1991 Suzuki Swift GTFACTORY OEM SERVICE PROCEDURE

Fuel Pump Circuit

Turn ignition on; leave engine off. Fuel pump should operate for 2 seconds. If fuel pump does not operate, check fuses, fuel pump control relay, fuel pump, all electrical connections and ECM. See I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section.

NOTE: Fuel pump performance is a measurement of fuel pressure availability, not regulated pressure.
FUEL PUMP PERFORMANCE

Application (1) psi (kg/cm2 )
DOHC (2) 35.5-38.4 (2.5-2.7)
SOHC (3) 22.7-29.9 (1.6-2.1)
(1) Specification listed is with ignition on and engine off.
(2) Pressure should remain at 25.6 psi (1.8 kg/cm2 ) for one minute after fuel pump is turned off.
(3) Pressure should remain at 12.8 psi (.9 kg/cm2 ) for one minute after fuel pump is turned off.
REGULATED FUEL PRESSURE

Application (1) psi (kg/cm2 )
DOHC (2) 25.6-29.9 (1.8-2.1)
SOHC (3) 12.8-20.0 (.9-1.4)
(1) Specification is listed with engine idling.
(2) Pressure should remain at 25.6 psi (1.8 kg/cm2 ) for one minute after fuel pump is turned off.
(3) Pressure should remain at 12.8 psi (.9 kg/cm2 ) for one minute after fuel pump is turned off.
Factory Service Tools

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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.