How do I test a fuel pressure regulator?

(1) Connect the oil pressure gauge to the fuel pipeline; 2) Short the two detection jacks of the electric gasoline pump with a short wire;

3) Turn on the ignition switch (screw to the ON position) and keep LOS to let the electric gasoline pump run; (4) Turn off the ignition switch and unplug the short-circuit wire on the detection jack;

5) Use pliers wrapped in a soft cloth.

Clamp the return pipe of the oil pressure regulator;

6) Observe the fuel pressure after 5 minutes, this pressure is called the oil pressure regulator holding pressure.

Key Benefits: This method of fuel conditioning is equipped with a high-pressure oil line that continuously regulates the fuel pressure so that the fuel pressure is higher than a fixed pressure generated by the manifold pressure.

The basic principle of operation is the same as that of the first fuel regulation method, but because the manifold vacuum is applied to the upper cavity of the diaphragm, the fuel pressure is controlled by changing the fuel pressure according to the manifold pressure when the valve is opened, and the fuel flows back to the fuel tank through the return pipe.

The method of checking the working status of the fuel pressure regulator is as follows:

1. Measure the fuel pressure when the engine is running. The idle fuel pressure should be around 250kpa.

2. Unplug the vacuum tube of the oil pressure regulator and check the fuel pressure. The fuel pressure at this point should be about 50kPa higher than the fuel pressure at idle. If the pressure change does not meet the requirements, it means that the oil pressure regulator is not working well and should be replaced.

1. Inspection of the working condition of the fuel pressure regulator:

The method of inspection is to measure the gasoline pressure when the engine is idling with an oil pressure gauge, then remove the vacuum hose on the gasoline pressure regulator and check the gasoline pressure. At this time, the gasoline pressure should be increased by about 50kpa.

2、.Fuel Pressure Regulator Holding Pressure Check: This check should be done when the fuel system holding pressure does not meet the standard value (less than 147kPa).

The inspection method is to connect the oil pressure gauge to the human fuel line, and use a wire to short the two detection jacks of the electric fuel pump.

Use an oil pressure gauge to measure the gasoline pressure when the engine is idling, then unplug the vacuum hose on the gasoline pressure regulator, and check the gasoline pressure, I hope it will help you.

Generally, we use a fuel pressure gauge to detect the oil pressure value of the system, and at present, we basically use the design without oil return pipe. The oil pressure of the system is kept at 400kpa, and the oil pressure of the accelerator system should be kept unchanged, if the oil pressure is unstable when accelerating, please check the oil pressure regulator.

A term used in the automotive industry. It is one of the common components of the fuel injection system of EFI vehicles. What it does:

Parts that ensure the normal fuel pressure in the oil circuit of the automobile; Working principle: the oil pressure is coordinated by the spring and the vacuum degree of the air chamber, when the oil pressure is higher than the standard value, the high-pressure fuel will move up the diaphragm, the ball valve will be opened, and the excess fuel will be reversed through the return pipe to the oil tank.

Fuel System Pressure Detection Test Method 1 Pressure relief: Unplug the fuel pump fuse first.

Relay or oil pump plug, start the engine again until the engine turns off by itself, start the head motor again 2 3 times, and then remove the negative pole of the battery. 2 Install the fuel pressure gauge.

Connect the fuel pressure gauge in series in the oil inlet pipe, and the vehicle with the pressure gauge connects the fuel pressure gauge to the pressure gauge, and when disassembling the oil pipe, use a towel or cotton cloth to pad it under the oil pipe interface to prevent fuel leakage on the ground. 3 Detection oil pressure: static oil pressure, idle oil pressure, maximum oil pressure, residual oil pressure Static tomato oil pressure:

Without starting the engine, connect the two terminals on the diagnostic connector of the oil pump with jumper wires.

Toyota's "+B" and "FB" terminals) and turn the ignition switch to the "Zhaocha On" position to make the oil pump work, and the static oil pressure is generally around 300 kPa.

1. Pressure relief: first unplug the fuel pump fuse, relay or oil pump plug, and then start the engine until the engine turns off by itself, start the engine again 2 3 times, and then remove the negative pole of the battery.

2. Install the fuel pressure gauge: connect the fuel pressure gauge in series in the oil inlet pipe, connect the fuel pressure gauge to the pressure gauge on the pressure gauge for the vehicle with the pressure gauge, and use a towel or cotton cloth to pad the oil pipe interface when disassembling the oil pipe to prevent fuel leakage on the ground.

3. Detect oil pressure: static oil pressure, idle oil pressure, maximum oil pressure, residual oil pressure.

Failure of the air intake system.

The air intake system is composed of air filter, air intake branch, sensor, idle device, boost control, etc., and its sensors include: air flow sensor, air pressure sensor, throttle position sensor, intake air temperature sensor, cooling temperature sensor, etc., the failure of these related components will affect the normal operation of the engine.

Leakage in the intake system or clogged exhaust.

If the air intake system leaks, the mixture will be too thin, because the leaked air enters the intake pipe without the air flow sensor, causing the engine to idle unsteadily and accelerate poorly; If the EGR solenoid valve is blocked or damaged, causing the exhaust gas to enter the inlet pipe under idle condition, it will also cause the mixture to be too thin; Similarly, when the PCV valve fails, the residual exhaust gas in the crankcase enters the intake pipe at idle, causing the mixture to be too thin.

The blockage of the exhaust system is generally caused by the carbon deposition in the three-way catalytic converter and the muffler or the crushing in the three-way catalytic converter, because the exhaust system is faulty, it will be blocked from time to time, so the backpressure is larger when the exhaust is exhausted, so that the sum of the negative pressure formed by the intake pipe when the engine cylinders are alternately intake decreases, resulting in incomplete exhaust, and the air-fuel ratio is abnormal and the ignition adjustment is out of control, the air intake is not sufficient, and the power is obviously insufficient.

The function of EFI idle control for throttle failure is to realize the rapid warm-up process after the engine starts; The second is to automatically maintain the engine idle speed in various target speeds under the stable operation of the teasing, the idle beam is basically to control the opening of the rubber cavity valve, if the throttle valve carbon deposit is too much, so that the idle control valve in the same opening, the air intake is relatively reduced, resulting in unstable idling.

Fuel system failure.

The fuel system is one of the most important systems of the electronic control system, the main role is to provide sufficient fuel to the engine, the fuel from the fuel tank through the oil pump pressurized, filtered through the fuel filter, supplied to the injector, EUC according to the input signal of the system sensor control injector open, the fuel is injected into the cylinder with a certain amount and pressure for combustion, if the injector is faulty, the fuel pressure is too low or too high will affect the entire electronic control system, which will lead to poor acceleration and unstable idling.

Function: Components that ensure the normal fuel pressure in the oil circuit of the automobile;

Working principle: The fuel is pressurized by the oil pump to form a certain required pressure in the oil circuit (for example, the pressurized fuel is supplied to the injector, and the injector solenoid valve is opened, and the high-pressure fuel can be injected into the intake manifold to form a mist oil bundle, so that the fuel and air are mixed?).

The function of the pressure regulator is to keep the pressure in the oil circuit constant, if the oil pressure is too low, the injector injection is too weak or not injected, and if the oil pressure is too high, the oil circuit will be damaged or the injector will be damaged.

There is a diaphragm inside the pressure regulator, which plays the role of controlling the opening and closing of the pressure valve, when the oil pressure is lower than a certain value, the pressure valve is closed, and the pressure in the oil circuit is increased by the oil pump, when it is increased to exceed the specified pressure, the diaphragm is opened, and the overpressure fuel flows back to the oil tank through the oil return pipeline to play the role of decompression;

In an electronically controlled fuel injection system, the function of the fuel pressure regulator is to maintain the difference between the system oil pressure and the constant pressure of the intake pipe, usually the injection volume of the 250 kp injector is mainly determined by the opening time of the injector, because the amount of fuel injected by the engine is determined by the timely power of the injector controlled by the ECU. If the fuel pressure is not controlled, the oil pressure is determined by the vacuum of the spring and the air chamber, even if the power of the injector is the same.

Harmonize. When the oil pressure is higher than the standard value, the high-pressure fuel pushes the diaphragm, the ball valve opens, and the excess fuel flows into the fuel tank through the return pipe;

<> when the pressure falls below the standard value, the spring will press down on the diaphragm, close the ball valve and stop the oil return. Fuel pressure regulators are usually installed on the main supply line. The oil pressure regulator is a metal casing.

The inner cavity of the shell is divided into two chambers by a diaphragm encrypted in the center. The spring chamber is mounted with a coil spring, the preload of which acts on the diaphragm. The spring chamber passes through an empty tube.

Connect with the collector; The other room is the fuel chamber, which is connected directly to the main oil supply line. When the fuel pressure entering the supply chamber of the main fuel line exceeds a predetermined value, the fuel pressure will push the diaphragm over the spring pressure to open the valve controlled by the diaphragm, and the excess fuel in the fuel chamber flows back to the fuel tank through the return line.

How the fuel pressure regulator works: The oil pressure is coordinated by the vacuum level of the spring and the air chamber. When the oil pressure is higher than the standard value, the high-pressure fuel pushes the diaphragm up, the ball valve opens, and the excess fuel returns to the fuel tank through the return pipe; When the pressure falls below the standard value, the spring will depress the diaphragm, close the ball valve and stop the oil return.

The function of the pressure regulator is to keep the pressure in the oil circuit constant. If the oil pressure is too low, it means that the injector injection is too weak, if the oil pressure is too high, the oil circuit is damaged or the injector is damaged. A fuel pressure regulator is a component that ensures proper fuel pressure in a vehicle's oil circuit.

There is a diaphragm inside the pressure regulator that controls the pressure valve.

on and off. When the oil pressure falls below a certain value, the pressure valve closes and the oil pump pressurizes to increase the pressure in the oil circuit. When the pressure exceeds the specified pressure, the diaphragm opens and the overformed fuel is returned to the tank through the return pipe, illustrating the role of decompression.

When the oil pressure is higher than the standard value, the high-pressure fuel will move up the diaphragm, the ball valve will be opened, and the excess fuel will be regurgitated through the return pipe. When the pressure is lower than the standard value, the spring will press down on the diaphragm to close the ball valve and stop the oil return.

Fuel pressure regulators are generally installed on the tubing from the oil line. It consists of a metal casing with an internal diaphragm that separates the inner chamber of the casing into two chambers. One is that the spring chamber is connected by a vacuum hose with an intake branch, which is equipped with a preload spring and acts on the diaphragm.

The other chamber is the fuel chamber, which is connected to the fuel supply manifold.

The fuel pressure regulator is broken. What are the symptoms?

1.When the fuel pressure regulator is broken, the car is not easy to ignite.

When there is a problem with the fuel pressure regulator and the fuel cannot be supplied normally, then it is very likely that when we ignition, the power of the car will not meet the requirements and it will be difficult to start.

2.The fuel pressure regulator was broken and the gasoline was contaminated.

If it is the mixture intake that causes the problem with the fuel pressure regulator, it can cause our gasoline to be contaminated by the mixture, resulting in improper gasoline use.

How to check the fuel pressure regulator.

1.Check the working condition of the fuel pressure regulator:

The inspection method is to measure the gasoline pressure when the engine is idle with an oil pressure gauge, and then unplug the vacuum hose on the gasoline pressure regulator to check the gasoline pressure. At this time, the gasoline pressure should be increased by about 50kPa. If the pressure change does not meet the requirements, it means that the gasoline pressure regulator is not working properly and should be replaced.

2.Check the pressure of the fuel pressure regulator:

This check should be performed when the fuel system pressure does not meet the standard value (less than 147kPa). The inspection method is to connect the oil pressure gauge to the fuel line, and use the wire to short the two detection jacks of the electric fuel pump.

Turn on the ignition and let the electric fuel pump run for 10 seconds, then turn off the ignition and remove the wires. Then clamp the return pipe of the gasoline pressure regulator, and observe the gasoline pressure after 5 seconds, which is the holding pressure of the gasoline pressure regulator. If the pressure is lower than the fuel system holding pressure.

What to do if the fuel pressure regulator fails?

1.Clean the injectors, throttle body, and idle motor.

If the fuel pressure regulator fails during driving, we need to check whether it is caused by the injector, throttle body, and idle motor are not clean, and then check and clean.

2.Check the vacuum diaphragm.

Inside the fuel pressure regulator, there is a vacuum diaphragm, which is designed to better ensure the normal use of our regulator and prevent gasoline from leaking. If we find that the fuel pressure regulator is faulty, we can check if the vacuum diaphragm is broken.

3.Discharge of mixed air.

Problems with our fuel pressure regulators are often caused by contamination caused by mixed air entering the interior. In this case, we only need to exhaust the mixture air and check the tightness of the regulator.

Preparation steps before inspection: Pressure release of fuel system Ways to release pressure on fuel system:1

Start the engine and maintain idling. 2.Disconnect the power wiring of the oil pump relay or the oil pump, start the engine, and make the engine stop by itself.

3.Starting the engine 2-3 times more will completely relieve the pressure on the fuel system. 4.

Turn off the ignition switch and install the power wiring of the oil pump relay or electric fuel pump. Detection of fuel pressure regulator: 1

Fuel system pressure check: When checking the fuel system pressure, first install the fuel pressure gauge (referred to as the oil pressure gauge) as required; The oil pressure gauge can be mounted on the oil filter pipe fitting, fuel distribution pipe inlet fitting, or anywhere the fuel line is easily installed and viewed by a tee fitting. Test Items:

2.The oil supply pressure refers to the actual working hydraulic pressure of the fuel system during the engine idle process, and the normal hydraulic value is. Violent shaking of the needle may cause the hydraulic pressure to be abnormal.

3.Adjust the pressure During the engine idling process, after removing the valve of the hydraulic regulator, the value of the difference between the hydraulic pressure minus the oil supply pressure after the fuel system rises should be 28 The maximum hydraulic pressure during the engine idle process, the oil pressure of the fuel system when clamping the return pipe should be 2 3 times the oil supply pressure. 5.

The method of judging the amount of oil supplied is as follows: in the process of engine idling, read the fuel supply pressure of the fuel system, and then suddenly accelerate to more than 3000r min, and immediately read the hydraulic value at this time, and the oil supply pressure is more than 21kpa. Below this value, it indicates that the oil supply is insufficient.

6.System residual engine idling during the reading of the hydraulic pressure of the fuel system. Then, turn off the engine and wait for 5min to keep the system oil pressure above 250kpa.

When the residual pressure cannot be maintained, start the engine, establish the hydraulic pressure and then turn off the balance. At this time, if the normal residual pressure can be maintained after clamping the oil return pipe, it means that the hydraulic regulator is leaking; When the normal residual pressure is maintained after being caught in the oil line, it indicates that the fuel pump (check valve) is leaking. If the residual pressure cannot be maintained by clamping the oil line and the return pipe at the same time, it means that the injector organic oil is leaking.

Example of a fuel pressure regulator: Measurement of the pressure of the fuel ** system of the Volkswagen Santana 2000 car AJR engine1As shown in the figure below, install the pressure gauge on the fuel supply pipe of the gasoline distribution pipe, turn on the gasoline pressure gauge switch, and make the engine idle running.

The system pressure standard is: (30020) kPa when the vacuum tube is pulled out at idle; The vacuum tube is (25020) connected to the vacuum tube, blow the throttle slowly, and the pointer of the gasoline pressure gauge must beat between 280 and 300kpa. 3.

Turn off the ignition switch, and after 10 minutes, when the gasoline holding pressure is not lower than the gasoline holding pressure is lower than 150kpa, start the engine and idle the operation. After establishing the gasoline pressure, turn off the ignition switch, and at the same time turn off the gasoline pressure gauge switch, and continue to observe whether the pressure gauge pointer drops. 5.

Causes of insufficient hydraulic pressure in the system: leakage of pipe joints or pipes; The gasoline filter is too dirty, the gasoline pump is faulty, or the battery voltage is insufficient; Gasoline pressure regulator is damaged. 6.

Cause of high hydraulic pressure of the system: Gasoline pressure regulator is damaged.