Fuel Pressure Check

IG KEY "OFF".
Disconnect a fuel pump relay.
Engine start and wait until engine stop. and then key "OFF".
Install fuel pump relay.
Connect fuel pressure gauge using the correct adaptor.
Start the engine, and record fuel pressure.
Specification: Approx. 3.5kg/cm²

Fig 1: Checking Fuel Pressure Using Fuel Pressure Gauge
Courtesy of KIA MOTORS AMERICA, INC.
Is the fuel pressure normal?
YES
- Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage. Check for poor connections, and check the related circuit between ECM and component thoroughly. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Check for clogging of the fuel filter.
- Check the fuel supply and return line.
- Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.