Fuel System Inspection

1. Disconnect the fuel feed tube from the high-pressure fuel pump.
   CAUTION: There may be some residual pressure even after performing "Release Residual Pressure in Fuel Line" procedure. Therefore, cover the hose connection with a shop towel to prevent residual fuel from spilling out before disconnecting any fuel line.
2. Install the fuel pressure gauge and measure the fuel pressure in between the fuel feed line and the high-pressure fuel pump (refer to figure below).

Courtesy of KIA MOTORS AMERICA, INC.

1. Start the engine and measure the fuel pressure at idle.

   Specification:  Fuel Pressure - 330 to 370 kPa (3.37 - 3.77 kgf/cm² /47.9 - 53.7 psi)

   CAUTION: If the fuel pressure differs from the standard value, repair or replace the related parts (refer to the table below).

   Fuel Pressure	Cause	Related Parts
   Too Low	Fuel Filter Clogged	Fuel Filter
   	Fuel Leakage	Fuel Pressure Regulator
   Too High	Fuel Pressure Regulator Stuck	Fuel Pressure Regulator

2. Stop the engine, and measure the difference in fuel pressure drop in the fuel pressure gauge.

   Standard Value:  The gauge reading should hold for about 5 minutes after the engine stops

   CAUTION: If the gauge reading is not held, repair or replace the related parts (refer to table below).

   Fuel Pressure (After Engine Stops)	Cause	Related Parts
   Fuel Pressure Drops Slowly	Fuel Injectors Leaking	Injectors
   Fuel Pressure Drops Immediate	Fuel Pump Check Valve Stuck Open	Fuel Pump

Good 

• Go to "WIRING INSPECTION " procedure.

No Good 

• Repair as necessary and Go to "VERIFICATION OF REPAIR " procedure.