Separ Filter FAQ


How do I clean the clear bowl?

NEVER clean the clear bowl with Windex or any type of cleaner with chemicals. The bowl will spider crack once you add the diesel fuel back in. You can only use non-chemical products (i.e., Simply Green, et al.) or we also suggest cleaning it with diesel fuel.

How do I put on the handle for a duplex filter?

To put the handle on the first time, make sure the bar is in the neutral position. The valve handle must be parallel to the filters when installed.

How much torque do I use when tightening filter screws?

Click Here to view the table that specifies the recommended torque values for the filter assembly.

What is the correct way to tighten a Separ Filter lid?

Click Here to ensure to tighten screws evenly in the sequence shown.

Click Here a Separ Filter lid, when tightened, will appear to have a space. DO NOT over-tighten, as this will crack the lid.

What is the correct way to tighten the bowl screws?

Click Here to ensure to tighten screws evenly in the sequence shown.

What is the water holding capacity of the Separ Filter?

Click Here for the table that specifies the water holding capacity up to the contacts of the filter bowl.

What’s the difference between single water contacts and double water contacts?

Click Here – If you only have a single filter, then you need to buy the Single Water Contacts.

Click Here – If you have a duplex filter, then one filter uses a set of Single Water Contacts and the second filter uses a set of Double Water Contacts.

Which element do I need?

On the front of the filter housing is a white and blue label. This shows model number and part number for the replacement element. If the label is not visible or your filter does not have one, you can Click Here to download the Replacement Element Guide to find out which one you need.

Why did the yellow tab break off?

Make sure to push the drain valve down and turn to the left. Otherwise, you will break off the yellow tab when tightening.

Why is it important to filter fuel?

The majority of fuels contain sediment and water which is harmful to the engine. Sediment clogs the injectors and fuel lines while also wearing out components through abrasion, rendering them inefficient prematurely. Water causes acid which in turn causes pitting and shortens the lifespan of components. With changes in temperature both seasonal and daily, condensation builds up in the fuel tank and that water has to go somewhere. Usually into the engine because most filters on the market today are not capable of eliminating all the water in fuel.  The Separ filter completely eliminates all water and sediment.

Why is the Separ filter better than other fuel filters on the market?

Water and solid contaminants displace the fuel’s lubricative properties in the high precision injection components. The loss of this protection results in wear, erosion, surface pitting and eventual pressure loss.

Many existing fuel filters aren’t designed to remove significant amounts of water. They are designed to do their job in a single step. The Separ filter offers a compact design, high efficiency, low flow restriction, a long life filter element, easy installation, and simple maintenance.

Main Features:

  • Available with various flow rates from 1 to 260 I/min. Thereby offering fuel filters for an engine performance range of 5 to 10,000 kw.
  • Compact size, various ports, simple installation.
  • Manufactured from high quality non-corroding aluminum alloy casting, heavy polycarbonate or metal bowls and stainless steel hardware
  • High separation efficiency of water which is contained in the fuel.
  • Extended service time of the filter elements.
  • Protects the injection pump and injection nozzles.
  • Easy maintenance

How often should the cartridges be replaced in the filter?

Backflushing is required when dirt and water block the filter element. The following signs will indicate this procedure is necessary:

  • Loss of engine power
  • Black smoke may exhaust from the engine
  • Vacuum gauge will indicate a high restriction reading on the element of the filter.


  • Stop the engine or switch over to the spare filter on the switchable units
  • Open the bleed screw
  • This introduces atmospheric pressure into the filter
  • The dirt particles and larger droplets of water will release from the bottom of the filter element
  • Gravity will assist the dirt particles as they slowly fall to the bottom of the bowl
  • Open the drain valve (PUSH IN AND TURN)
  • The clean fuel above the filter will backflush through the filter element. This will release the smaller dirt and water particles.
  • Drain the fuel until the dirt and water are removed from the filter and the bowl. Close the drain valve.
  • Close the bleed screw (DO NOT OVER TIGHTEN)

You may now start your engine or switch back to the clean filter. If the engine still lacks power, try backflushing the filter again. If restriction is still too high, change the filter element.

How does the Separ Filter work?

How the SEPAR 2000 Operates:


Fuel is sucked into the filter by the action of the lift pump via either port A or B. Plug off the port that is not being used. The filter is designed for the suction side of the engine.


Fuel enters through port A or B where it will then enter the centrifuge, separating larger particles of dirt and droplets of water down to 30 microns. The centrifuge does not spin. The first vane system spins the diesel fuel in a circular motion as it passes through the channels of the centrifuge.


As the fuel comes out of the centrifuge it will then hit the side of the bowl and the fuel continues to spin allowing the heavier particulates and water to separate from the fuel and settle to the bottom of the bowl.


The fuel flows through the second vane centrifuge stage forcing the fuel to spin in a different direction and passes on the outside of the centrifuge. At this point the small droplets of water and dirt particles are thrown to the center of the bowl, moving around and forming larger droplets of water. There the larger vane will catch the particles and bring them down through the vane. This is produced by the vacuum on the lowest part of the second vane.


With the continuous circular motion of the fuel, the dirt and water droplets continue to grow together; becoming heavier and falling back into the bowl again.


Specially treated water resistant paper element will filter out all remaining finer dirt and water. The element slows down fuel to allow more contaminants to settle into the bowl.

Is it easy to fit the Separ filter?

Yes, in some instances the equipments existing filter’s connections can fit right into the Separ filter. If not then obtain the coupling’s necessary to make a secure fit between the old filter and the Separ.

Is there different cartridges for use in the Separ filter?

Yes, you can choose between 10 micron and 30 micron filters depending on how contaminated the operating conditions are. Usually in high contamination conditions the 30 micron filter will work best as it can be back flushed daily if necessary and the machine continues to operate. If the 10 micron cartridge is used in high contamination conditions it may have to be cleaned more often or replaced. The 10 micron filter is ideal for normal operating conditions.

How often should the cartridge be inspected for contamination?

In clean operating conditions a physical inspection every 8 weeks. In very dirty conditions especially dirty fuel conditions every 2-4 weeks.