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  • Size of Crown Vic CNG Tanks

    I just bought two used tanks off a Crown Vic (bracketed together 14x38 ) and was wondering the total GGE of both of the tanks?

    Thanks

  • #2
    Re: Size of Crown Vic CNG Tanks

    That's a great question, I am in the process of trading for a bi-fuel Crown Vic--I would love to know the average gge capacity and mileage per tank on one of these, and mpg if available.

    Any ideas, fellas?
    --------------------------------
    1999 Ford Crown Victoria
    Dedicated CNG Interceptor

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    • #3
      Re: Size of Crown Vic CNG Tanks

      About 10 GGE total

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      • #4
        Re: Size of Crown Vic CNG Tanks

        My 99 CVPI has 4 tanks, Steel with Fiberglass wrap, Type 2; 2 in the trunk (on the spare tire shelf) and 2 under the car where the gasoline tank would be.
        They are 2.2 GGE each for a total of 8.8 @ 3000PSI, (about 9.9 @3600 PSI, if I were a 3600 vehicle)

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        • #5
          Re: Size of Crown Vic CNG Tanks

          The 14's that sit verticle in the car are 3 gge each and the 12's that sit on the spare tire shelf are 2.5 gge each. That's where the 11 gge comes from
          sigpichttp://WWW.CNGMOTORS.COM
          SAVE TIME. SAVE MONEY. SAVE THE ENVIRONMENT.

          2003 Hummer H2 bi-fuel
          2000 GMC Yukon XL bi-fuel
          1999 International 4700 dual-fuel
          2007 Chevy Avalanche bi-fuel

          FMQ2-36 Fuelmaker w/ 24 GGE cascade

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          • #6
            Re: Size of Crown Vic CNG Tanks

            I have a 2003 Crown Vic CNG with 3 tanks, 3600PSI. The most I've ever put in is 8.6GGE and I was on E. Does this mean I have 9GGE capacity most likely

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            • #7
              Re: Size of Crown Vic CNG Tanks

              If it is a factory Crown Vic and only has 3 tanks then it is nearly guaranteed that someone removed one. As far as I know every factory Crown Vic had the standard 4 tank setup mentioned by CNGUTAH above. with 2 on the trunk shelf and 2 in place of where the gasoline tank would normally have been. Your CNG fill at any given moment is based on several factors: ambient air temperature ; quantity of fuel already in tanks, functionality of fill station. Fillling from E or low fuel light pretty much guarantees that you will come up short of full since the fast fill activity causes heating and expansion during the process. You can often wind up somewhere between 10 or 20 percent below capacity and can count on seeing the fuel guage fall rapidly at first as you drive away from the station since the tank and fuel temperature start dropping immediately after the filling stops. Whenever you want a complete fill from the average public station you are forced to get it from nearly full and I recommend early morning top-off. I can pretty much guarantee that if you had gone back to a station after your 8.6 fill from empty with sufficient time ( like overnight) for cooling then you would have gotten an addition 2 or 3 GGE to get as near capacity as standard fast-fill will manage. BTW, are you seeing 3 tanks in the trunk section? If so, and the vehicle is actually CNG dedicated from factory then you likely have 5 tanks with an extended setup of 3 X 3.5 GGE in the trunk section alone and should be able to get around 14 GGE fill. In the event that you are NEVER getting more than about 9 GGE into this setup then you may have a bad tank valve somewhere in the mix.

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              • #8
                Re: Size of Crown Vic CNG Tanks

                A point of interest... I measured the trunk in my 2002 Lincoln Town Car (mostly the same body as the Crown Vic). It looks like the OEM (~12gge) tank from an F150 will fit without a lot of modification- it might be preferable to lower the stock f150's mount a little to provide a little more space for removal of the TC spare tire.

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                • #9
                  Re: Size of Crown Vic CNG Tanks

                  It is a factory CNG Crown Vic and we bought it straight from a police auction (so I don't think someone removed a tank). Could be a bad valve, I'll have it checked out. Any suggestions for a really great CNG guy in Phoenix AZ?

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                  • #10
                    Re: Size of Crown Vic CNG Tanks

                    Originally posted by georgekessel View Post
                    ...Any suggestions for a really great CNG guy in Phoenix AZ?
                    I've had Murphy at CNG Motors do tank work (added a tank in the 2000 Tahoe where there was only 4 GGE originally in the spare tire spot; added a pair of CV tanks to the trunk in the 2008 Civic GX) Good luck!
                    2008 GX (extended range, trunkless version)
                    Polished Metal Metallic 2012 Civic Natural Gas
                    Fuelmaker FMQ-2-36 (since 2001)
                    Previously owned: 2000 GX (11 years), 1995 Bi-fuel Sonoma, 2000 Bifuel Tahoe, 2000 Bi-fuel F150

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                    • #11
                      Re: Size of Crown Vic CNG Tanks

                      What is your range on your 2008GX now ? I also have a 2008 GX with only factory tank.

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                      • #12
                        Re: Size of Crown Vic CNG Tanks

                        Originally posted by georgekessel View Post
                        What is your range on your 2008GX now ? I also have a 2008 GX with only factory tank.
                        At least 350 and likely quite a bit more... I've only done one real long range check so far: 319 miles with 5 bars remaining last weekend coming back from Vegas; and that was not trying to conserve fuel, we went with the flow of traffic 75+ mph a lot of the way... I'm hoping for 400+ (to get me to and from Yuma where my Dad spends the winters)
                        2008 GX (extended range, trunkless version)
                        Polished Metal Metallic 2012 Civic Natural Gas
                        Fuelmaker FMQ-2-36 (since 2001)
                        Previously owned: 2000 GX (11 years), 1995 Bi-fuel Sonoma, 2000 Bifuel Tahoe, 2000 Bi-fuel F150

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                        • #13
                          Re: Size of Crown Vic CNG Tanks

                          https://www.fleet.ford.com/downloads...ice_screen.pdf

                          This document contains the OEM FORD FACTORY CNG gge capacities for the OEM (factory 2004) 3600 PSI setup.
                          I concluded the following info from a glance at the attached pdf specifications:

                          Each under chassis tank is 2.25 gge @ 3600 PSI or 4.50 gge for the pair.
                          Each in-trunk tank is 3.70 gge @ 3600 PSI or 7.40 gge for the pair.

                          Thus the STANDARD RANGE factory 2004 (3600 PSI) configuration yields 11.90 gge.

                          The EXTENDED RANGE factory option for 2004 included an elevated SINGLE 3.70 gge (3600) tank. This EXTRENDED RANGE (five-tank) setup yields 15.6 gge.
                          The five tank setup was designed to allow more useable cargo space.

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                          • #14
                            Re: Size of Crown Vic CNG Tanks

                            Originally posted by cast_n_blast View Post
                            I just bought two used tanks off a Crown Vic (bracketed together 14x38 ) and was wondering the total GGE of both of the tanks?

                            Thanks
                            http://documents.rasoenterprises.com...4-08%20(2).pdf

                            Comment


                            • #15
                              Re: Size of Crown Vic CNG Tanks

                              Originally posted by Mshepcomm View Post
                              My 99 CVPI has 4 tanks, Steel with Fiberglass wrap, Type 2; 2 in the trunk (on the spare tire shelf) and 2 under the car where the gasoline tank would be.
                              They are 2.2 GGE each for a total of 8.8 @ 3000PSI, (about 9.9 @3600 PSI, if I were a 3600 vehicle)
                              Thanks for taking the time to discuss this, I feel strongly about it and love learning more on this topic. If possible, as you gain expertise, would you mind updating your blog with more information? It is extremely helpful for me.

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