How Often Should You Drain Fuel Water Separator- Is This Important?

Occasionally, diesel fuel is easily absorbed by water, causing significant difficulties. Another issue that frequently arises is that diesel fuel becomes polluted. On the other hand, a water separator can be of great assistance in this circumstance.

The fundamental function of this device is to remove any unnecessary water from the gasoline. Usually, it is placed just next to the fuel filter, or in some instances, it is placed directly on top of the fuel filter. People are also enthusiastic about having one because it is not prohibitively pricey.

The complete subject of how to drain fuel water separator Cummins will be brought to your attention today, and we will do so in a straightforward manner. Maintain your interest in the text.

Steps on how a fuel water separator is drained

We will divide the entire process into multiple sections to make it more understandable to the general public. This method will assist in ensuring that no crucial points are overlooked at any time.

Steps on draining a fuel water separator


Essential products

  • Install the fuel separator
  • To help carry out other operations

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  • Put a bucket inside the separator
  • To use when draining the water


  • Open valve
  • To drain the water

Silicone lubrication

Step 1; install your fuel water separator on the engine

install fuel water separator on the engine

The installation of a water separator is required for the other operations to be carried out. This step is for people who did not have a fuel water separator installed in their car before starting the engine. Set the fuel water separator as soon as possible to remove the water from the fuel. To begin, you’ll want to open the hoods of the vehicle and then insert the fuel water filter into the fuel liner of your truck.

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Make sure the entire mounting bolts are correctly attached to the gasoline hose. If you do not want to use your hand, use a screwdriver or a wrench to tighten the bolt while maintaining a comfortable fit.

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Then you’ll want to connect the gasoline water separator to the wiring harness for the pressure sensor, which will be located in the bottom area of the engine. When mounting the fuel water separator, check to see no leaks or that no fuel is pouring from the fuel line.

Adding additional silicone lubrication to the installation process can help it glide down more smoothly and facilitate the installation process. After you have installed the fuel water separator, you should test it to see if it is functional or not. As a result, make sure to have enough driving time to get to the next step in the procedure.

Step 2; put a bucket inside your fuel separator

put a bucket inside your fuel separator

If you want to learn how to drain a fuel water separator, the first step you need to do is get a bucket and start preparing. The water you wish to remove from the fuel water separator might damage the other components if it is not removed using a bucket.

For the most part, the water causes rust and corrosion to the iron elements of the automobiles, which causes the injector to wear out quickly and reduces the vehicle’s overall endurance.

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Moreover, to avoid such heinous consequences, you should bring a bucket that can be slipped under the fuel water separator and used to drain the water conveniently.

Step 3; open the valve to drain the water

open the valve to drain the water

The next step is to open the valve to allow the water to drain from the fuel water separator. Make sure you have gloves on before you begin to avoid getting any mess on your hands.

When you open the fuel water separator valve, you will notice that the dirty water flows down to the bucket and quickly fills it up with water. Your vehicle will perform better and continue to function correctly for many years due to this item being installed.

Drive safely also increases the long-term value of your car. Move on to the next step, following the completion of the valve opening.

Step 4; start your vehicle for some time

Afterward, you’ll want to start the engine for 10 seconds, allowing the water to feel pressurized and drain from the gasoline thoroughly.

After starting the engine, you will notice that the water in the fuel water separator is slowly draining away. Simply wait until there is no more water on it before proceeding. If you observe that the water has been completely drained, you should proceed to the next step.

Step 5; close the water separator’s valve

When you have verified that all of the water has been drained from the fuel water separator, it is time to close the valve. You see, this device will allow you to quickly and simply remove the buckle without depleting the petrol in your vehicle.

To close the valve, ensure you have gloves on and simply twist the collar to the closed position. Make sure to wipe the mouth of the collar with a clean cloth to ensure that no water is left behind to damage the surface. Following that, go on to the following stage as fast as possible.

Step 6; put down the vehicle’s hood

Afterward, you should lower the vehicle’s hood and, if you prefer, start riding to see if there is a noticeable difference. Once a week, try to complete the entire process.

You’ll progressively discover how much water fills the reservoir under everyday riding situations due to this practice. If you notice that your vehicle’s fuel contains a significant amount of water, it is recommended that you empty it daily.

How water affects the engine

How water affects the engine

Simply said, a dirty and soggy gasoline filter will have a negative impact on the performance of your engine. The buildup of water in the fuel filter prevents the filter from effectively separating the harmful particles in your gasoline. These particles will accumulate in the fuel system and engine, causing harm to the components in those systems and machines.

The most effective strategy to resolve this problem is to ensure that this component is replaced when needed. If you neglect to do regular maintenance on this item, you may cause significant further damage to the entire fuel line.

If water accumulates in the water separator and is not removed, the housing will corrode and fail. As a result of this corrosion, it will spread to other sections of your fuel system, including your engine. An easy solution is to drain the fuel when the “Water in Fuel” light flashes and replace the secondary fuel filter regularly. By changing the secondary fuel filter regularly, you can prevent damage to the housing.

A full water separation indicates that water is now pouring into the fuel system from the water separator. Corrosion occurs throughout the system, including the internal transfer pump, resulting from this water. After that, this pump will rust and will no longer be covered by the manufacturer’s warranty.

A rusted transfer pump will not run as efficiently as it should to maintain your gasoline system operating at full performance. Long-term, this will result in a catastrophic engine failure and a slew of expensive repairs.

Preventative measures

If water accumulates in the fuel system for an extended period, it will cause significant harm. If you want to avoid this from happening, you can do two things: The first step is to react as promptly as possible whenever the “Water in Fuel” alert light or message appears. To begin, make sure that you adhere to the engine’s recommended maintenance schedule. However, ensure that the replacement parts are of high quality; a poorly constructed replacement filter might harm the environment more than reasonably. As a result, it is suggested that you utilize OEM parts if possible.

Conditions of regular operation

The most on-highway activity occurs in “general” vehicles, which are used to haul moderate loads in moderate temperatures. Choose the Special Operating Conditions schedule if you doubt, and you won’t go wrong.

Operational Conditions That Must Be Met

Drivers who put many miles on their trucks will benefit from this option. Extended idling, towing, and dusty circumstances on gravel roads or off-road all qualify a vehicle for inclusion in this list.

Stay away from the law. The recommended maintenance schedule for your engine can help you avoid long-term water damage and expensive repair expenditures in the future. Don’t get caught in the fuel system; replace your filters as soon as the manufacturer recommends.


It is not difficult to figure out how to drain a fuel water separator; however, it requires your full attention to complete the task. You can’t let anything slip your mind at this point, or else a disaster could derail the entire process. Before attempting the procedure, make sure you are entirely familiar with it.

The ability to be patient and to devote sufficient time to this process are also essential components. As a result, you will see more results and experience fewer risks associated with the situation.

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