Natural Gas

natural gas generator conversion kit

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Home Up NPSK Natural Gas Pipe Chart

We have Professionally Equipped Yamaha Generators Ready to run on Propane, Natural Gas and Gasoline. Click here to learn more . . .      Want help figuring out which kit to order?  First try our "What Kit Do I Need?" page and

also the new "Simple Explanation" page!





Some Kit Order Links on individual pages are no longer functioning.  We apologize for the inconvenience during this website update.  If the ones on your page are not functioning, please verify what kit is available for your unit and then

click this link "KIT LIST PAGE FOR ALL GENERATORS AND ENGINES" to go to this temporary kit listing page.


Search for any Generator or Engine number. See results below:


Help Links


ALL ENGINES 12hp or smaller use

A & C Kits


ALL ENGINES 13hp or Larger use

Type 1 Kits

Dedicated High Pressure Propane


Type 2 Kits

Bi-Fuel Propane and Gasoline


Type 3 Kits
Dedicated Natural Gas and Low Pressure Propane

Type 4 Kits
Tri-Fuel Natural Gas, Propane, and Gasoline


Remote Start
The parts needed to start a generator remotely by wire or even wireless


What Kit do I need?

Don't know what kit is best for your application?

Click this link for a Simple Chart that should help you decide what is your best kit choice.

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Thursday August 05, 2010

News & Features

Kit Production Update:


 is currently at:

1-3 days

As always, some kits take a little longer due to heavy order volume. 

Kit Center Regular Hours of Operation:

Monday thru Friday

9:00 am - 4:30 pm

Eastern Time.


If you require assistance please fill out a request form using this link

Tech Help

 or the email address found in your Master Conversion Instruction Booklet.




Use your credit card and safely and securely  order on-line.  Or call our office toll free at :


 Monday thru Friday 9-4:30 Eastern time.  You can place your order over the phone if you feel more comfortable doing that or if you would like to speak with a company  representative to answer any further questions you may have. 

Please check our BASIC INFO page first.




For our Canada customers call us here in the U.S. toll free at




Installation Information and Pipe sizing

natgas.JPG (16304 bytes)

Typical Natural Gas & Low Pressure Propane Installation

TYPE A, TYPE C, and TYPE 3 and TYPE 4 KITS are for natural gas and low pressure propane. These kits are all the same in that they use a low inlet pressure engine regulator. The Drawing above illustrates a generator installed on the low pressure inlet side of the typical house pipe system.  The gas meter shown on the left would be a low pressure propane regulator if this was a typical two stage propane system.

As a reference, 1 pound of pressure or 1 psi can be represented in various equivalents such as:

28 inches of water column

16 ounces

2 inches of mercury

The engine regulator included in these types of kits will accept up to 14" of water column maximum (one half of one pound per square inch). This allows the engine regulator to be used for both natural gas (4"-8" wc) and low pressure propane (11"-14" wc).  The same regulator can be used for both fuels and that is why this type of engine regulator is used in the Tri-Fuel Kits. 

Due to these relatively low pressures, somewhat larger pipe sizes are required to handle the load. For instance, a 1/2" pipe coming directly from a natural gas meter could not be over 10' long and handle the volume of a 10hp generator. Right from the meter a 1/2" line can operate a 13hp engine.  So having the 1/2" pipe at the opposite end of a home will almost never be able to be used for a generator unless it is just off a large main pipe line.  Most often, the generator would have to be connected right after the meter or low pressure regulator.   The chart below is a reference guide to help determine the correct pipe size if teeing in at the outlet side of the meter.

(Note: This is a guide only and is VERY conservative. Qualified personnel should calculate exact requirements.) 

                                                Pipe size (inches) Based on Distance in feet from Meter





10 20 30 40 50 60 70 80 90 100 125
1850 3.5 .5 .5 .5 .5 .5 .5 .5 .5 .5 .5 .5
2500 5 .5 .5 .5 .5 .5 .5 .5 .75 .75 .75 .75
4000 8 .5 .5 .5 .75 .75 .75 .75 .75 .75 .75 1
5000 10 .5 .75 .75 .75 .75 .75 .75 1 1 1 1
7500 15.5 .75 .75 .75 .75 1 1 1 1 1 1 1.25
8000 16 .75 .75 1 1 1 1 1 1 1 1.25 1.25
10,000 20 .75 .75 1 1 1 1 1.25 1.25 1.25 1.25 1.25
12,000 24 .75 1 1 1 1.25 1.25 1.25 1.25 1.25 1.25 1.25


For instance, if a gas grill outlet is stubbed out the typical 1/2" pipe would need to be fairly close to the main 3/4" or 1" gas line.  This is a very common hook-up request and if the overall and the stub out pipe is sufficiently sized, removal of the 3/8" gas grill quick disconnect and shut off would be necessary and just install a 1/2" tee and then reinstall the grill outlet parts on one side and a new 1/2" quick disconnect (QDC-12) and shut off valve on the other.  If no properly sized outlet is available the generator may have to be connected right after the meter or low pressure regulator.   This is not a bad Some customers have called pluming companies and after getting their installation  cost with labor have opted to order a quick disconnect and a very long rubber hose like 75' that they can roll out and connect to the quick disconnect at the meter when the generator is needed and roll the hose back up and store when the generator need is over.  This can save the cost of a plumber or gas company installing underground piping and if moving is a possibility in the future the hose can easily be used at a new location.  We can provide our custom hoses at any length you may require and have done so to many hundreds of feet as needed.

Disclaimer: We suggest that you seek the help of your local gas company or licensed plumber. Always check local codes for final installation.

If this low pressure method of installation is what you need, the two types of kits to choose from will be the dedicated Types A, B and 3 or the multi-fueled Type C, D and 4 Kits.


The following links will take you to the correct page that describes these kits: 


Type 3 Kits are Low Pressure Propane and Natural Gas Dedicated Conversion Kits for 13hp or

larger engines.

 Price For Most Engine Brands start at



Type 4 Kits are Low Pressure Propane, Natural Gas, and Gasoline Tri-Fuel Adapter Style Kits for

13hp or larger engines.

Price For Most Engine Brands start at



Type A Kits are Low Pressure Propane and Natural Gas Dedicated

Conversion Kits for 12hp or smaller engines.

 Price For Most Engine Brands start at



Type C Kits are Low Pressure Propane, Natural Gas, and Gasoline Tri-Fuel Adapter Style

Conversion Kits for 12hp or smaller engines.

Price For Most Engine Brands start at




Click here to return to the Type A and C Kits page

Use this link to CONTACT US by filling out a request form or contact us

in the U.S. at 1-800-553-5608

or toll free from Canada to our US office 1-800-486-0077.

US Carburetion Kit Center

416 Main Street * Summersville * West Virginia * 26651

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