Remove Fuel from burner by removing the sump drain plug with a 5mm Hex key

Turn Airtronic Burner upside down and disconnect primer port tubing at base of fuel pump.

Unscrew both metal fuel line hex‑nut connections with 11mm wrench.

Remove four or six screws (new burner) that hold the fuel sump to the lower fan housing using a ³/₁₆ flat-tip screwdriver

Slowly slide sump horizontally away from the pump to disengage the fuel crossover tube from the sump pump, taking care not to damage overflow safety device.  Remove the fuel sump and crossover tube.  NOTE:  do not damage o-ring connections at both ends of crossover tube.

Re-assembly note:  when re-installing the fuel cross pipe into the pump and the sump, gently work the O-rings into their respective seals until you feel them seat.  

Disconnect fuel solenoid power cable from fuel solenoid coil.

If necessary, detach coil from pump by either removing 13mm nut (new burner) or copper retaining clip (old burner) with pliers.

With 4mm hex key, loosen three pump retaining screws

Lift out pump assembly