Fuel System Inspection

Check the fuel for excessive water, alcohol, or other contaminants. Replace contaminated fuel as necessary.
Disconnect the vacuum hose from the fuel pressure regulator and inspect the hose for the presence of fuel. If any fuel is present in the vacuum hose, replace the fuel pressure regulator. Go to next step.
Install a fuel pressure gauge.
Start engine and let it idle. With the vacuum hose from the fuel pressure regulator disconnected, inspect fuel pressure.
1. Specification: 320~350 kPa (3.2~3.5 kg/cm² , 46~51 psi)
Is fuel pressure within the specification?
YES
1. Go to "FUEL INJECTOR INSPECTION " procedure as below.
NO
1. Repair as necessary refer to inspection note as below and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
CAUTION:
1. Check if fuel line pressure decreases when accelerating quickly.
  1. If it does, check fuel pump maximum pressure. If pressure is OK, check fuel line and filter for clogging.
  2. If fuel pressure is lower than specification : Check for fuel line pressure while pinching fuel return hose.
  1. If pressure quickly increases, check pressure regulator.
  2. If pressure gradually increases, check for clogging between fuel pump and pressure regulator. If hose is not clogged, check fuel pump maximum pressure.
  3. If fuel pressure is higher than specification: Is fuel line clogged?
  1. If it is not, replace pressure regulator.
  2. If it is, replace it.