Remove fuel rail assembly from intake manifold. See appropriate engines article in the ENGINES section. Reconnect fuel lines to fuel rail. Connect a jumper wire between data link connector terminal FP and chassis ground. See Fig 1 .
Turn ignition on and check for fuel leaks from injectors. Fuel leakage should be less than one drop every 2 minutes. If fuel leakage exists, remove injector and check "O" ring and fuel rail for damage. Replace as necessary.

Fig 1: Identifying Data Link Connector Terminals

Courtesy of MAZDA MOTORS CORP.

REGULATED FUEL PRESSURE

Model	@ Idle W/Vacuum psi (kg/cm² )	@ Idle W/O Vacuum psi (kg/cm² )
B2300	35-40 (2.5-2.8)	35-46 (2.5-3.2)

Using mechanics wire, secure each fuel injector to fuel rail. Disconnect fuel injector connectors. Remove fuel rail assembly from intake manifold. See appropriate engines article in the ENGINES section. Reconnect fuel lines to fuel rail. Locate data link connector in left side of engine compartment.
Connect a jumper wire between data link connector terminals F/P and GND. See Figure . Turn ignition on. Tilt injectors about 60 degrees and check injector nozzles for fuel leaks. Fuel leakage should be less than one drop every 2 minutes. If fuel leakage exists, replace injector.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Injector Fuel Leakage