The fuel pressure regulator VAZ-2114: symptoms, repair. Fuel system VAZ-2114

All engines with electronic fuel injection system are equipped with devices that support the required pressure of fuel in the fuel line. In the power unit VAZ-2114 this function performs a special controller. The gasoline under pressure is supplied to the injectors in the correct amount depending on the operating mode of the motor.

In this article we will talk about what is a fuel pressure regulator VAZ-2114, how it works and where it is. Also, consider it possible malfunctions and methods of their elimination.

Design Features and principle of operation

Structurally, the fuel pressure regulator VAZ-2114 is a membrane overflow valve, enclosed in a metal housing. It is mounted on a rail, is inserted into one of her nipples through the rubber seal. Another way RDT is connected to the fuel line. To determine the magnitude of the engine load regulator is connected to intake manifold vacuum hose. Thus, the membrane on the one side is fuel flowing under pressure from the fuel pump, and on the other – air pressure and the spring force of the valve.

The fuel pressure Regulator VAZ-2114 has a fairly simple working principle. When you press on the accelerator pedal, the intake manifold creates a pressure that opens the valve, flowing into the ramp more fuel. When closing the throttle the air pressure in the intake pipe is weakened. The valve thus opens in the opposite direction, releasing the gas back in the fuel line.

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Symptoms of RDT

Faulty fuel pressure regulator VAZ-2114 does not bear a critical threat, but his failure violates the stable operation of the engine. Symptoms of a breakdown of RDT can be:

• Hard start the power unit;
• Unstable revolutions of the crankshaft at idle;
• Decrease power characteristics of the motor;
• Loss of dynamics;
• The emergence of “failures” when pressing on the accelerator pedal;
• Increased fuel consumption.

Finding these symptoms of RDT, you should troubleshoot the device and determine the cause of failure.

Possible malfunctions of RDT

Given that the design of the pressure regulator is mechanical, disorders in the work can be quite often. The most common faults of the device include:

• A weakening of the membrane spring;
• Seizure (dragging) of the valve;
• Blockage of the controller;
• The tightness of the joints between the regulator and the housing ramps.

Weakening the springs on the membrane leads to the fact that valve can not cope with the pressure of air coming from the intake manifold. As a result, the pressure and the quantity of fuel reduced.

Jamming the valve leads to an uncontrolled flow of fuel into the manifold and its “waste” in the fuel line. In this case, increasing the consumption of gasoline, and the motor stops normally run from-for shortages of fuel.

Similar symptoms can be observed in case of clogging of the regulator. Dirt and deposits decrease in system capacity, with the result that the fuel pressure is substantially reduced, the engine of the “choking”, and the normal idle is lost.

With the tightness of the connection of the controller with ramp air pressure may drop, which again will reduce the fuel pressure.

What you need to check the pressure in the system

To ensure correct working (malfunction) of RDT, as well as the entire fuel system, it is necessary to determine the amount of fuel pressure. Naturally, this will need a special tool. It's Called a fuel pressure gage. Better if it will have mechanical design and scale up to 10 kg/sq cm. Except the fuel gauge will need:

• Cut the high pressure hose (inner diameter 8-10 mm);
• Some relevant diameter hose clamps;
• Pliers;
• Screwdriver
• Protective cap for plugs;
• Capacity for collecting fuel;
• Dry clean cloth.

Modes of pressure measurements

Before you test the fuel rail pressure, not the superfluous will learn, how this process is carried out. To be able to more accurately determine a possible malfunction, the pressure measurements must be performed in several modes:

• Ignition on (without starting the power unit);
• With the engine running at idle speed;
• Disconnected from the regulator vacuum hose (to verify RDT);
• With a blocked hose back flow of fuel;
• In the mode of double-declutching.

What should be the pressure measurements in different modes

According to information of the manufacturer for VAZ-2114, the pressure in the fuel rail shall be:

• Ignition – 2.9 to 3.0 kg/cm sq.;
• When the engine is running – at least 2.5 kg/cm square;
• With the disconnected vacuum hose – 3.3 kg/sq cm.;
• With a blocked hose, back flow – 7.0 kg/cm sq.;
• When blipping– 3.0 a–2.5 kg/sq cm.

How to check the fuel rail pressure

The Procedure for measuring the pressure following. To one end of the hose connected fuel pressure gauge, fix the connection clamp. Unscrew the cap on the fuel rail (on the side opposite to the one where you installed RTD). Substitute for fitting a tank for collecting fuel. A cap for the nipple press on the center tab, pitting thus the fuel pressure in the system. This process is required! Next, without removing the tank, Unscrew the locking nipple completely.

When remaining fuel will drain into the container, put on the fitting the other end of the hose and fix its collar. Turn on the ignition and wait until the fuel pump will pump fuel into the system. Check the pressure and compare it with recommended.

After this, run the engine and measure at idle. Verifying fuel pressure regulator is when you disconnected the vacuum hose and operating the power unit. If the pressure is increased to 3.3 kg/cm sq, the controller can be considered serviceable. If it is not changed, RDT, most likely, fallen into disrepair.

Similarly, measure the pressure at the blocked hose “return”, and in the mode of double-declutching.

Repair or replacement

If the test confirmed the failure of RDT, it must either be repaired or replaced. However, it should be noted that to buy any parts to this device is simply impossible, so it is much easier to buy a new fuel pressure regulator VAZ-2114, the price of which does not exceed 800 rubles.

Replacement RDT

Replace the RDT can be performed with the removed fuel rail, and without the need for disassembly. The latter option is more preferable as it requires less time. But before you remove the fuel rail or the regulator, don't forget to reduce the pressure in the system as described above! Otherwise, the whole engine compartment splattered with gasoline.

So, consider how the replacement of the fuel pressure regulator VAZ-2114 without removing the rail. This will require:

• The key to “10”;
• The key to “17”;
• The key to “24”;
• The hex on “5”;
• Screwdriver with a cross bat;
• Clean, dry rag.

Order of execution

1. First disconnect the negative terminal from the battery (key on “10”).
2. Disconnect regulator vacuum hose from intake manifold fitting.
3. With the key on “17” Unscrew the nut securing the drain hose. Disconnect the hose.
4. Phillips screwdriver Unscrew the bolt retaining plate return pipe.
5. Using the hex key on “5” turns the screws fixing the RDT to the fuel rail.
6. The Key to “24” Unscrew the nut that connects the fitting to the drain hose and the RDT.
7. Remove the fuel pressure regulator.

Here, in principle, and the whole process. The RTD installation is in the reverse order. It is important not to lose the rubber seal supplied with the controller. Without it, the RDT connection and the fuel rail is leaking, which will lead to a change in the value of the working pressure in the system.

Some tips

In order For the fuel pressure regulator did not bring you into trouble and worked for as long as possible, try these tips.

1. Preparing to replace RDT, buy only branded device recommended by the manufacturer.
2. Pour in the tank of a vehicle only high-quality fuel. Do not use fuel additives of unknown production.
3. Don't forget to replace the fuel filter.
4. Each time you check the pressure of fuel in the system. In identifying problems in a timely manner to eliminate them.
5. Discovering problems with the regulator, do not pull with his replacement.