A fuel injection system is used to inject the fuel into a combustion chamber of an internal combustion engine.
All diesel engines used a fuel injection system but in a petrol engine, it is replaced by the carburetor.
Various types of fuel injection systems can be used in automobile engineering.
Some of them are continuous injection, direct injection, single-point injection, multi-point injection, etc.
Out of these fuel injection systems, Mico fuel Injection System is widely used in automotive engines.
Hence here I will cover details about Mico Fuel Injection System used for Multi-Cylinder Diesel Engines.
The fuel injection system consists of a Fuel Feed Pump and a Fuel Injection Pump. These parts are integrated into one body. The Fuel Feed Pump sucks the Fuel Oil from the fuel tank.
This still contains Air bubbles and Vapor, then the Pump supplies oil to the filter unit for purifying it.
The filter unit cleans the oil and further supplies it to the Fuel Injection Pump. Overflowed oil is sent back to Fuel Tank through the overflow valve provided on the filter unit.
An air vent screw is also provided by the Filter Unit for Air Venting.
The injection Pump has the main Crankshaft which is driven by power supplied by the Engine.
The number of Plunger quantities is equal to the number of Cylinder engines.
One Plunger supplies the fuel to one cylinder of the engine only, and each Plunger works as an individual Injection Pump.
Only Control Rod meshes with all the toothed quadrants of all the Pumps at the same time.
The Fuel which is coming from the Filter unit is compressed to the required pressure by these Plungers.
Then after it is supplied through a delivery pipe to the injector of the Engine at proper timing.
Separate overflow outlets are provided on each plunger to send back overflowed oil to Fuel Tank.
A Governor is also provided at the Injection Pump.
This actuates the control rod to govern the supply of oil through the plunger according to the demand of the Engine.
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