Component Inspection

■ Fuel Filler Cap Inspection 

1. Check fuel filler cap for being tightly installed, has o-ring seal installed and is in good condition.
2. Verify cap releases pressure/vacuum at specified values

   Specification:  Approx. 2 psi pressure and approximately 1.5 inches of mercury vacuum.

   Fig 1: Locating Gasket

   Courtesy of HYUNDAI MOTOR AMERICA
3. Are cap, o-ring and release pressures okay?

   YES 

   • Thoroughly check fuel filler pipe for cracks, damage and o-ring seat for deformation and replace as necessary. Go to next step below.

   NO 

   • Replace fuel filler cap and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

■ Fuel Tank Pressure Sensor Inspection 

1. IG "ON" & Engine "OFF".
2. Disconnect hose connecting FTPS to the Fuel Tank.
3. Using a vacuum pump, apply vacuum to the hose connecting to FTPS.
4. Measure FTPS output voltage between signal terminal of the FTPS harness connector and chassis ground.

   Specification: Voltage increases proportionally with decreasing pressure. 

   Pressure (kPa)	Out Voltage (V)
   -6.67	0.5
   0	2.5
   6.67	4.5

5. Is voltage within the specification?

   YES 

   • Check for poor connection between PCM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
   • Check for cracks or damage in hose connecting canister and fuel pump. Repair or replace as necessary.

   NO 

   • Check for open or short in FTPS harness. Repair as necessary. If OK, test with a new FTPS and check for proper operation. If problem is corrected, replace FTPS and go to "VERIFICATION OF VEHICLE REPAIR " procedure.