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4-4-snyatie-i-ustanovka-toplivnogo-nasosa-promezhutochnogo-nasosa-i.html
4.4. Removal and installation of the fuel pump, intermediate pump and fuel level sensor
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Fuel is extremely inflammable, therefore working with any part of fuel system, observe additional precautionary measures. Do not smoke, do not allow emergence near a working zone of open fire or a lamp without a plafond. Also do not work in garage where the equipment on natural gas with a match is applied. |
Fuel pump (carburetor engines)
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- Disconnect a negative wire of the storage battery. Disconnect from the pump both of a hose and turn on and remove two fixing nuts.
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- Carefully take from a head of cylinders the fuel pump. If it jams, it is possible to strike slightly with wooden whetstone on a thick pro-rate.
- Remove two thin laying.
- The fuel pump is pressurized and replacement of internal components is impossible. In case of internal breakage the pump replace.
- Installation is return to removal procedure, however, replace thin laying from both parties of a pro-rate. and evenly tighten with specified in the Size table and adjusting data at the end of the Management of effort of a nut. Under no circumstances do not change thickness of a pro-rate, differently operation of the pump will be broken.
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The fuel pump (engines with injection system)
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On late models with Motronic system the fuel pump is located in a fuel tank or near a fuel tank on models with L-Jetronic system. Early models are also equipped with the intermediate pump located in a fuel tank. The intermediate pump feeds more powerful main pump which provides the high pressure demanded for the correct work of fuel system. |
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On early models in a fuel tank together with the intermediate pump the fuel level sensor, and on late models - together with the main fuel pump is located. |
Outwardly located fuel pump
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- Lift the car and establish it on supports.
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- Remove two rubber covers (are specified by shooters), protecting sockets of the fuel pump, and disconnect from the pump cables.
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- By means of clips for hoses press fuel hoses from both parties of the fuel pump. If there are no clips, wrap up hoses rags and clamp them замостопорящимися flat-nose pliers, having tightened them so to block a fuel effluence.
- Disconnect from the fuel pump hoses.
- Remove screws of fastening of the fuel pump and take the pump from under the car.
- Installation is return to removal procedure.
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The located in tank fuel or intermediate pump
On some models access to the fuel pump is provided with removal of a back seat. On other models access is reached by removal in a luggage compartment of a rug.
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- Unscrew screws of a cover of the fuel pump (are specified by shooters) and uncover a car floor (on some models the fuel pump is located under a back seat, on others - in a luggage compartment).
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- Uncover.
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- Find electric sockets of the fuel pump (1) and the fuel level sensor (2) and отстыкуйте them.
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- For an otstykovyvaniye of the socket pick up a bracket that the ledge was combined with a groove, and remove the socket from knot
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- Also disconnect entrance and target fuel lines.
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- On models with the lock to a knot reversing from under ledges apply two screw-drivers
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- On models of fastening by nuts for removal of knot from a fuel tank unscrew nuts (are specified by shooters)
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- On the late Motronic models first of all remove the fuel level sensor...
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... then up directly take from a tank bottom the fuel pump (keep all fuel lines together)
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General view of knot of the fuel pump on late systems Motronic. |
- On early models remove screws and collars of fastening of the intermediate pump and separate the pump from knot.
- Installation is return to removal. If laying between the fuel pump and a fuel tank dried, is burst or damaged, replace it.
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Check of functioning and fuel level sensor replacement
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- Remove the main fuel pump or the intermediate pump (as it is described above) together with the fuel level sensor.
- Connect to contacts an ohmmeter and check correctness of resistance.
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- For L-Jetronic systems and the early Motronic models address to the mentioned below table.
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- In case of late models of Motronic systems connect an ohmmeter to the contacts of the fuel level sensor corresponding to contacts 1 and 3 electric sockets. When lifting a plunzher resistance should decrease.
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L-Jetronic systems and early Motronic
| Contact |
Provision of a float |
Resistance |
| G and 31 |
Slowly move from the situation EMTY (Empty) to the situation FULL (Full)
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EMPTY (Empty)
FULL (Full) |
Resistance slowly falls |
| W and 31 |
EMPTY (Empty) (Prevention of small amount of fuel) |
3.2 ±0.7 Ohm
71.7 ±2.3 Ohm
Infinity |
- If sizes of resistance wrong, replace the sensor.
- Installation is return to removal.
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