Which DQTube Filter Should You Choose?

Cleaning diesel fuel is key to protecting engines. Learn how water forms in the tank, what damage it can cause, and which DQTube model is the right solution.

Why removing water and contaminants matters

Modern diesel engines operate with extremely high precision. Common rail injection systems deliver fuel to the engine at pressures of several thousand bar, so even a tiny amount of water or contamination can cause serious problems. A single grain of rust or a few millilitres of water can be enough for the high-pressure pump, the injectors or other components of the fuel system to fail prematurely.

Many people believe the factory fuel filter is enough, yet a significant share of the problems develops long before the fuel reaches the engine. Contaminants and condensation water accumulate in the fuel tank itself.

That is why cleaning diesel fuel is not merely a maintenance task, but one of the basic requirements of reliable operation.

How does water get into diesel fuel?

Many assume that water can only enter the tank with poor-quality fuel, yet in most cases a natural process is behind it.

As the tank warms up during the day and cools down at night, the humidity of the air inside condenses. This condensation water gradually collects at the bottom of the tank, because water is heavier than diesel fuel.

The larger the tank, the less often it is emptied, and the longer the fuel is stored in it, the more water can accumulate.

The problem is especially common in:

• agricultural machinery
• trucks
• boats
• generators
• construction machinery
• on-site fuel storage tanks

What can water cause in diesel fuel?

Water is undesirable in itself, but the real problem is that it provides a favourable environment for bacteria and fungi to multiply. The consequences can include:

• sludge formation
• clogged filters
• corrosion
• a rusting tank
• wear of the injection system
• engine shutdowns
• costly repairs

Repair costs for modern diesel engines can run extremely high, so prevention is always cheaper than repair.

Is the factory fuel filter enough on its own?

The primary job of factory filters is to protect the engine from any remaining contamination.

However, they were not designed to handle the water accumulating at the bottom of the tank over long months.

If the contamination can already be removed in the tank:

• the factory filters are under less load
• their service life can be longer
• the risk of fuel system failures can decrease
• cleaner fuel reaches the engine

How does DQTube help clean diesel fuel?

DQTube is a solution placed inside the fuel tank that works continuously at the bottom of the tank — exactly where water and contaminants collect.

Its tasks:

• absorbing condensation water
• removing water that enters the tank
• collecting rust and other contaminants
• reducing the risk of bacterial growth
• preserving fuel quality

Since DQTube stays in the tank permanently, it does not perform a one-off cleaning but provides constant protection.

Which DQTube model should you choose?

Choosing the right model depends primarily on the size of the tank and the required water absorption capacity.

How to choose the right DQTube model?

When selecting the right size, it is worth considering:

• the volume of the tank
• the size of the tank opening
• how long the fuel is stored
• the annual fuel consumption
• the ambient humidity

As a general rule, the larger the tank and the longer the fuel is stored in it, the higher-capacity DQTube is recommended.

Summary

Cleaning diesel fuel is no longer the job of the factory fuel filter alone. Water, rust and contaminants typically appear in the fuel tank first, so prevention starts there as well.

The DQTube Universal, PRO, MT and LT models are built on the same principle: they continuously remove water and contaminants inside the tank, helping to preserve fuel quality and protect the fuel system.

When choosing the right model, the size of the tank, the operating environment and the required water absorption capacity are the most important considerations.

Check out the available DQTube filters and pick the size that fits your tank!