General Motors 4.3L GM Engine — Checking/Draining Oil Build-up in the EPR
Maintenance · Electronic Pressure Regulator (EPR)
For the General Motors 4.3L GM Engine, from the General Motors service manual.
Before you start
- Liquid LPG may be present when disconnecting fuel lines; perform in a well ventilated area.
Procedure
- Move equipment to a well ventilated area with no external ignition sources.
- Start the engine.
- With the engine running, close the manual valve.
- When engine runs out of fuel, turn key OFF and disconnect the negative battery cable.
- Slowly loosen the inlet fitting and disconnect.
- Loosen the hose clamp at the outlet hose fitting and remove the hose.
- Remove the Retaining Pin in the LPG Temperature Sensor and remove from the EPR.
- Remove the three EPR mounting bolts.
- Place a small receptacle in the engine compartment.
- Rotate EPR 90° so outlet fitting points down and drain the EPR.
- Inspect the secondary chamber for large dried particles and remove.
- Reinstall EPR with three retaining bolts and tighten to specification.
- Reinstall outlet fitting and secure with Retaining pin.
- Reconnect electrical connector until it clicks, then pull to confirm locked; connect vacuum line.
- Reconnect outlet hose and secure hose clamp.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Tighten EPR retaining bolts to specification; tighten fuel inlet connection 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.