UAZ -374195 Operation Manual page 66

To be flushed, the fuel tanks shall be dismantled from the motor
vehicle.
Electric fuel pump. Regularly check and clean fuel pump pins and
connections to the onboard power supply.
Pay special attention to reliability of the ground connection.
It is not recommended to operate the motor vehicle if there is less
than 5 liters of fuel in the left fuel tank.
When crossing steep climbs, there must be at least 20 liters of
fuel in the right tank.
Clogging of the fuel pump strainer, final fuel filter, presence of
dirt and mechanical admixtures in a fuel tank are manifested first
of all in the impeded fuel pumping from the left tank into the right
one, unstable engine operation at high loads, and degradation of the
motor vehicle performance. If such signs arise, seek service station
help in order to prevent the fuel pump failure.
The following works shall be done at the service station:
- disconnect fuel supply and return pipes;
- dismount the left fuel tank;
- dismount the submersible module;
- flush the fuel tank with clean gasoline and dry it out (e.g., wipe with
a lint-free rag);
- remove the electric fuel pump intake barrel and flush it;
- flush the filter screen (do not remove the filter screen from the
electric fuel pump, otherwise the manufacturer's warranty
becomes void);
- install the electric fuel pump into the fuel tank (pay attention to sealing
ring installation, it shall be dry);
If the engine works the same after the above measures, i.e. its operation
is unstable, the following shall be done:
1. Replace the fine fuel filter.
2. Make sure the fuel is in the main fuel tank. The minimum amount —
10 l (for checking purposes only).
3. Measure the fuel system pressure at idle:
a) at 800 rpm and at 2000...2500 rpm (about 2.6...2.7 kgf/cm
b) at a sharp brief throttle opening (a surge to 3.0 kgf/cm
c) at the ignition on and the engine stopped — 3.0...3.15 kgf/cm
4. Check cleanliness of the jet pump nozzle.
66
);
2
);
2
.
2