General Motors 4.3L GM Engine — LPG Fuel System Pressure Relief
Maintenance
For the General Motors 4.3L GM Engine, from the General Motors service manual.
Before you start
- Residual vapor pressure will be present; ensure work area is well ventilated. Never use an open flame to check for LPG leaks.
Procedure
- Close the manual shut-off valve (MSV) on the LPG fuel tank.
- Start and run the vehicle until the engine stalls.
- Turn the ignition switch to OFF.
- Disconnect the negative battery cable.
Tools required
- Liquid or electronic leak detector Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- System operates at pressure up to 21.5 bar (312 psi)
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.