5.7.3. Replacement of the fuel pump/gauge of a fuel tank
The fuel pump together with the tank gauge is in a fuel tank and is designated by firm Volkswagen, proceeding from a design, as a rule, as system of giving of fuel.
The gauge consists of a float and a potentiometer. At fall of level of fuel the gauge float falls and the potentiometer connected with a float increases electric resistance of the gauge. Thereof pressure on the index of the expense of the fuel, located on the panel of devices falls, — the arrow moves in a direction to a designation "Empty".
The fuel pump and the gauge of a fuel tank is better to dismantle in the open air. Fuel steams are poisonous and inflammable, therefore necessary safety measures are an indispensable condition for carrying out of such work.
At dismantle of the fuel pump it is necessary to execute the following:
- To disconnect the storage battery;
At a detachment of the storage battery the information from memory of electronic devices is erased, therefore check up, whether there is at you an autoradio tape recorder code. The storage battery is necessary for disconnecting only at the switched off ignition.
- To dismantle a cover located on the bottom of a luggage carrier;
- To disconnect a socket of the gauge of a tank and the fuel pump. For this purpose slightly to raise by means of a small screw-driver keeping ledges located on each side;
- After easing of collars of fastening of hoses to dismantle submitting and returnable fuel hoses. Places of connections are shown on fig. 121
, knot details топливоподачи
— on fig. 122
. To close apertures of hoses;
Fig. 121. Knot топливоподачи: 1 — a contact socket; 2 — a hose of giving of fuel; 3 — a hose of return of fuel; 4 — an adjusting label
Fig. 122. Knot details топливоподачи: 1 — накидная a nut, 20 Нм; 2 — a flange; 3 — сильфон (the contact to a tank is inadmissible); 4 — a sealing ring; 5 — сильфон (see poses. 3); 6 — knot топливоподачи; 7 — a hose of return of fuel, dark blue; 8 — the tank gauge
- To weaken by means of a special key накидную a nut 3217. If such key is not present, it is possible to take advantage of a wooden core, having put it to sides of a nut and slightly striking on a core a hammer;
- To take out a flange and a lining from a tank mouth;
- Turning топливоподающий knot counter-clockwise, to deduce it from байонетного a socket and to take out.
At installation of the fuel pump it is necessary to execute following operations:
- At installation of the fuel pump which was in the use it is necessary to merge from it fuel;
- To establish the pump in a fuel tank. A sealing ring to moisten before installation by engine oil. At installation to watch that the gauge of level of fuel was not deformed. At correct installation the gauge float is directed aside топливопроводов;
- To develop a flange to the right and to fix it with the help байонетного a
shutter. The arrow on a flange should specify towards a triangular label 4 (fig. 121
) in a tank;
- To screw and tighten накидную a nut;
- To attach submitting and returnable fuel hoses. Places of connections are designated by arrows. Besides, to establish a returnable fuel hose of blue colour. To tighten collars on hoses;
- To establish the tip and again to fix a cover;
- Again to connect the storage battery and to establish hours. To enter a code of the admission of a radio tape recorder.