General Motors — Draining Oil Build-Up in the Low Pressure Regulator (LPR)

Maintenance

From a General Motors service manual — check it applies to your exact model before use.

Applies to: General Motors 1.6L engine

Procedure

1. Move the equipment to a well ventilated area and ensure no external ignition sources are present.
2. Start the engine; with it running close the manual valve; when the engine runs out of fuel turn OFF the key and disconnect the battery negative cable.
3. Slowly loosen the inlet fitting and disconnect.
4. Loosen the hose clamp at the outlet hose fitting and remove the hose.
5. Remove and retain the locking pin and remove the outlet fitting from the LPR.
6. Disconnect the PTV connection and disconnect the vacuum hose.
7. Remove the two LPR mounting bolts and retain.
8. Place a small receptacle in the engine compartment.
9. Rotate the LPR 90 degrees so the outlet fitting points down into the receptacle and drain the LPR.
10. Inspect the secondary chamber for any large dried particles and remove.
11. Remove the receptacle and reinstall the LPR with the two retaining bolts and tighten to specifications.
12. Reinstall the outlet fitting and secure with the previously removed locking pin.
13. Reconnect the PTV electrical connection until it locks with a click, pull to ensure it is locked, and connect the vacuum line.
14. Reconnect the outlet hose and secure the hose clamp; reinstall the fuel inlet line and tighten connection to specification.
15. Slowly open the manual service valve; check for leaks, start the engine and recheck for leaks at the regulator, and dispose of drained material properly.

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.

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