Why do diesel engines have high pressure fuel injectors?
The fuel injection system lies at the very heart of the diesel engine. By pressurising and injecting the fuel, the system forces it into air that has been compressed to high pressure in the combustion chamber.
How does a diesel high pressure fuel pump work?
High-pressure fuel pumps are mechanical and are typically driven by a camshaft. A lobe on the camshaft pushes on a follower or roller that moves a piston. The piston in the pump has two cycles, suction and compression.
What are the requirements of diesel injection system?
Functional requirements of a fuel injection system
- Accurate metering of the fuel injected per cycle.
- Correct fuel injection timing.
- Full control over rate of fuel injection.
- Proper atomisation of the fuel.
- Proper spray pattern to ensure mixing of air and fuel.
- Uniform distribution of fuel in the combustion chamber.
Why is fuel injection pressure so high?
High injection pressures are used to vaporize the fuel to the maximum extent. This causes better mixing which in turn provides larges area of contact between the fuel drop and hot ambient air resulting in efficient combustion. Efficient combustion mean low CO, CO2 and better fuel economy.
Why do you need a high pressure fuel pump?
The purpose of the high-pressure fuel pump, in combination with the low-pressure fuel pump, is to provide gas to the vehicle’s engine from the tank. A failure of high-pressure fuel pump can have significant impacts on your vehicle’s performance.
How do you test a diesel injection pump?
The inj pump does all the really hard work of delivering the fuel to the cylinders via the injectors. To test the lift pump, once the engine is running, open the bleeder at the fuel filter. The engine should stay running and the fuel should really squirt out.
What are the requirements of fuel injection system for CI engines?
Proper atomization of fuel into very fine droplets. Proper spray pattern to ensure rapid mixing of fuel and air. Uniform distribution of fuel droplets throughout the combustion chamber • To supply equal quantities of metered fuel to all cylinders in case of multi-cylinder engines.
How do you reduce fuel pressure?
How to Reduce the Fuel Pressure in a Car
- Locate the rubber fuel hose that runs from the fuel pump to the carburetor.
- Install the proper size hose fittings in each end of the pressure regulator.
- Place a hose clamp over each end of the fuel hose.
- Tighten the hose clamps.