FFR Fuel tank assembly - sealant or not

[Honest Ernie]

Hello Everyone. Putting together the FFR fuel tank on my cobra build #10314.

I see there are no gaskets that go along with the sending unit etc. Have any of you used some sort of sealant when putting the fuel tank together? Or is the locking rings tight enough? Please advise. Honest Ernie

[JeffP]

There should be an o-ring that goes under the locking ring. Mine came with two, one for the sender and one for the fuel pump.

https://www.dormanproducts.com/p-18046-579-003.aspx

[Honest Ernie]

There should be an o-ring that goes under the locking ring. Mine came with two, one for the sender and one for the fuel pump.

https://www.dormanproducts.com/p-18046-579-003.aspx

Thank you Jeffp - I had a second look in the box and found the two o-rings hiding in there.

[rich grsc]

NO sealant, just a light coat of engine oil on the o-rings when you install them

[GTBradley]

it looks like the sending unit and fuel pump o-ring are the same part number? Is that correct?

Thanks,

[Jhinkemeyer]

it looks like the sending unit and fuel pump o-ring are the same part number? Is that correct?

Thanks,

Yup.

Also lots of folks (including me) had issues with the included square profile O-ring leaking. I bought a bag of 10 from Amazon (https://www.amazon.com/gp/product/B0051XXJJ0/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1), and now have 8 spares lol.

[rich grsc]

Never never ever had had a square shaped ring leak. You have to apply some engine oil to them

[GTBradley]

Thanks. I pulled the access panels and it appears that the leak maybe at the vent check valve anyway. I’m going to drop the tank and see what I can find out.

[GTBradley]

Never never ever had had a square shaped ring leak. You have to apply some engine oil to them
And most oil filters have the flat, or square o-ring too. I didn’t like spending $20 on two lock rings with o-rings though, so I’ll get that bag of o-rings instead.

[rich grsc]

The square profile was used by Ford in maybe a 100 million cars