Fuel and
fuel system
INJECTORS
To test your
injectors, you have different ways, u can use noid light, multi meter or use a
screw driver to hear the injectors moving or spraying.
The primary
difference between carburetors and fuel injection is that fuel injection
atomizes the fuel by forcibly pumping it through a small nozzle under high
pressure, while a carburetor relies on suction created by intake air rushing
through to draw the fuel into the airstream.
Reflection
When using
the Noid light, you need to disconnect the sensor wire and plug the noid light
in, if it keeps flashing then its defiantly working. And need to check the
sensor wire, it should be around 5v. Injectors also need to spray equally, if
its blocked up then you need to replace it.
Testing
Emissions
Catalytic converter
The
catalytic converter is a device placed in the exhaust pipe, which converts
hydrocarbons, carbon monoxide, and NOx into less harmful gases by
using a combination of platinum, palladium and rhodium as catalyst.
Exhaust Gas Recirculation
Exhaust
neither burns nor supports combustion, so it dilutes the air/fuel charge to
reduce peak combustion chamber temperatures. This, in turn, reduces the
formation of Nitro oxide
Fuel Pump
A fuel
pump is a frequently (but not always) essential component on a car or other
internal combustion engine device. Many engines (older motorcycle engines in
particular) do not require any fuel pump at all, requiring only gravity to feed
fuel from the fuel tank through a line or hose to the engine. But in
non-gravity feed designs, fuel has to be pumped from the fuel tank to the
engine and delivered under low pressure to the carburetor or under high
pressure to the fuel injection system. Often, carbureted engines use low
pressure mechanical pumps that are mounted outside the fuel tank, whereas fuel
injected engines often use electric fuel pumps that are mounted inside the fuel
tank (and some fuel injected engines have two fuel pumps: one low pressure/high
volume supply pump in the tank and one high pressure/low volume pump on or near
the engine).
Diesel Glow Plug
Glow plugs
can be tested by, taking the glow plug out and putting 12volts on it. And if it
is working well it should get bright red within 10 seconds.
The engine
is unable to start, because it cannot generate and maintain enough heat for the
fuel to ignite. For that reason indirect injected diesel engines are
manufactured with glow-plugs in each pre chamber, and direct injected diesel
engines are manufactured with glow-plugs in each combustion chamber to heat up
the air.
Fuel Pressure regulator
SENSORS
Map: The manifold absolute pressure
sensor (MAP sensor) is one of the sensors used in an internal
combustion engines electronic control system. Engines that use a MAP sensor are
typically fuel injected. The manifold absolute pressure sensor provides
instantaneous manifold pressure information to the engine's electronic control
unit (ECU).
Maf: A mass air flow sensor is used to find
out the mass flow rate of air entering a fuel-injected internal combustion
engine. The air mass information is necessary for the engine control unit (ECU)
to balance and deliver the correct fuel mass to the engine
Tps: A throttle position sensor (TPS) is a sensor
used to monitor the position of the throttle in an internal combustion engine.
The sensor is usually located on the butterfly spindle so that it can directly
monitor the position of the throttle
Bleeding Diesel Engine
Here are the steps to take in bleeding air from a diesel fuel system:
1. Turn off fuel valve.
2. Clean outside of filter housing.
3. Install new filter element and new gaskets. A little oil on the gasket will aid a tight
seal.
4. I'd suggest that you fill a spin-on filter with clean fuel before installation.
5. Open the bleed plug on the filter closest to the fuel tank.
6. Open fuel supply valve so that the fuel is available to the filter and pump.
7. Most all equipment has a hand priming pump lever to pump fuel through the system
and replace trapped air. (Check operator's manual.) Pump several times until full
flow, without air bubbles, escapes from the bleed plug holes.
8. You may need to bleed filters, fuel pump and lines to the injectors.
9. Close bleed plugs after all air is removed from the fuel tank, filters, settlement bulb,
and fuel pump (only one at a time working through all bleed screws beginning closest
to tank and ending at nozzles if necessary).
10. Try the engine; if it doesn't start or runs poorly, you may have to bleed the injection
line.
11. Loosen injection lines at the injectors about one turn. The use of two wrenches will
prevent the binding or twisting of the steel lines. Usually, it is enough to bleed just half
of the lines at a time.
12. Crank the engine until all air is forced out and fuel is present.
13. Engine will start to pop on one or two cylinders.
14. Tighten the injector lock nut one at a time to tell by sound which cylinders are firing
properly.
15. Run the engine until it runs smoothly. This will bleed the other injectors.
