Keep your injectors functioning properly with common rail injector testing

05 Feb 2025

Before discussing Common rail injector testing, we will give you some insights about common rail fuel injection.

In the common rail system, fuel is distributed to the injectors via a rail which is a high-pressure accumulator. Electronics control the pressure in the rail and the start and end of the signal that turns on the injector for each cylinder. So the benefits of a common rail system are that it can perform multiple fuel injections in a single combustion cycle and at a much higher pressure. This leads to lower emissions and a better fuel economy, but this system comes with risks as it is susceptible to damage and being worn out.

Why common rail testing is Needed?

Common rail injector systems need constant maintenance and testing because they can fail sometimes, especially with all the advanced technology they use.

Below are common rail failures that must be prevented by frequent common rail test bench:

Particle Contamination

If the filtration was inefficient, even a tiny strain of human hair can cause significant damage to the system. Such failures include alterations in the fuel spray pattern, which disrupts the timing and distribution of the fuel inside the engine.

Deposit Accumulation

If there is any fuel left in the injector after the engine is turned off, it will be “cooked” by the remaining heat, which creates carbon deposits; this is also called “coking”. If you don’t remove these deposits, they will build up around the tip of the nozzle and the parts inside the injector. This will make the needle stick, which can also change both how much and when the injection is given.

How To Know if A Common Rail Injector Tester is needed?

Check Engine Light

Sometimes when there is something wrong with the engine, it gives you a sign by a lit button.

Check For Knocking Sound

Another signal that an engine might reveal to you that Common Rail injector test benches are needed is if it makes something like a knocking sound.

Watch Out For Engine Surge

In other words, engine revs will fluctuate if the injector is faulty because it might spray too much fuel into the cylinders.

Leakage of Fuel

If you observe any diesel on or near the injector, then a Diesel injector test bench is a must. After figuring out that the injector needs testing, you must utilize one common rail injector test bench in order to perform the common rail testing process.

How do you test common rail diesel injectors?

There are several ways to conduct a Diesel injector test bench, like checking the engine for light or noise or engine surge or misfire. however, for complete testing, you ought to opt for common rail injector testers.

How is Common rail injector repair done?

Common rail injector testing indicates the issue with the injector. However, common repair practices include replacing the nozzle, then disassembling the injector, and replacing the high-pressure sealing washer. Then you will need tools to repair valve sets and magnet assemblies.