The tanks are attached to the frame spars from the outside using brackets and clamps. Cardboard spacers are placed between the clamps and the tank

The tanks are connected by fuel lines to a switch valve installed under the driver's seat. With it, you can switch the fuel intake from one tank to another.

The capacity of one tank is 39 liters.

UAZ power system

At the top of each tank there is a fuel pickup, consisting of a tube and a brass mesh filter, as well as an electric fuel gauge sensor.

In some modifications, a drain hole with a threaded plug is located at the bottom of the tank.

The plastic filler cap has inlet and outlet valves to prevent underpressure and overpressure inside the tank.

On some vehicles, the fuel filler neck is equipped with a retractable pipe for easy refueling.

From the outside, the fuel filler hatch is closed with a cap.

The fuel lines are made of rubber hoses and a copper tube.

The hoses are connected to the fuel pump, the fuel tank switching valve, the sediment filter through fittings with union nuts.

On the branch pipes of the fuel intakes, the carburetor and the fuel fine filter, the hoses are fixed with clamps.

A copper tube is connected at one end through a fitting to a sediment filter, and at the other end is inserted into a rubber hose and tightened with a clamp.

Maintenance of fuel tanks consists in periodically draining sludge and water from them, washing the removable filters of the fuel line receiving tubes and the tanks themselves.

Periodically check the reliability of the fastening of the tanks and, if necessary, tighten the bolts of their fastening.

To flush the fuel tanks, remove them from the vehicle.

Before removing the tank from the vehicle, do the following:

- disconnect the battery;

- open the hatch in the floor of the body above the fuel gauge sensor and the fuel pipe;

- disconnect the wire from the fuel gauge sensor and insulate it;

- Disconnect the fuel pipe from the flange of the receiving pipe.

Then unscrew the bolts of the clamps and bend the clamps down so that they do not interfere with the lowering of the tank.

Remove the tank, clean it and the pickup tube filter with clean gasoline or hot water and blow it out with compressed air.

Flushing the intake tube filter can be done without removing the tank from the vehicle, while removing the tube with the filter through the hatch in the floor of the body.

Fuel cap service

Keep the fuel tank cap clean and ensure that the vent hole in the center of the cap is not clogged with dirt; clean it if necessary.

For the normal operation of the power supply system in high-temperature conditions, timely operation of the plug valves is important. Therefore, before the onset of the hot season, check their work.

Checking the operation of the fuel cap valves

Fig. 1. Scheme for checking the operation of the valves of the fuel tank cap: A - compressed air supply; 1 – fuel tank; 2 - micromanometer; 3 - crane

To determine the timing of the release valve, connect as shown in fig. 1 diagram of the fuel tank to the compressor, open valve 3 and turn on the compressor.

Then, slowly closing the valve, increase the pressure in the tank and follow the readings of the micromanometer 2.

The pressure in the tank should drop when the outlet valve opens.

To check the operation of the intake valve, connect the fuel tank in the same way to the vacuum pump.

The further verification procedure is similar to that described above.

If the exhaust valve opens at a pressure less than 0.78 kPa (0.008 kgf/cm 2) and more than 4.9 kPa (0.05 kgf/cm 2) or the inlet opens at a vacuum of more than 2.7 kPa (0.03 kgf / cm 2), then replace the plug.