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Details about  Coalescent CNG Fuel Filter for Natural Gas Vehicles NGV

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Coalescent CNG Fuel Filter for Natural Gas Vehicles NGV
Item Sold
Item condition:
Jun 01, 2012
US $34.95
$1.75 Standard Shipping | See details
Item location:
Tooele, Utah, United States

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Last updated on  Aug 22, 2011 15:21:39 PDT  View all revisions

Item specifics

Condition: New Part Brand: Finite
Warranty: Yes Manufacturer Part Number:


Filter Housing Part Number: FFC-112 Interchange Part Number: FG1088
Ford Filter Housing Number: FG-976 Other Part Number: 4W739176AA

FOR SALE – NEW OEM Coalescent Filter, Coalescing Filter, Coalescer, CNG Fuel Filter, NGV Fuel Filter, Natural Gas Fuel Filter for Dedicated Vehicles.


·         Detailed changing instructions

·         1 year 15K mile warranty

·         1) OEM Grade 6 CLS112-6 Coalescent Filter

·         1) Filter housing o-ring

·         1) Buna-N drain plug and o-ring

·         4) Buna-N drain plug o-rings

If you can change your vehicles oil, you can change your vehicles coalescent filter.  No special tools, all you need is a medium sized Crescent Wrench and a set of hex key wrenches


These are the filters made by the Finite division of Parker Hannifin.  This is the identical OEM filter sold at Chevy, Ford, Honda and Toyota dealerships.  Ford typically charges $48.00 or more for this same filter without the warranty, changing instructions, or extra drain plug o-rings.  The o-rings are made from Buna-N and are the correct durometer (hardness) for CNG applications.  I am an authorized Parker Hannifin distributor.  I offer discount dealer pricing for box quantities of 10 filters or more.  Email me for details.




·         Dedicated Natural Gas Filters Part# CLS112-6 (Black Rubber End & Plastic Tip)

·         1996 - 2004 Dedicated Ford Crown Victoria's

·         1996 - 2004 Dedicated Ford F-150, F-250, and all F-Series trucks

·         1998 - 2004 Dedicated Ford E-150, E-250, E-350, E-550 Econoline Vans

·         1996 - 2010 Dedicated Honda Civic GX. This is rear high pressure coalescent filter

·         2000 - 2002 Dedicated Toyota Camry

·         2003 - 2005 Bi-Fuel Chevy Cavalier

The recommended filter change interval is every15K miles, or whenever the filter becomes clogged or contaminated.  Even if the filter looks clean, there are still particles trapped in the element that reduces the CFM pass through.

There are two versions of this filter, the CLS112-6 and the CLS112-10. The CLS112-6 has a coalescing efficiency of 99.97%. Grade 6 filter elements are used when “total removal of liquid aerosols and suspended fines” is required. This is the filter that is recommended by Parker Hannifin for natural gas vehicle applications.  The CLS112-10 only has a coalescing efficiency of 95%, which allows more carry over oil and contaminates to pass through.  This significantly contributes to the drivability issues listed below that are common to dedicated natural gas vehicles.  You want a filter that removes as much oil as possible because the only way to remove solidified oil build up is to perform a fuel line flush.  Most dealers sell the grade 10 CLS112-10 filters because either they don't know the difference, or they know the difference and are making more money at your expense.

I warranty this filter for one year or 15K miles.  This way you’re covered until your next filter change. If the filter splits, breaks, or fails I will replace the filter free of charge.


Coalescing filter elements are specially designed to remove liquid contaminants from gaseous flows.  Coalesced liquid (water and oil) collects in the bowl awaiting drainage, while clean air or gas exits the housing through the outlet port.  Particulate contaminants are captured and held in the media.  (See filter housing diagram)


Natural gas is gathered from a pipeline and travels to a connecting compressor station.  The gas is elevated to pressures ranging from 2000 PSIG up to 5000 PSIG and the resultant CNG is stored in large tanks. The CNG then makes its way to a gas dispenser where it is ready for use in natural gas vehicles.  Contaminants can enter into the gas at any stage of this processing. Filters are critical to ensure clean gas as a final product.  Contamination that collects during handling, water that condenses in tanks and compressors that leak oil into the fuel stream are all sources of contamination that will shorten the life of expensive equipment, create unnecessary downtime and increase maintenance costs.


The most common drivability problems I see again and again in natural gas vehicles results from failing to maintain the vehicles coalescent filter.  Oil levels in excess of 10 to 80 PPM, parts per million is considered excessive carryover oil.  Excessive oil fills the vehicles fuel tanks, reducing the fuel carrying capacity. Oil builds up in the coalescent filter housing, where if not drained regularly, is drawn through the filter into the regulator and into compuvalve (if it’s a Ford bi-fuel) and then into the injectors. The higher temperatures generated by the engine cause the carry over oil to varnish and or solidify. This solidified oil is what plugs up the compuvalve, fuel injectors, pressure sensors, and eventually the catalytic converter. This is a problem unique to CNG vehicles because unlike unleaded gasoline, CNG does not contain detergents.


The coalescent filter protects your investment and prevents the following problems that are most commonly caused by excessive carry over oil.

·         Rough Idle, Dying

·         Hesitation

·         Hard Start

·         Plugged Catalytic Converter

·         Loss of Power at Heavy Load

·         DTC Codes For Lean Fuel

·         No Start

Most dealers recommend changing the filter every 15K miles under normal operating conditions and every 5K – 10K miles under sever operating conditions


The quality and cleanliness of the CNG at your local refueling station determines whether your vehicle is operating under “normal” or “severe” conditions. Testing the cleanliness of CNG before refueling is unrealistic. There is no way to know if your fuel stations compressors are operating correctly. The best way to prolong the life of your filter and protect your vehicles CNG system from excessive carryover oil is to adopt a coalescent filter inspection and maintenance schedule.


Some evidence of excessive oil after fueling includes visible oil on the vehicles male fill nozzle. Oil foaming out of the fill hole of the vehicles male fill nozzle.  If you see evidence of excessive carry over oil, or if there is more than a teaspoon of oil in your lower filter housing, you should depressurize the CNG fuel system and remove the drain plug to check for oil every 2500 to 5000 miles.   I include the extra drain plug o-rings so that the drain plug can be removed multiple times to drain excess oil between filter changes.

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