9.1.9. Power supply system

Features of the device

Fig. 9.13. Fuel tank and fuel-supply lines: 1 – filter of thin purification of fuel; 2 – a fuel supply hose to the fuel pump; 3 – fuel pump; 4 – backpressure valve; 5 – a hose of discharge of fuel from the carburetor; 6 – carburetor; 7 – fuel discharge tube; 8 – a fuel supply tube from a tank; 9 – the fuel level sensor in a tank; 10 – separator; 11 – arm of fastening of a separator; 12 – stopper of the fuel tank; 13 – separator hose; 14 – bulk pipe; 15 – hose of a bulk pipe; 16 – fuel tank; 17 – collar of fastening of a tank; 18 – double-thread valve

Power supply system with the return discharge of a part of fuel from the carburetor 6 (fig. 9.13) through the calibrated carburetor branch pipe opening in the fuel tank 16. On a hose 5 the backpressure valve 4 which is not allowing discharge of fuel in a tank from the carburetor fastens.
The fuel tank is established under a body floor. Buck a hose 13 unites to a non-demountable separator 10 in which gasoline vapors, being condensed, come back to a tank. For alignment of pressure in the fuel tank on a ventilating hose of a separator the double-thread valve 18 is installed.
Air in cylinders of the engine moves through the temperature regulator maintaining air temperature on an entrance to the carburetor in certain limits.
Drive of management of butterfly valves of the carburetor foot, hummock.

Air filter and temperature regulator

Fig. 9.14. Air filter and temperature regulator: 1 – zabornik of cold air; 2 – a corrugated hose of a zabornik of the warmed-up air; 3 – temperature regulator; 4 – case; 5 – the filtering element; 6 – cover

Removal and installation. For removal of the air filter wring out spring holders and turn off a nut of fastening of a cover of 6 (fig. 9.14). Uncover and take out the filtering element.
Turn off nuts of fastening of the case 4 filters to the carburetor. Remove the case assembled with a temperature regulator 3 and disconnect a corrugated hose 2, having weakened a fastening collar.
Weaken a coupling bolt and remove a temperature regulator with a zabornik of 1 cold air.
At installation of the air filter for reduction of noise of an admission the cover 6 has to be put so that shooters on a reception branch pipe of the case 4 and the cover were directed towards each other.
Check of work of a temperature regulator. Check position of the gate at the removed temperature regulator at temperatures of 25 °C and 35 °C. In the first case the gate has to block completely a branch pipe of supply of cold air, in the second — a branch pipe of supply of the warmed-up air. If there is no it, adjust its situation rotation of a thermopower element and repeat check. Upon termination of check seal up a temperature regulator putting enamel on a rod of a thermopower element.

Fuel tank
Removal and installation
For removal of the fuel tank 16 (see fig. 9.13) disconnect a mass wire from the rechargeable battery.
Lift a pillow of a back seat, a rug of a floor and uncover the hatch located in a floor.
Disconnect electric wires and hoses from the fuel level sensor 9.
Weaken collars of the 17th fastening of the fuel tank, disconnect hoses 13 and 15, remove a tank. Merge the gasoline remains from a tank.
Carry out installation of a tank in the return sequence.
Cleaning and control
Remove the fuel level sensor 9 from a tank. For removal of pollution and deposits wash out a tank detergents (Lobomid, "ML", "MS"). Then a stream of hot water wash out and steam a tank for removal of the remains of detergent.

It is possible to solder only well washed out and steamed tank which is not containing gasoline vapors that there was no ignition and explosion at the soldering.

Carefully examine a tank in the area of a joint and be convinced of lack of a leak. Solder the found places of a leak on a joint soft solder.

Fuel pump

Fig. 9.15. Fuel pump: 1 – delivery branch pipe; 2 – filter; 3 – top case; 4 – the soaking-up branch pipe; 5 – cover; 6 – the soaking-up valve; 7 – rod; 8 – lever of manual pumping of fuel; 9 – spring; 10 – cam; 11 – balance weight; 12 – lever of mechanical pumping of fuel; 13 – lower case; 14 – internal remote laying; 15 – external remote laying; 16 – delivery valve

The device of the fuel pump is shown in fig. 9.15.
Check of the pump
Insufficient intake of fuel in the carburetor can be caused by malfunction of the fuel pump, and also a contamination or damage of fuel-supply lines and the fuel filter of thin cleaning.
For definition of a cause of defect disconnect a hose from a delivery branch pipe 1 and by means of the lever 8 of manual pumping of fuel check whether fuel moves. If fuel does not move, then disconnect a hose from the soaking-up branch pipe 4 and check whether depression on an entrance of this branch pipe is created. In the presence of depression fuel-supply lines or the filter of thin purification of fuel can be damaged or littered. If there is no depression, then the pump is faulty.
The fuel pump can be checked at the stand. Rotating the roller of the drive having eccentricity of 1,25 mm with a frequency (2000±40) min.-1, check fuel supply by the pump which has to be not less than 1 l/min at 20 °C. Forcing pressure at zero supply of fuel has to be 0,02–0,03 MPas (0,21–0,30 kgfs/cm2).
At malfunction of the pump sort and check its details.
Dismantling, cleaning, check and assembly of the fuel pump
For dismantling turn out a bolt of fastening of a cover 5, remove a cover and the filter 2 pumps. Then turn out screws of fastening of the top case 3 to the lower case 13, separate them, take out knot of diaphragms and a spring.
Wash out gasoline all details and blow compressed air.
Check technical condition of details. Cracks and fiascos of case details, leakage of the soaking-up and delivery valves are inadmissible. Soaking up 4 and delivery 1 branch pipes should not be turned in seats or have axial movement. Diaphragms should not have gaps, peelings and hardenings, the filter has to be pure, without gaps and damages. The sealing edge of the filter on perimeter has to be equal. Valves 6 and 16 of the pump should not jam.
After check replace all worn-out details new. Replace the damaged laying of the pump new and at installation of the pump grease with a thin layer of lubricant.
Installation of the pump on the engine

Fig. 9.16. Scheme of control and adjustment of a vystupaniye of a pusher of the drive of the pump: And — laying 0,27-0,33 mm thick; B — laying 0,79-0,80 mm thick; and — a pusher vystupaniye

The scheme of installation of the pump is shown in fig. 9.16. For installation of the pump use two of three laying: And — 0,27-0,33 mm thick; B – 0,70-0,80 mm thick; In — 1,10-1,30 mm thick.
Carry out installation in the following order.
Establish a heat-insulating pro-rate, having put under it laying And, and on the plane adjoining to the pump, place laying B.
Adaptation 67.7834.9506 measure distance "and" (the minimum size at which the pusher acts, established by a slow provorachivaniye of a bent shaft). If the size "an" is in limits of 0,8-1,3 mm, then fix the pump on the engine; if replace the size "a" less than 0,8, then laying of B with laying And; if "and" it is more than 1,3 mm, then replace laying of B with laying of Century.
Double-check the size "an" and fix the pump on the engine.