OMC Pressure tanks fuel hose connector O-rings

[Buccaneer]

I had some o-rings in an envelope, marked as 301824.
When I went to replace the originals in the fuel hose
connector, I noticed the ones I had in the envelope
had about .034 larger outside O.D.
I bought these several years ago. I wonder if whoever sold them
used Sierra o-rings, or perhaps the McMaster-Carr #107 that
is supposed to work.
Anyway, I used the new, larger O-rings, and hooked up the connector
to a motor, and it seem to work fine.
Anyone else run into this issue with “bigger” o-rings?

I hadn’t changed any connector o-rings out for quite a few years, but
luckily found my bootleg fixture to take the guts apart.
Found out that a little heat from my bottle torch worked wonders.

One finished, one to go

Just about getting tired of working on gas tanks, but I ran out
of virgin outboards to work on.

 

Prepare to be boarded!

[labrador-guy]

Yours O rings look a lot better than the ones I just got in a new kit.  I had some that I purchased from Ede at Tomahawk.  Glad I have some extras.

dale

If you can’t take the winter you don’t deserve the summer!

[Buccaneer]

Dale, I have some #107 O-rings on order for the future,
and will be curious to see how they measure up to the others.

Prepare to be boarded!

1 user thanked author for this post.

RICHARD A. WHITE

[RICHARD A. WHITE]

The 107 o-rings are “smaller” but still work, they just do not apply as much pressure to the pins as the original.
The cup that holds the ring, just imagine the original ring is four ounces in that cup, the #107 fills like 3 ounces and still works.

Frank used them for one reason….cost
They fit, they perform by sealing things up.

Cost of an original OMC ring: Currently $3.10
Cost of a bag of 100 pieces of the #107 o-ring from McMaster-Carr: $3

That is why I include them with the tool.

Richard

http://www.richardsoutboardtools.com
classicomctools@gmail.com

[Steve D]

The other reason is that the 107’s are the exact same size as the original 301824’s.

[Buccaneer]

Thanks for the replies. I’m now confident that the 107 o-rings
for future use will perform okay.
I’m still going to measure them against the OMC rings (supposedly)
that I just installed for curiosity.

Prepare to be boarded!

[Steve D]

Yeah I wondered the same thing Buc. That was one of the reasons Frank suggested using them, and the chart bears it out (which might have been originally posted by Garry). And if Frank said it, it was good enough for me. I’ve been using them for years since then and never had a problem.

[Author]

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