Start engine and warm to normal operating temperature. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE under FUEL SYSTEM in this article. Attach Pressure Gauge Set (09912-58412) at fuel filter inlet union. See Fig 1 . Start engine and ensure there is no leakage at pressure gauge connection, turn engine off.
To operate fuel pump with engine off, jumper wire Pink/Black and Black/White fuel pump relay wires. See the FUEL PUMP RELAY LOCATION table. Turn ignition on. Measure and record fuel pressure with pump operating and engine off. Turn ignition off, and allow one minute for fuel pressure to reduce. Measure and record minimum (rest) fuel pressure. See FUEL PUMP PERFORMANCE table.
Remove jumper wire from fuel pump relay and start engine. Measure and record fuel pressure with pump operating and engine running at idle. Turn ignition off, and allow one minute for fuel pressure to reduce. Measure and record minimum (rest) fuel pressure. See REGULATED FUEL PRESSURE table.
If pressures are not within specification, check for defective fuel pump, pressure regulator or restriction in fuel system. Repair as required. Remove fuel pressure gauge and start engine to ensure that no fuel leakage exists.

Fig 1: Testing Fuel System Pressure

Courtesy of SUZUKI OF AMERICA CORP.

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

Fuel Pressure Test