Fuel Pressure Test
- Relieve fuel system pressure and verify battery voltage is at least 11 volts. Remove ISC solenoid valve and EGR modulator bracket (if equipped). See Figure
.
- Separate fuel hose from fuel pipe near fuel rail and attach fuel pressure tester. Remove fuel pump relay from main fuse box leaving wire harness connector attached. Using jumper wire, connect Pink terminal to White/Blue terminal. See Fig 1
.
- Turn ignition on. With fuel pump operating and engine off, fuel pressure should be 35.5-38.4 psi (2.5-2.7 kg/cm2
). Turn ignition off and allow one minute for pressure to reduce. Minimum fuel pressure should be 25.6 psi (1.8 kg/cm2
).
- Install ISC solenoid valve and start engine to ensure that there is no leakage at pressure gauge connection. Measure and record fuel pressure with engine idling. Fuel pressure should be 25.6-29.9 psi (1.8-2.1 kg/cm2
).
- If pressure is not within specification, check for defective fuel pump, pressure regulator or restriction in fuel system. Repair as necessary. Remove pressure gauge and start engine to ensure that no fuel leakage exists.
REGULATED FUEL PRESSURE
| Application |
Engine Off psi (kg/cm2
) |
psi (kg/cm2
) At Idle |
| Swift |
25.6 (1.8) |
25.6-29.9 (1.8-2.1) |
Courtesy of SUZUKI OF AMERICA CORP.