Single hose fuel connector for OMC – oring replace?

Home Forum Ask A Member Single hose fuel connector for OMC – oring replace?

This topic contains 19 replies, has 8 voices, and was last updated by Avatar amuller 1 month, 1 week ago.

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  • olcah
    olcah
    US Member - 1 Year
    Replies: 325
    Topics: 69
    #11355

    I have a plastic single hose connector. It has no identification but does say made in U.S.A. The oring inside the connector is out of place. Is it possible to remove the oring and replace with a new one? Same procedure as for the OMC metal connectors for double lines? What size is the oring? Or should I just replace the conector as it is only plastic?
    Thank you,

    Avatar
    crosbyman
    Canada Member - 1 Year
    Replies: 1212
    Topics: 160
    #83566

    if the oring is just… out of place why not try to just reposition it ….push down on the plunger with a flat nail head to free up the oring and try to pop it back in place then release the plunger

    frankr
    frankr
    US Member - 1 Year
    Replies: 4323
    Topics: 43
    #83567

    If we dare assume it is an OEM OMC connector, the o-ring is part number 303598. Snag the old one with a home made wire hook and drag it out. Squeeze the new one double and slide it in & straighten it out.

    Steve D
    Steve D
    US Member - 1 Year
    Replies: 469
    Topics: 61
    #83568

    Sometimes a bit of a pain but saves some money.
    I would avoid Sierra…I like the way they have a warning sign near them.


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    olcah
    olcah
    US Member - 1 Year
    Replies: 325
    Topics: 69
    #83569

    Frank,
    Thank you very much. For this and lots of other assistance.

    olcah
    olcah
    US Member - 1 Year
    Replies: 325
    Topics: 69
    #83570

    Thank you Steve. Appreciated very much.

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    jerry-ahrens
    US Member - 1 Year
    Replies: 1016
    Topics: 70
    #83574

    When I was a kid, my dad used a ball point pen to install the new O-ring in those. It’s blunt tip won’t damage the O-ring so easily.

    Avatar
    amuller
    US Member - 2 Years
    Replies: 862
    Topics: 136
    #83789

    Having read this and other threads, I’m still confused. Want to replace the o rings in some leaky fuel line connectors. Probably also need to replace some valve o rings in the tanks. Can anybody provide a standard number for these? I don’t want to pay several dollars for an o ring that should cost several cents.

    The most common o ring sizing standard is AS568, the US Aerospace Size Standard for O-rings ( I think it used to be AN). I would think OMC would have designed around standard sizes. There is a chart of standards sizes here: http://www.applerubber.com/src/pdf/as56 … -rings.pdf

    Is it true that the tank valve o rings changed over time? Anybody know those sizes?

    Thanks.

    frankr
    frankr
    US Member - 1 Year
    Replies: 4323
    Topics: 43
    #83793

    Yes, there were two sizes of the tiny o-ring around the pin on the tank outlet (behind the brass retainer washer). As I sort of remember, if the hose connector goes on vertically, it is the early, small version, but if it goes on horizontally, it is the later, larger version. But I could be all wet.

    Sorry, I don’t know the sizes.

    Buccaneer
    Buccaneer
    US Member - 1 Year
    Replies: 3056
    Topics: 852
    #83794

    Here’s some charts showing OEM numbers and sizes.

    This is the o-ring I have in my notes for the dual fuel line connectors,
    from McMaster Carr
    https://www.mcmaster.com/9452k169


    Attachments:

    Prepare to be boarded!

    frankr
    frankr
    US Member - 1 Year
    Replies: 4323
    Topics: 43
    #83797

    Note that the NAPA (Sierra) 18-7111 for 301824 is wrong. It is too fat

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    amuller
    US Member - 2 Years
    Replies: 862
    Topics: 136
    #83805

    Well, thanks. Looks like there are three numbers: 334913, 303598, and 331380. Dimensionally they are given as the same, so maybe a material or hardness (durometer) difference? Plus there is the Sierra number 18-7150. These don’t seem to correspond to any standard industrial size, which must be the reason they are expensive, like $2 + /per each?

    Avatar
    amuller
    US Member - 2 Years
    Replies: 862
    Topics: 136
    #83940

    I think there is confusion here between the tank valve parts and the connector parts, even though the heading clearly says "Single hose fuel connector…."

    In any case, the fuel connector O ring is called a quad ring, which is something with a square section, on Marineengine.

    They list two: 307858 for $1, and 322488 for $4. Both are OMC numbers, of course. Anybody know the difference?

    frankr
    frankr
    US Member - 1 Year
    Replies: 4323
    Topics: 43
    #83950
    quote amuller:

    I think there is confusion here between the tank valve parts and the connector parts, even though the heading clearly says “Single hose fuel connector….”

    In any case, the fuel connector O ring is called a quad ring, which is something with a square section, on Marineengine.

    They list two: 307858 for $1, and 322488 for $4. Both are OMC numbers, of course. Anybody know the difference?

    What parts list shows quad rings? I guess I’m too old and haven’t seen them in fuel connectors. Not a bad idea though.

    Avatar
    amuller
    US Member - 2 Years
    Replies: 862
    Topics: 136
    #83979

    http://www.marineengine.com/parts/johns … =Fuel+Tank

    Items #20. I’m going to pull out some rings from old connectors today and take a look.

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