Genuine Mazda RX-7 Fuel Pump

Mazda RX-7 Fuel Pump Parts and Q&A

• Fuel Pump
  N326-13-350A
  Q: What are the tests for checking the fuel pump and how should they be performed on Mazda RX-7?

  A:

  The fuel pump has two tests, which are pressure test with a pressure gauge, and the volume test to check the amount of discharged fuel at the carburetor. Prior to conducting any of the tests, it is important to ensure that the fuel filter is not clogged and it has been replaced within the recommended time. Procedures To verify the presence of pressure, firstly, dissolve the air cleaner assembly and disconnect the main fuel hose at the carburetor, which is the larger of the two hoses. Prepare a small container and rags to receive the excess fuel when the hose is removed and it is always important to confirm that the engine is cool. Attach a pressure gauge, hose restrictor and flexible hoses to release the fuel into an appropriate container. Switch the ignition switch on and empty the system through the hose restrictor into the container. Turn the restrictor closed and wait until the pressure in the system reaches equilibrium and record the pressure in the system on the pressure gauge; the fuel pressure is 3.7 to 4.7 lb/in 2 between 0.26 to 0.33 Kg/cm 2. Should the pump not be to specification replace it with a new one otherwise, to volume test. To check the volume, put the disconnected main fuel hose in a graduated container, switch ignition to on and open the hose restrictor and squeegee the fuel out of the hose into the graduated container. Then, after one minute (exactly one minute), 1100 cc (1.16 US quarts, 0.97 Imp quarts) or more must have been emptied; otherwise change the fuel filter to a new one.
• Fuel Pump
  N351-13-35ZB
  Q: How does the electric fuel pump operate and How to install and maintain on Mazda RX-7?

  A:

  Electric fuel pump is turned on every time the ignition key is in the on position and it is at the back of the car and it is safeguarded by two sheet metal covers. The wiring will be installed on the floorboard to the driver compartment at the back of the seat and needs to get the rear floor mat and sheet metal floor plate removed to expose the electrical coupler, which will be disconnected and the wires will be passed through the floorboard. Once the vehicle is raised, the front cover is then removed by unscrewing two small bolts after which two bolts and one nut are removed that hold the main fuel pump cover in place, and the pump is then accessed without disturbing the hose connections. The hose that goes to the fuel filter and to the fuel cut valve should be noted and labeled with the help of the tape to be used so that they do not lose their direction when reassembling the system. One should have a container and rags ready to take any spillage of fuel during the disconnection of the hoses, which can be loosened using the pliers and then lifted and twisted off the pump, with the ends blocked to avoid spillage more fuel. The fuel pump may then be lifted of by screwing the two nuts on the bracket. To install the new pump, the pump must be set in the direction indicated by the directional indicators and then the attaching nuts used, then the inlet and outlet hoses should be reconnected and connectors returned to their initial positions. The wiring is to be carried through the body grommet to the passenger compartment and then the assembly should be raised and the main fuel pump cover fixed in place using bolts and nut, and then the smaller front cover. Once the vehicle is down, it should be connected to the electrical coupler, the floor plate should be installed once more and the floor cover restored to its original location. Lastly, turning on the engine will enable the test on fuel pump leaks.