Toyotafuelpressuretestadapter

5.      Fuel pressure that drops-off during acceleration, during cruise, or during hard cornering may cause a lean condition. A lean condition can cause a loss of power, surging, or misfire. You can diagnose a lean condition with scan tool. If an extremely lean condition occurs, the oxygen sensors will stop toggling. The oxygen sensor output voltages will drop to less than 500 mV. Also, the fuel injector width will increase.

15.  A lean condition may result from fuel pressure that is less than 333 kPa (48 psi). A lean condition may cause a DTC P0131 or a DTC P0171 to set. Driveability conditions that are associated with lean conditions can include hard starting when the engine is cold, hesitation, poor driveability, lack of power, surging, and misfiring.

Fuelpressure Tester

8.      When the engine is at idle, the manifold pressure is low, indicating a high vacuum. This low pressure is applied to the fuel pressure regulator diaphragm. The low pressure will offset the pressure that is being applied to the fuel pressure regulator diaphragm by the spring inside the fuel pressure regulator. When this occurs, the result is lower fuel pressure. The fuel pressure at idle will vary slightly during barometric pressure changes, but the fuel pressure at idle should always be less than the fuel pressure noted in Step 2, with the Engine OFF.

Important: Ensure that the fuel system is not operating in the Fuel Cut-Off Mode. This can cause false indications from the scan tool.

Important:: The fuel pump will run for approximately 2 seconds. Cycle the ignition as necessary in order to achieve the highest possible fuel level. Note this pressure.

How to checkfuelpressure without gauge

When the ignition switch is turned ON, the Powertrain Control Module (PCM) will turn ON the in-tank fuel pump. The in-tank fuel pump will remain ON as long as the engine is cranking or running and the PCM is receiving reference pulses. If there are no reference pulses, the PCM will turn the in-tank fuel pump OFF 2 seconds after the ignition switch is turned ON, or 2 seconds after the engine stops running. The in-tank fuel pump is an electric pump within an integral reservoir. The in-tank fuel pump supplies fuel through the fuel feed pipe, and in-line fuel filter to the Fuel Rail Assembly. The fuel pump is designed to provide fuel at a pressure that is above the pressure needed by the fuel injectors. A fuel pressure regulator, attached to the Fuel Rail, keeps the fuel available to the fuel injectors at a regulated pressure. Unused fuel is returned to the fuel tank by a separate fuel return pipe. The fuel pressure gauge J 34730-1A and fuel pipe shut off adapters J 37287 are used for fuel system diagnosis.

12.  A rich condition may result from the fuel pressure being above 376 kPa (55 psi). A rich condition may cause a DTC P0132 or a DTC P0172 to set. Driveability conditions associated with rich conditions can include hard starting followed by black smoke, and a strong sulfur smell in the exhaust.

22.  Check the spark plug that is associated with a particular fuel injector for fouling or for saturation in order to determine if that particular fuel injector is leaking.

HyundaifuelPressuretestAdapter

Important:: The fuel pump will run for approximately 2 seconds. Cycle the ignition as necessary in order to achieve the highest possible fuel level

16.  Restricting the fuel return pipe with the fuel pipe shut-off adapter causes the fuel pressure to rise above the regulated fuel pressure. Use a scan tool in order to pressurize the system. The fuel pressure should rise to more than 376 kPa (55 psi) when the valve on the fuel pipe shut-off adapter that is connected to the fuel return pipe becomes partially closed.

Caution: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete.

FuelpressureTestKit

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13.  This test determines if the high fuel pressure is due to a restricted fuel return pipe, or if the high fuel pressure is due to a faulty fuel pressure regulator.

FuelPressure Regulator

Fuelpressuretestport

Caution: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete.

Testingfuelpump with battery

What is the fuel pressure of a L67 engine. GM service manual indicates 45-55 PSI at the rail test point. I have run as high as 62PSI, but the average on modified engines with the stock injectors is 58PSI. Should you run these pressures? It is up to you and your tuning ability, and what PCM programming you have. What works 100% for one person, does not work 100% for another person. Its an average of information, and what the engine is happy with.

Notice: Do not allow the fuel pressure to exceed 450 kPa (65 psi). Fuel pressure in excess of 450 kPa (65 psi) may damage the Fuel Pressure Regulator.

Important:: The fuel pump will run for approximately 2 seconds. Cycle the ignition as necessary in order to achieve the highest possible fuel level

Notice: Do not allow the fuel pressure to exceed 450 kPa (65 psi). Fuel pressure in excess of 450 kPa (65 psi) may damage the Fuel Pressure Regulator.

Important: You must remove the fuel sender assembly in order to inspect the fuel pump strainer and the fuel pump flex pipe. Refer to Fuel Sender Assembly Replacement

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Notice: Do not allow the fuel pressure to exceed 450 kPa (65 psi). Fuel pressure in excess of 450 kPa (65 psi) may damage the Fuel Pressure Regulator.