General Motors 8.1 — Fuel Pump Replacement
Repair & overhaul
For the General Motors 8.1, from the General Motors service manual.
Applies to: General Motors 8.1L engine
Before you start
- Replace the fuel pump with the identical part number.
Procedure
- Disconnect the negative battery cable.
- Relieve the fuel system pressure; refer to Fuel Pressure Relief Procedure.
- Clean all fuel fitting connections and surrounding areas.
- Disconnect the threaded fittings from the fuel pump.
- Cap the fuel pipes to prevent contamination.
- Disconnect the fuel pump electrical connector.
- Remove the fuel pump.
- Install the fuel pump and reconnect the electrical connector.
- Remove the caps and reconnect the threaded fittings.
- Connect the negative battery cable and inspect for leaks.
Specs & values
- Tighten the fittings to 25 N·m (18 lb ft).
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.