How To Repair Fuel Injection Pump?

The quality and efficiency of fuel injection are directly impacted by the fuel injection pump's condition. However, with time, the fuel injection pump will unavoidably experience a variety of issues, from wear to failure, which might result in a decrease in engine performance or even a shutdown. As a result, timely troubleshooting and routine maintenance of the fuel injection pump are crucial. To assist customers in ensuring the seamless running of diesel engines, MyMROmarts will go over frequent issues with fuel injection pumps and their test methods in this post.

 

Fuel Injection Pump Problems

1. Wear Of Moving Parts Of Diesel Fuel Injection Pump

The most common cause is wear and tear on moving parts. Since the plunger in the fuel injection pump has been in a precision sealing state for a long time, it is prone to wear problems. Dirt and other problems can also cause wear of the plunger coupling, resulting in insufficient injection pressure, reduced fuel supply, and other problems, affecting the quality of fuel injection atomization and the combustion quality of the diesel engine.

 

2. Cam Gear Is Worn

The cam gear is also prone to serious wear after long-term operation, resulting in inaccurate oil supply timing.

 

3. Unreasonable Disassembly Of The Fuel Injection Pump

Damage to the fuel injection pump might also result from improper disassembly of the pump during maintenance or repair. For instance, an unqualified vertical connection between the plunger sleeve and the pump body may result in blockage or damage to the plunger sleeve during operation. Stasis resulting from improperly built governor rods can harm the fuel injection pump in addition to impairing the function of the plunger adjustment arm that controls oil volume.

 

4. The Spring In The Fuel Injection Pump Is Damaged

The spring part in the fuel injection pump is also one of the wearing parts. During long-term repeated stretching, the spring elasticity of the oil outlet valve will decrease or break, and the plunger spring will break, which will affect the actual working quality of the fuel injection pump.

 

5. The Fuel Filter Is Clogged

A clogged fuel filter blocks the flow of fuel. The fuel injection pump fails to provide sufficient fuel injection, which can cause the engine to stall.

 

How To Test Fuel Injection Pump?

Do you know how to test a diesel injection pump? You can easily check the status of your diesel engine injection pump by bleeding the fuel system. Let's look at how to test a diesel fuel injection pump by bleeding the fuel system.

 

1. Remove The Fuel Injector

First, you remove the injector from the engine. Then, connect the steel fuel line to the injector. When connecting steel fuel lines, be sure to point the injector away from the engine of heavy equipment.

 

2. Bleed The Fuel System

You need to bleed the fuel system. To do this, first, fill the tank with fuel. This will help increase pressure in the fuel system and clean the air faster. Locate the bleeder screw located at the very top of the fuel filter valve. You then need to open the top left screw a few turns and wait for the fuel to finish flowing out. When no more bubbles come out, you can retighten the screws. After that, do the same with the screw on the right side. After the operation is completed, it means that the fuel filter has been filled with fuel. The purpose of filling the tank is to have enough pressure to force fuel through the fuel filter.

 

Next, you need to follow the fuel hose to where the fuel injection pump is located. You will find a small bleeder screw on the fuel injection pump. Loosen the bleeder screw and wait until bubbles no longer appear. Finally, tighten the screws and you will now have fuel delivered directly to the injectors.

 

3. Turn Over The Engine

With the injector facing away from the engine, turn the engine over and let the fuel spray from the injector onto the cardboard.

 

4. Check The Spray Pattern On The Cardboard

Finally, observe the fuel injection pattern on the cardboard. If the injection pattern on the cardboard has a good circular mist shape, it indicates that the diesel injection pump is good. However, if the injection pattern is irregular or fuel is found to be sprayed out, it indicates that there is a problem with the injection pump and a new injector needs to be replaced.

 

Fuel Injection Pump Repair

1. Buy Clean, Reliable Fuel

The secret to fuel injection pump maintenance is to take preventative action to guarantee the fuel injection pump's long-term functionality. To keep fuel contaminants from blocking the fuel injection system, it is crucial to use clean, dependable fuel.

 

2. Replace Fuel Filter Regularly

Regular replacement of the fuel filter is essential, and MyMROmarts recommends that users replace it every 40,000 miles to ensure the purity and smooth flow of fuel.

 

3. Maintain The Amount Of Fuel In The Tank

Maintain a minimum of 25% of the fuel tank at all times. Doing this lowers the chance of air and other contaminants being drawn into the fuel pump and helps keep it lubricated. Users may get superior fuel injection pump performance and reduce repair expenses by adhering to these easy maintenance procedures.