Sylvie Willis
The Racor 900 series of fuel filters are used in marine applications. They are fuel/water separators, with specific models including the 900FH, 75900FHX, 900MA, 900MAM, 903MA, 75900MAX, 75900MAXM, and 900MA10. The primary filter in the fuel path catches the majority of debris, while the secondary filters on the engine do the fine filtration. The Racor priming pump is used to refill the filter.
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What You'll Learn
The Racor 900FH diesel fuel filter
The 900FH filter protects engines through a three-stage process: separation, coalescing, and filtration. During the separation stage, the turbine centrifuge uses centrifugal action to separate solids and free water from the fuel. This stage alone removes over 30% of contaminants. In the coalescing stage, smaller water droplets and solids combine on the conical baffle and fall into the collection bowl. Finally, in the filtration stage, the proprietary Aquabloc water-repelling media removes nearly 100% of water and other contaminants from the fuel. The Aquabloc media is specially treated to separate water from fuel, causing it to collect into large droplets that are extracted through the bottom of the bowl. The Aquabloc elements come in three different lengths for various flow rates and are colour-coded to indicate their micron rating. The lower the micron rating, the finer the filtration.
Changing the Racor 900FH fuel filter is a simple process. First, shut off the fuel supply to the Racor. You may need to drain some fuel from the filter to prevent spills when opening the lid. Next, unscrew the 'T' handle by hand and remove the old filter element. Then, insert the new filter element and secure the 'T' handle. Finally, reopen the fuel supply valve and top up the fuel in the Racor. It is recommended to replace the O-rings for the gauge stem and filter top, lubricating them with fuel.
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How to change the filter
To change the filter of a Racor 900 model, there are a number of steps to follow. Firstly, shut off the fuel supply to the Racor. You may need to drain some fuel from the filter to prevent spillage when removing the lid.
Now, remove the four machine screws holding the bowl onto the housing. You can then slide the aluminium clamping ring up and off the bowl, and remove the bowl. The bowl may need some force to remove. Once the bowl is off, you can access the filter.
The next step is to replace the O-rings for the gauge stem and filter top, lubricating them with some fuel. The new filter should come with replacement O-rings. Also, replace the little red O-ring if your Racor has a vacuum gauge.
After replacing the O-rings, you can insert the new filter. Remember to top up the fuel in the Racor and open the valve.
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The filter's three-stage process
The Racor 900 fuel filter is a three-stage process that efficiently removes contaminants from fuel, protecting engine components. Here is a detailed overview of the three-stage process:
Stage One: Separation
In the initial stage, the fuel enters the filter assembly and undergoes a centrifugal process. This action forces large solids and water droplets to separate from the fuel and settle at the bottom of the collection bowl. This step ensures that the majority of the contaminants are removed before the fuel moves on to the next stage.
Stage Two: Coalescing
In this stage, the focus is on addressing the remaining small water droplets in the fuel. These droplets bead up on the surface of the conical baffle and cartridge element. As they accumulate and become heavier, they also fall to the bottom of the bowl, effectively removing them from the fuel.
Stage Three: Filtration
The final stage employs proprietary Aquabloc®II cartridge elements. These elements are designed to repel water and capture any remaining contaminants down to two microns in size. This stage ensures that the fuel is thoroughly cleaned and that any remaining traces of water are eliminated. The cartridges are waterproof and provide longer-lasting effectiveness compared to water-absorbing elements.
Additionally, it is important to note that regular maintenance and filter changes are crucial for optimal performance. It is recommended to drain the fuel filter housing periodically and replace the filter element annually to maintain the efficiency of the Racor 900 fuel filter.
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The filter's compatibility with other parts
The Racor 900 fuel filter is compatible with a range of other parts and accessories, which can enhance its functionality and ease of use. Here are some details about the filter's compatibility with other parts:
The Racor 900 fuel filter is designed to work in conjunction with other components in the fuel system. It can be used as either a primary or secondary filter, depending on its placement in the fuel path. As a primary filter, it is typically installed on the engine and is responsible for catching the majority of large contaminants. As a secondary filter, it performs fine filtration to capture smaller particles and protect the engine.
The Racor 900 fuel filter is compatible with the Racor priming pump, which can be added to improve the priming process for secondary filters. The priming pump is easy to install by replacing the short bolts with longer ones, resulting in a height increase of about 3 inches. With the priming pump, users have reported a faster and more convenient priming experience, reducing the number of pumps required to prime the secondaries.
The Racor 900 fuel filter can also be used with the Racor shutdown valves, specifically part number RK19492. These valves are made of brass and are an important component in controlling the fuel flow within the system. They work in conjunction with the filters to ensure proper fuel filtration and engine protection.
Additionally, the Racor 900 fuel filter is compatible with the redesigned fuel filter water separator. This separator is manufactured using state-of-the-art equipment and is designed to fit specific Racor filter models, including the 900FH, 75900FHX, 900MA, 900MAM, 903MA, 75900MAX, and 75900MAXM filters. The water separator plays a crucial role in separating water and contaminants from the fuel, ensuring a clean and efficient fuel supply to the engine.
It's important to note that when changing the Racor 900 fuel filter, users should also replace the O-rings for both the gauge stem and the filter top. These O-rings help create a tight seal and prevent fuel leaks. Lubricating the O-rings with fuel before installation is also recommended.
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The filter's fuel flow rate
The Racor 900FH turbine fuel filter offers protection for engines with a maximum fuel flow rate of 341 litres per hour. This is suitable for marine diesel engines with a maximum power output of 400HP. The filter housings and 2040PM-OR, 2040SM-OR and 2040TM-OR elements are available for online purchase.
The Racor Turbine Series is suitable for a wide range of maximum fuel flow rates, including from 227 litres per hour (50 gallons per hour) with a single Racor 500FG, and up to 2044 litres per hour (450 gallons per hour) with the 77 and 791000 series triple-manifold units. Applications for the Racor Turbine Series include containerised generator sets, excavators and transporters.
The Racor 900 Series Diesel Fuel Filter is also suitable for marine diesel engines with a maximum power output of 100Hp. This filter has a maximum flow rate of 114 litres per hour (30 gallons per hour) and a maximum pressure of 30 PSI.
The Racor 900 Series is also suitable for marine diesel engines with a maximum power output of 1200HP. This application has a maximum flow rate of 1363 litres per hour (360 gallons per hour) and a maximum pressure of 15 PSI.
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