Fuel Pressure Check: Troubleshooting

NOTE: Before using the following flow chart, check that battery voltage is higher than 11 V. If it is lower, fuel pressure becomes lower than specification even if fuel pump and line are in good condition.

TROUBLESHOOTING CHART

Step	Action	YES	NO
1	Was "Fuel Pump and Its Circuit Check" performed?	Go to Step 2.	Go to FUEL PUMP AND ITS CIRCUIT CHECK .
2	Fuel pressure check 1 Check fuel pressure. See FUEL PRESSURE BASIC CHECK Is check result satisfactory?	Go to Step 3.	Go to Step 6.
3	Fuel pressure check 2 Start engine and warm up to normal operating temperature. Keep engine speed at 4, 000 RPM. Does fuel pressure show about same value as Step 2?	Go to Step 4.	Go to Step 6.
4	Fuel line check 1 Check fuel pipe, fuel hose and joint for fuel leakage. Are they in good condition?	Go to Step 5.	Repair or replace defective part.
5	Fuel line check 2 Check fuel pipe, fuel hose and joint for damage or deformation. Are they in good condition?	Fuel system is in good condition.	Repair or replace defective part.
6	Was fuel pressure higher than specification in Step 2?	Go to Step 7.	Go to Step 8.
7	Fuel line check 3 Check fuel pipe, fuel hose and joint for damage or deformation. Are they in good condition?	Fuel pressure regulator is in faulty condition.	Repair or replace defective part.
8	Fuel line check 4 Check fuel pipe, fuel hose and joint for damage or deformation. Are they in good condition?	Clogged fuel filter, faulty fuel pump, faulty fuel pressure regulator or fuel leakage from hose connection in fuel tank.	Repair or replace defective part.