4D31 4D32 Used Fuel Injection Pump For Excavator HD512 101492 -
1221
Specification
| Car name: Fuel Injection Pump | Model Number: 4D31 |
| Quality: Standard | Engine type: Diesel |
| Application: Excavator | Part code: 101049 - 9950 |
| Cooling: Water cooling | Injection: Direct |
Description
How does a Continuous fuel injection pump work?
The continuous pump helps to maintain pressure on the fuel lines.
Unlike other pumps, it is not used to distribute or meter the
quantity of the fuel.
It is used in an electronic fuel injection system, where the ECU
controls the fuel injection.
How to tell if fuel injection pump is bad?
Some of the faulty fuel injection pump symptoms are as follows:
1. Engine splutters: The improper fuel injection because of the faulty fuel injection
pump is one of the reasons for the sputtering noise of the engine.
One can notice this sputtering noise while accelerating the vehicle
or at a higher engine speed.
2. Whining noise: This is another symptom that you can hear a whining noise made by
the fuel pump at the location of the fuel tank.
It may arise due to the faulty fuel injection pump or it may cause
due to the insufficient amount of fuel in the tank, thus it becomes
difficult for the pump to suck the fuel.
3. Lack of power when a vehicle is loaded: In some cases when the vehicle is in loaded condition, the fuel
pump is not able to provide a sufficient amount of the fuel for the
combustion, thus it feels like the engine is unable to produce a
sufficient amount of power to move the load.
4. Difficult to start: Sometimes it becomes difficult to start the engine, as the fuel
pump is not pressurising the fuel line. In some cases, the engine
gets started, and then it again stalls.
5. Smoky exhaust and less fuel economy: One of the reasons behind the smoky exhaust is that the fuel pump
is supplying excessive fuel to the injectors. Thus due to the
improper combustion of the fuel, smoky exhaust gases are observed
at the tailpipe or the fuel economy gets lowered.
What is phasing and calibration of fuel injection pump?
Phasing of the fuel injection pump is the procedure of adjusting
the fuel injection timing to reduce the torque fluctuations. The
phasing of the fuel injection pump is generally done before the
calibration.
The timing of the fuel injection is adjusted with respect to the
position of the crankshaft. The phasing helps to reduce the torque
fluctuation, thus it also reduces the gear impact noise.
Calibration of the fuel injection pump is carried out to ensure the
same quantity of fuel is delivered to all the cylinders of the
multicylinder engine. The calibration is generally done after the
repairing or rebuilding of the fuel injection pump.
