Fuel pump filter: Difference between revisions
Ricebubbles (talk | contribs) (Started outline for Fuel Pump, Filter.) |
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= | ==Filter== | ||
= | <!-- GF47.20-P-4100-01M Fuel filter with integrated fuel pressure regulator position --> | ||
Fuel filter is located at frame floor on left anhead of rear axle. | |||
{| | |||
|[[File:W220_fuel_filter_location.jpg|300px|]] | |||
| | |||
* M3 - Fuel pump | |||
* 55/1 - Fuel filter with integrated fuel pressure regulator approx. 3.8 bars | |||
|} | |||
<!-- GF47.20-P-4100A Fuel filter with integrated fuel pressure regulator, location/task/design/function 18.3.08 --> | |||
The task of the fuel filter is to filter impurities out of the fuel, maintaining constant fuel pressure in wide limits irrespective of the fuel pump delivery. | |||
{| | |||
|[[File:W220_fuel_filter_design2.png|300px|]] | |||
| | |||
* 55/1 - Fuel filter with integrated fuel pressure regulator | |||
* CAN - Pressurization line | |||
* PUMP - Feed from fuel pump | |||
* TANK - Return flow to fuel tank | |||
* MOT - To engine | |||
|} | |||
<!-- GF47.20-P-4100-02A Fuel filter with integrated fuel pressure regulator, design --> | |||
<!-- GF47.20-P-4100-03A Fuel filter with integrated fuel pressure regulator, function --> | |||
{| | |||
|[[File:W220_fuel_filter_design.jpg|400px]] | |||
| | |||
* 55/1 - Fuel filter with integrated fuel pressure regulator | |||
* 55/3 - Valve | |||
* 55/5 - Diaphragm (membrane) | |||
* 55/6 - Compression (push) spring | |||
* 55/9 - Filter element insert | |||
* 55/40 - Diaphragm pressure regulator | |||
* A - Feed from fuel pump | |||
* b - Diaphragm pressure regulator vent line | |||
* B - Fuel return flow to fuel tank | |||
* C - Fuel pressure connection to engine | |||
|} | |||
The fuel filter consists of a sheet metal casing with an integrated filter | |||
element (55/9). The fuel flows through this from the outside to the | |||
inside. As a result any impurities are trapped. | |||
The diaphragm pressure regulator (55/40) controls the fuel pressure | |||
of approx. 3.8 bar (operating pessure) via the fuel return flow | |||
quantity to the fuel tank. | |||
If the set fuel pressure is exceeded, the diaphragm (55/5) is pushed | |||
against the push spring (55/6) and the valve (55/3) attached to the | |||
diaphragm opens the passage for the fuel return to the fuel tank (B). | |||
If the set pressure is below the limit, the valve is closed again by | |||
means of the push spring. | |||
{| | |||
|[[File:Fuel_pressure_as_a_function_of_the_fuel_pump_delivery.png|thumb|none|Fuel pressure as a function of the fuel pump delivery]] | |||
| | |||
* A - Fuel pressure in bar | |||
* B - Fuel pump delivery in liters per hour | |||
|} | |||
A greatly varying fuel pump delivery (e.g. 20 or 140 l/h) does not have any great effect on the fuel pressure. | |||
Revision as of 20:36, 7 May 2018
Fuel Pump
Description - Fuel Pump
Edit required.
Parts - Fuel Pump
Edit required.
Issues - Fuel Pump
Edit required.
DIY Procedures - Fuel Pump
Edit required.
Filter
Fuel filter is located at frame floor on left anhead of rear axle.
|
|
The task of the fuel filter is to filter impurities out of the fuel, maintaining constant fuel pressure in wide limits irrespective of the fuel pump delivery.
|
|
|
|
The fuel filter consists of a sheet metal casing with an integrated filter element (55/9). The fuel flows through this from the outside to the inside. As a result any impurities are trapped.
The diaphragm pressure regulator (55/40) controls the fuel pressure of approx. 3.8 bar (operating pessure) via the fuel return flow quantity to the fuel tank.
If the set fuel pressure is exceeded, the diaphragm (55/5) is pushed against the push spring (55/6) and the valve (55/3) attached to the diaphragm opens the passage for the fuel return to the fuel tank (B). If the set pressure is below the limit, the valve is closed again by means of the push spring.
 |
|
A greatly varying fuel pump delivery (e.g. 20 or 140 l/h) does not have any great effect on the fuel pressure.