Questionwhere is the fuel line pressure valve located so i can check to see if i have fuel pressure?
thanks Tanya
Answer
this is the basic way being i dont know what car you have but this works on all models
SERVICE MANUAL
Fuel System Fuel Delivery System
FUEL PRESSURE TEST
Reduce the internal pressure of the fuel pipes and hoses by the following procedures:
Disconnect the fuel pump harness connector after removing the rear seat cushion.
Start the engine and, after it stops by itself, turn the ignition switch to the OFF position.
Disconnect the battery negative (-) terminal.
Connect the fuel pump harness connector.
Remove the upper eye bolt while holding the fuel filter nut securely.
CAUTION
Cover the hose connection with a shop towel to prevent splashing of fuel caused by residual fuel pressure in the fuel line.
Using the fuel pressure gauge connector (09353-24000), install the fuel pressure gauge (09353-24100) to the fuel filter. Tighten the bolt to the specified torque.
TORQUE SPECIFICATION
Fuel pressure gauge to fuel filter 25-35 Nm250-350 kg·cm18-26 lb·ft
Connect the battery's negative (-) terminal.
Apply battery voltage to the terminal for the pump drive and activate the fuel pump. Then, with fuel pressure applied, check that there is no fuel leakage from the pressure gauge or connection part.
Start the engine and let it idle.
Disconnect the vacuum hose from the pressure regulator and plug the hose end. Measure the fuel pressure at idle.
PRESSURE SPECIFICATION
Standard value 3.06 kg·cm300 kPa43.5 psi
Measure the fuel pressure when the vacuum hose is connected to the pressure regulator.
PRESSURE SPECIFICATION
Standard value 2.55 kg·cm250 kPa 36.2 psi
If the results of the measurements made in steps (7) and (8) are not within the standard value, use the table below to determine the probable causes, and make the necessary repairs.
Condition Probable cause Remedy
Fuel pressure too low
Clogged fuel filter.
Fuel leakage to the return side, caused by poor seating of the fuel-pressure regulator.
Low discharge pressure of the fuel pump.
Replace fuel filter.
Replace fuel pressure regulator.
Check the in-tank fuel hose for leakage or replace the fuel pump.
Fuel pressure too high
Sticking fuel-pressure regulator.
Clogged or bent fuel return hose or pipe.
Replace fuel pressure regulator
Repair or replace hose or pipe.
There is no difference in fuel pressure when the vacuum hose is connected and when it is not.
Clogging, or damaged vacuum hose of the nipple.
Sticking or poor seating of the fuel-pressure regulator.
Repair or replace the vacuum hose or the nipple.
Repair or replace hose or pipe.
Stop the engine and check for a change in the fuel pressure gauge reading, which should hold for approximately 5 minutes. If the gauge indication drops, observe the drop rate.
Determine the causes according to the following table.
Condition Probable cause Remedy
Fuel pressure drops slowly after engine is stopped
Injector leakage
Replace injector
Fuel pressure drops immediately after engine is stopped
The check valve within the fuel pump is open
Replace fuel pump
Reduce the fuel pressure in the fuel line.
Disconnect the hoses and the gauge.
CAUTION
Cover on the hose connection with a shop towel to prevent splashing of fuel caused by fuel residual pressure in the fuel line.
Replace the O-ring of the end of the hose.
Connect the fuel hose to the delivery pipe and tighten with the specified torque.
Check for fuel leakage.
