1990 Suzuki Swift GLXFACTORY OEM SERVICE PROCEDURE

Fuel Pressure Test

  1. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE  under FUEL SYSTEMS in this article. Verify battery voltage is at least 11 volts.
  2. On DOHC models, remove ISC solenoid valve and EGR modulator bracket (if equipped). See Figure
  3. 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 .
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. 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.
Fig 1: Testing Fuel Pressure (Swift DOHC)
G90J20791Courtesy of SUZUKI OF AMERICA CORP.
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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.

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