Fuel Pressure Test

Release fuel system pressure. See RELIEVING FUEL PRESSURE . Remove fuel inlet hose banjo bolt. Install fuel pressure adapter and gauge in banjo bolt hole. See Fig 1 .

Fig 1: Testing Fuel System Pressure (Esteem Shown; Others Are Similar)
Courtesy of SUZUKI OF AMERICA CORP.
Verify battery voltage is 11 volts or greater. Turn ignition on to operate fuel pump for 3 seconds. Turn ignition off. Repeat 3-4 times, and check fuel pressure. See FUEL PUMP PERFORMANCE table. Start engine and allow it to reach normal operating temperature. Measure fuel pressure at idle. See REGULATED FUEL PRESSURE table. Turn ignition off.
If pressures are not within specification, check for faulty fuel pump, pressure regulator or restriction in fuel system. See CIRCUIT TEST B-3: FUEL PRESSURE INSPECTION under CIRCUIT TESTS. Repair as necessary. Release fuel pressure and remove fuel pressure gauge. Reinstall fuel inlet hose. Start engine. Ensure no fuel leaks are present.

FUEL PUMP PERFORMANCE

Application

⁽¹⁾ psi (kg/cm² )

Esteem, Grand Vitara & Swift

⁽²⁾ 38.4-44.0 (2.7-3.1)

Vitara

⁽³⁾ 35.6-42.7 (2.5-3.0)

⁽¹⁾	Key on and engine off.

⁽²⁾	Pressure should maintain at least 28.4 psi (2.0 kg/cm² ) for one minute after fuel pump is turned off.

⁽³⁾	Pressure should maintain at least 25.6 psi (1.8 kg/cm² ) for one minute after fuel pump is turned off.

REGULATED FUEL PRESSURE

Application

⁽¹⁾ psi (kg/cm² )

Esteem (1.6L) & Swift

⁽²⁾ 28.4-34.1 (2.0-2.4)

Esteem (1.8L) & Vitara

⁽³⁾ 30.0-37.0 (2.1-2.6)

Grand Vitara

⁽²⁾ 29.8-37.0 (2.2-2.6)

⁽¹⁾	With engine idling.

⁽²⁾	Pressure should maintain at least 28.4 psi (2.0 kg/cm² ) for one minute after fuel pump is turned off.

⁽³⁾	Pressure should maintain at least 25.6 psi (1.8 kg/cm² ) for one minute after fuel pump is turned off.