Fuel pressure regulator

    The biggest problem is the engine fuel pressure regulator, which is responsible for maintaining proper pressure in the injection strip by established curve depending on engine speed and load. Unfortunately, most regulators have a manufacturing defect, which is often caused jams regulator which resulted in the emergency engine shutdown.
     The reason is the use of thermoplastic material which, under the influence of high temperature and gasoline over time loses its original properties. Added to this is the precipitate from the fuel deposition on the walls, which sometimes makes it difficult to move the piston in the control (the gap between the plunger and the sleeve is 0.05 mm). There have been cases where controllers were replaced up to six times per year, thankfully under warranty. In addition, these controls are accessible only by authorized service Renault at a price of about
£260. So far there have been no replacements controller. In addition, to have a one year warranty you need to put the controller on increasing costs almost to £360.
     Currently, regulators can be reconditioned. Recondition extends the life of the mechanical regulator to about 100.000-150.000 miles.

Regulators can also be purchased on the secondary market price of £20-£100 but this is risky, because a lot of broken controllers are sold by people who purchased new, and these are derived from dismantling a moment to stop working properly.
     Regulators are marked 8200206729 (Italy) 7700113483 (France) 226706542R (Germany) depending on the manufacturer, but they are all interchangeable. There is one exception to this rule, but the model is inconvertible rare and poorly working in Laguna II.

New production fuel pressure regulator from F5R Team UE116110PL. Produced with advanced technology from the highest quality materials.

Disassembly of pressure regulator

Very important!
The regulator can be removed only on a cold engine. To be safe, also have a fire extinguisher nearby. An attempt to remove the hot engine can cause a fire. The fuel is under high pressure and temperature is about 100 ° C. Unsealing of such a system leads to the immediate point of gasoline and throw it out, which can cause ignition and explosion of fumes or burns

After unscrewing the two torx screws turn the valve so that the ear overhanging the edge of the rail. Then questioning the ear pull valve up. Care should be taken not to tilt from side to side as the valve can easily damage the slot in the terminal. Installation is to push it vertically into the slot and tighten. Do not tilt the controller from side to side as this can cause abnormal position of the O-rings sealing. If a slot in the bottom of the controller is small scratch, leakage is impossible to obtain.

The original O-rings 7x1, 5 are replaced with fluorine FKM 7.1 x1, 6 O-rings are about 0.1 mm thick which facilitates sealing, but makes it difficult to install. If the O-ring will not come under the pressure of a finger, remove the regulator and see if there is a damaged area of ​​the nest. Pressing the power or pile driving will destroy the O-ring. Before putting the O-rings on the regulator should be greased with grease to ease installation, before putting the controller into the slot to lubricate them again, makes it easy to press the control and prevents curling them during pressing.

The tightness of the system is essential for the proper operation and safety. Therefore, the service procedure Renault does not provide the regulator removal and replacement with only the injection rail. This is due to the difficulty in obtaining adequate seal the connection and the possibility of damage to the socket terminal. Hot gas under high pressure has very good penetrating even the smallest gap is not a problem for her. Therefore, all the operations you perform at your own risk.

After attaching the regulator can start the engine. Must be carefully monitored around the valve for leaks. It should be noted that the fuel escapes from the pressure of leaking in the form of evaporated, so they are easier to detect than the show.

After igniting the engine exhaust injection system and because of the strange little design can take a long time. The regulator is like a glass turned upside-down, so the air collects at the top of the regulator, and is compressed to about 100 bar. It was only under the influence of the control piston moves slowly escapes through the drain valve. Unfortunately, the fuel system has no return line to the tank and air from the controller returns back to the high pressure pump and then back to the injection rail. The result is that air circulates in the system until it is pushed out by the injectors. This can cause the engine to run rough initially, or the lighting of the lights of the injection system (emergency mode transition depending on the version). Sometimes it takes a few minutes, but can take longer. After the engine has warmed up fully (include fan) bleeding should be over. There are cases, however, it was only after a long ride will be the final vent.

If the venting system at idle still lights up the injection system, and the addition of gas or off depending on the version of the software goes into emergency mode, this indicates a low leakage (less) o-ring controller (if before injection system worked correctly) or damaged surfaces cooperating with the O-ring when removing or installing the controller. It is recommended to use a fluorine FKM-rings that withstand temperatures up to 200 ° C and are resistant to gasoline. In the event of difficulties in sealing can also be used a special rubber O-rings with high hardness (80 ° Shor'a scale). Original rubber O-rings rather be treated as disposable because they are often the cause of the leak.

Regulator control

The pressure regulator is controlled from the computer PWM power supply. Operating frequency is 400 Hz. Value of the RCO (PR484) should be during operation 35 +/- 10% (25-45%). Wherein RCO is lower than fuel system is in better condition and in the case of a new high-pressure pump and the new regulator is even below 25%. After the engine has warmed up RCO value increases by a few percent due to a decrease in the magnetic efficiency of the regulator. During start-up RCO is 70%.
The value can be measured using the Clip or a majority of the new multimeter function Hz /%.

Regulators F5R Team have higher magnetic efficiency resulting in a slightly lower RCO compared to the original regulators. The difference is approx. 3%. This results later in conversion parameter constant correction pressure PR485 on the above value.

Damaged outlet pressure regulator

Damaged seat by tilting the controller from side to side during removal. In this slot can not be put o-ring without damaging it. Obtaining a leak is almost impossible.

Damage to the surface of the O-ring contact. The damage is minor, but the engine does not idle pressure and maintain adequate indicator lights up injection

Damage to the contact surface ofthe lower o-ring. Visible trace of hammering a screwdriver between the strip and the regulator. In this case, it is not possible to obtain a tight joint. Injection rail is suitable for exchange.

Damaged valve of the regulator

Damaged socket ball valve of the regulator

Damaged socket ball valve of the regulator (oval)

Damaged ball of the valve

Graph of the regulator

Graph of the fuel pressure regulator at the constant pressure 100 bar.