General Motors — Draining the FCC Bowl
Maintenance · Fuel Control Cell (FCC)
From a General Motors owner's manual covering: 5.0L MPI, 5.0L MPI CES, 5.7L MPI, 5.7L MPI CES, 6.0L MPI, 6.0L MPI CES, 6.0LHO MPI CES, MP 5.0L, MP 5.7L, MP 6.0L. Check it applies to your exact model before use.
Before you start
- Both fuel and water will drain from the FCC bowl
- Engine OFF; fuel system operates under high pressure
Procedure
- Disconnect two-wire electrical connectors from FCC and Low Pressure Fuel Pump
- Remove the 7/16 inch plug and drain bowl contents into approved container
- Apply gasoline-suitable pipe sealant to the 7/16 inch plug threads
- Tighten the 7/16 inch plug
- Reconnect the two-wire electrical connectors
- Cycle ignition key several times to fill the FCC bowl
- Start engine and inspect for fuel leaks
Source: General Motors owner'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.