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Civic CNG Tank specs listed by year - and answer to question "can tank from new model go into old model"

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  • Civic CNG Tank specs listed by year - and answer to question "can tank from new model go into old model"

    All information below is from Honda civic owner manuals, service manuals, conversations with tank manufacturers, and press releases (I include sources as needed).

    Honda Civic GX: 1998 to 2003
    Manufacturer: Lincoln Composites
    Tank Type: 4
    Model Number: RC36A18-037PQ
    Capacity at 3000 PSI: 7.2 GGE
    Capacity at 3600 PSI: 8.0 GGE
    Capacity by Water Volume (100 Liters, or 26.4 US Gallons)
    Tank Dimensions (OD X Length): 18 inches by 37 inches

    Tank size is denoted in Model Number, and can be found in this press release from 1998: http://www.theautochannel.com/news/p...ess011981.html

    11/2/2015 UPDATE: I talked to someone at Hexagon Lincoln. Here are exact, unadvertised specifications in Lincoln Type 4 Tank (these numbers differ from what is printed in Honda Manuals)
    Capacity at 3600 PSI: 8.2 GGE
    Capacity by Water Volume (96.5 Liters)
    Tank Dimensions: 18.2 inches by 36.5 inches



    Honda Civic GX: 2004-2015
    Manufacturer: Structural Composite Industries (Now known as Worthington Industries)
    Tank Type: 3
    Part Number: 127335
    Capacity at 3000 PSI: 7.2 GGE
    Capacity at 3600 PSI: 8.0 GGE
    Capacity by Water Volume (100 Liters, or 26.4 US Gallons)
    Tank Dimensions (OD X Length): 18.3 inches by 35.2 inches

    Tank size can be found in press release: http://www.fleetsandfuels.com/fuels/...y-and-propane/

    Difference in Factory Tank Diameters
    0.1 inches = (SCI Tank Width - Lincoln Composite Tank Width) = (18.3 inches - 18.2 inches)

    Other Questions:
    Q: I own a civic in the 1998-2003 era. When I google for tank capacity it says 7.2??
    A: This is because some press releases and other tech bits google references are only mentioning the capacity at 3000 psi for these years

    Q: Can an SCI tank from 2004+ model go into a 2003 model or below (those equipped with Lincoln Composite Tanks)?
    A: Yes. I myself have an SCI tank from 2004+ model in my 2000 Civic

    Q: I'm curious what does the installation procedure looks like:
    A: http://cheespa.orcas.net/Honda%20Civ...01998-1999.pdf (Section 11-138, or page 289)

    Please let me know if any corrections are needed
    Last edited by enigma3319; 12-06-2015, 11:43 PM.

  • #2
    Wow, great research and a very useful thread to stick at the top of the Honda forum.

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    • #3
      Will a Lincoln Composites tank model RH36B18-03635 fit in place of the original RC36A18-037PQ in a first generation GX? What do the letters in the model number designate? I think that the numbers "36" & "18" in the first part of the model number designates the length & width, therefore these tanks would be the same physical size, but the biggest problem in question is the thread size. I think the original GX tank valve is 2" diameter thread size.

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