- Move equipment to a well ventilated area free of sparks, ignition and heat sources.
- Start the engine.
- Close the manual valve.
- When engine stalls, turn ignition OFF and disconnect the battery negative cable.
- Slowly loosen and disconnect the inlet fitting.
- Slowly loosen and disconnect the outlet fitting.
- Remove the filter housing from the equipment.
- Check for contamination; tap the opening of the filter on a clean cloth; check for debris.
- Check canister for proper mounting direction.
- Reinstall filter housing; tighten inlet and outlet fittings to specification.
- Open the manual valve slowly (excess flow check valve).
- Check for leaks at fittings using soapy solution or electronic leak detector; repair if needed.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Tighten inlet and outlet fittings to specification
Source: General Motors 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.