Genuine 1986 Mazda B2000 Fuel Pump

1986 Mazda B2000 Fuel Pump Parts and Q&A

• Q: What are the fuel pump mounting locations and testing procedures in Carbureted Fuel system on 1986 Mazda B2000?

  A: All models until 1984 have the pump mounted on the left frame rail beside the fuel tank with the 1987-88 2,555cc models and 1987-88 2,184cc models with automatic transmission having the pump located in the fuel tank, and 1987-88 2,184cc models with manual transmission use a mechanical fuel pump. A current to the electric pump is fed via the ignition circuit so that you can operate personally by keeping the key in the RUN position. To check the operating condition of the fuel pump both volume and pressure tests are recommended by installing both the pump and the engine at normal operating temperature and idle speed but under the condition that the fuel filter has been replaced within the recommended timeframe. In the pressure test, the air cleaner is taken off, the fuel inlet line is detached and a pressure gauge, restrictor and a flexible hose is attached between the fuel filter and carburetor and the fuel is allowed to discharge into a graduated container. Once the system has been vented, the pressure is to be maintained at a constant of 2.8-3.6 psi or 3.6-5.0 psi on the Rotary Pick-Up; otherwise, the pump might require replacement. To test the volume, the hose dam is opened to empty fuel in a container, and the speculated amount will be about 2 pints or 1.2 quarts in the Rotary Pick-Up. In case the volume is lower than specified, it should be examined with a supplementing supply of fuel and replacement with a new filter; otherwise, restrictions in the fuel lines may occur. To remove and install, the fuel pump shield is taken off, the electrical leads and inlet/outlet lines dissolved and the pump is unbolted out of the mounting bracket on the 1971-84 models. To access the pump of 1987-86 models, the fuel tank needs to be removed, this requires a precise counterclockwise tapping of the lock ring and disconnecting the fuel fitting and removing the pump together with the o-ring seal. It would take cleaning the area of the pump seal, installing a new o-ring seal, and attaching the reservoir hose, snapping the pump into place with the locking ring, and repairing the fuel tank.