Mazda 626

1991-1998 of release

Repair and operation of the car

Mazda 626

+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engines
+ 4. Heating and ventilation
- 5. Fuel system
   + 5.1. Nikki 30/34 carburetor
   + 5.2. Power supply system (l engines 1,6 and 1,8)
   - 5.3. Power supply system (l engines 2,0 and 2,5)
      5.3.1. Introduction
      5.3.2. Technical characteristics
      5.3.3. Dumping of pressure in fuel system
      5.3.4. Fuel pump and fuel pressure
      5.3.5. Fuel tubes and connections of tubes
      5.3.6. Fuel level measuring instrument sensor
      5.3.7. Fuel tank
      5.3.8. Casing of the air filter
      5.3.9. Accelerator rope
      5.3.10. Electronic system of injection of fuel
      5.3.11. Casing of a butterfly valve
      5.3.12. Fuel pressure regulator
      5.3.13. Fuel highway and injectors
+ 6. Exhaust system
+ 7. Transmissions
+ 8. Coupling and half shafts
+ 9. Brake system
+ 10. Running gear
+ 11. Body
+ 12. Electric equipment
+ 13. Electrical circuitries
+ 14. Useful tips


5.3.4. Fuel pump and fuel pressure


Set for check of the majority of fuel systems

General check

1. Check that in the fuel tank there was enough fuel.
2. Check whether the fuel pump works. Include ignition and listen to a mouth of the fuel tank, you have to hear the short buzzing sound. If the pump does not work, check an electric chain of the pump.
3. In the Probe models first of all check the switch with a delay mechanism located in the luggage compartment.

Check of pressure

1. Disconnect the working mechanism of system a control cruise.
2. Connect pressure measuring instrument to the hose conducting from the fuel filter (4-cylinder models) or between fuel tubes.
3. Include ignition (the engine does not work, the air conditioning system is switched-off). The fuel pump has to turn on approximately for two seconds. Pressure in system has to increase and keep on one mark.
4. Start the engine and warm up it up to the normal temperature. Write down indications of the measuring instrument and compare them to technical requirements. Disconnect a vacuum hose from the fuel pressure regulator – pressure has to instantly will increase. If you received all necessary results, so the system functions correctly.
5. If after a detachment of a vacuum hose pressure in system did not increase, increase discharge in the regulator of pressure having connected to it the vacuum pump. If pressure of fuel went down, so vacuum does not move in the regulator through a vacuum hose. If pressure did not go down, replace the fuel pressure regulator.
6. If pressure of fuel does not conform to technical requirements:
a) Pressure is too high. Check whether vacuum in the fuel pressure regulator moves. If vacuum moves, check whether the hose or a tube of return of fuel is littered. If the hose is not littered and not передавлен, replace the regulator.
b) Pressure is too low. Replace the fuel filter. If pressure did not increase, start the engine and block a fuel return hose. If pressure increases higher than 47 psi, replace the regulator.
c) If pressure still low, check whether the injector or injectors proceeds. Check serviceability of the fuel pump.

Check of an electric chain of the fuel pump

1. If the pump does not work, check its safety lock in the block of fuses. If necessary replace a safety lock.
Model 1993-1997 of years
2. If the pump still does not work, uncover the block of signaling located in office of the engine and close a crossing point contacts of the fuel pump and grounding. The fuel pump has to start working.
Models of 1998
3. If the pump still does not work, remove the pump relay from the relay block. Close a crossing point contacts of the 30 and 87 nest of the relay.
All models
4. If the pump does not turn on, check whether tension on contacts of the pump moves, and whether there is no gap in a chain of grounding of the pump. If check showed positive results, replace the pump.

Removal and installation

1. Disconnect a wire of the minus plug of the accumulator.
2. Lower pressure in system.
3. Remove the fuel tank.
4. Disconnect wires and fuel tubes from the pump.
5. Remove a lock ring of the pump.
6. Get the pump from the fuel tank.
7. Weaken clips of a hose and disconnect it from the pump.
8. Disconnect the socket from the fuel pump.
9. Remove a lock ring and the filter.
10. Disconnect the pump from its arm.
11. Installation is carried out upside-down removals.

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