In the article we will consider how to check the fuel pressure and reset the fuel pressure in the engine power system

Fuel pressure check

If there is insufficient fuel pressure in the fuel ramp, then it is possible:

- engine idling;

- unstable engine operation;

- increased or decreased speed of rotation of the crankshaft at idle;

- poor engine pick-up (the engine does not develop full power);

- jerks and failures in the engine operation when the car is moving

Before checking, it is necessary to check the reliability of the electrical contacts in the pads of the wires of the injection system components responsible for the fuel supply (fuel pump, injectors)

How to check and reduce the fuel pressure of a Mazda 6

To check the fuel pressure, you need a pressure gauge (with a measurement limit of at least 5 kgf / cm2) with a hose for connection to the fuel line

Turn on the ignition and listen: the sound of the electric fuel pump should be heard for a few seconds. If you can"t hear it, you need to check the electrical circuit of the pump

The electric fuel pump does not turn on if there is pressure in the fuel supply system

We reset the fuel pressure as described below

How to check and reduce the fuel pressure of a Mazda 6

We disconnect the fuel supply pipeline from the fuel ramp by sliding the clamps of the coupling

Connect the pressure gauge between the fuel supply pipeline and the fuel ramp

When the engine is idling, the fuel pressure in the fuel line must be at least 365 kPa (3.65 kgf/cm2)

The following reasons for pressure reduction are possible:

How to check and reduce the fuel pressure of a Mazda 6How to check and reduce the fuel pressure of a Mazda 6

- the fuel pressure regulator is faulty (it is installed in the fuel module);

- the fine filter is clogged (installed in the fuel module);

How to check and reduce the fuel pressure of a Mazda 6How to check and reduce the fuel pressure of a Mazda 6

- the coarse fuel filter is clogged;

- the electric fuel pump is faulty.

Reduction of fuel pressure in the power supply system

It is necessary to reset or reduce the fuel pressure when disconnecting the fuel system elements

Preparing the car

Turn off the ignition and open the hood by pulling the handle of the hood lock drive

We press the lever, remove the safety hook from the lock and install the hood on the stop

Disconnect the negative battery terminal

How to check and reduce the fuel pressure of a Mazda 6

Turn off the fuel pump by removing the fuse or the fuel pump relay in the mounting block in the engine compartment

How to check and reduce the fuel pressure of a Mazda 6

On the back cover of the fuse box in the engine compartment there is a diagram of the location of the fuses and relays

Connect the negative wire to the battery and start the engine

We let the engine run until the fuel is fully exhausted from the fuel ramp, after that the engine will stall

Turn off the ignition. Now it is possible to disconnect fuel lines