Fuel Pressure Test
- Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE
under FUEL SYSTEMS in this article. Verify battery voltage is at least 11 volts.
- On DOHC models, remove ISC solenoid valve and EGR modulator bracket (if equipped). See Figure
- Separate fuel feed hose from fuel delivery pipe near fuel rail. Install fuel pressure gauge and 3-way connector between fuel feed hose and fuel return hose. See Fig 1
and Fig 2
.
- On SOHC models, remove air cleaner. Disconnect fuel feed hose from throttle body. Install fuel pressure gauge and 3-way connector between fuel feed hose and throttle body. Install air cleaner.
- To jumper fuel pump relay on all models, remove fuel pump relay from fuse/relay box with harness connector installed. Fuse relay box is located in engine compartment, behind battery. Using jumper wire, connect Pink wire terminal to White/Blue wire terminal.
- Turn ignition on. Fuel pressure should be within specification. See the FUEL PUMP PERFORMANCE
table. Turn ignition off and recheck pressure after one minute. Fuel pressure should be within specification.
- Remove jumper wire. Install ISC solenoid valve on DOHC models. On all models, start engine and warm to normal operating temperature. Note fuel pressure with engine idling. Fuel pressure should be within specification.
- If pressure is not within specification, check for defective fuel pump, pressure regulator or restriction in fuel system. Repair as required. Release fuel pressure and remove fuel pressure gauge. Reconnect fuel hoses and check for leaks.
Courtesy of SUZUKI OF AMERICA CORP.
Courtesy of SUZUKI OF AMERICA CORP.