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Thread: Fuel level sensor gasket

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    Fuel level sensor gasket

    Filled tank up the other day. Have a leak from somewhere on the top of the tank. Siphoned about 4 gallons and drip stopped. I suspect the fuel level sensor gasket? Lowering the tank for examination will have to wait until my lift is clear of another "project".
    What is the part number for the sensor gasket? Where to get it?
    Spent an hour searching online to no avail.
    Thanks in advance!

  2. #2
    Administrator 65 Cobra Dude's Avatar
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    Mark Reynolds at Breeze Automotive should have them.

    Henry

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    Senior Member rich grsc's Avatar
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    Try google : mustang fuel pump gasket

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    Factory Five supplies an "O" ring with the kit. The parts come packaged with a square shaped O ring. (that sounds wrong) FFR supplies a round shaped o ring that should be used.
    FFinisher/AKA RE63

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    Senior Member rich grsc's Avatar
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    Quote Originally Posted by FFinisher View Post
    Factory Five supplies an "O" ring with the kit. The parts come packaged with a square shaped O ring. (that sounds wrong) FFR supplies a round shaped o ring that should be used.
    The square shape is the correct one to use. Coat it with engine oil when installing it.

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    Quote Originally Posted by rich grsc View Post
    The square shape is the correct one to use. Coat it with engine oil when installing it.
    I use the round one. They don't leak,which is why FFR has supplied them, I have used these on .... probably 20 builds for the sender and the pickup or pump hanger.
    FFinisher/AKA RE63

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    OK, opinions are mixed.
    Is the same seal used on both the level sensor and fuel pump?

  10. #9
    Senior Member edwardb's Avatar
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    Quote Originally Posted by davekp View Post
    OK, opinions are mixed.
    Is the same seal used on both the level sensor and fuel pump?
    Yes. You'll get mixed opinions on round vs. square. I've used both and haven't had an issue. Properly installed I think either will work. Using some lube is important. Or some recommend a very light coat of gasket sealer. Like Permatex or whatever. But probably you'll get different opinions about that too. One other thing though. Check to make sure it's not the filler tube seal that's leaking. My experience is that a failure there is more common than the two you've mentioned. Also can be affected by how much gas is in the tank.
    Last edited by edwardb; 12-02-2019 at 11:59 AM.
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    Senior Member frankb's Avatar
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    I have a new one (2-1/4" dia. approx square cross-section o-ring) that I will mail to you if you wish. PM me
    Last edited by frankb; 12-02-2019 at 08:22 AM.
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    Senior Member rich grsc's Avatar
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    Ford in the past always used the square cross section gasket, I see now that they use the round shape, so yes, either is fine to use. If you think you will need to remove the sender or fuel pump in the future, then a lube such as oil is highly recommended, I think Permatex would be difficult to get apart, and then cleaned up?

  13. #12
    Senior Member cnutting's Avatar
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    I had square ones and they leaked. Tony Z sent me some o-rings and that fixed it. Also replaced the fill tube seal with a Ford part as edwardb suggested since the kit supplied one developed a leak.
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  14. #13
    Not a waxer Jeff Kleiner's Avatar
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    Quote Originally Posted by davekp View Post
    OK, opinions are mixed.
    Is the same seal used on both the level sensor and fuel pump?
    Dave,
    They are both the same. As I recall when I built your car I used the square profile rings on both...but that's been 6 or 7 years ago and I can't even remember what I did last Tuesday so I could be wrong! As others have said though either will work.

    Jeff

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