Gas Sending Unit O Ring

[samkost]

I ordered a new sock strainer, O-ring and a new plastic float for the 72'.
My in cab tank is clean and the sender unit is in excellent condition.
The sock strainer however was splitting at it's seam so I ordered the above parts.
I forgot to notice the orientation of the O-ring tab l when I removed the sender rings and seal.
Does the little tab on the rubber O-ring need to be installed in a certain clock position or not?
Is that tab just a finger grab?
Thanks, Sam

[NorCalC20LWB]

Curious also

[Sheepdip]

I put one in a couple of years ago and I don't really recall the little tab. Some good advice though is to coat it real good with Vaseline, it helps it spread and seal.

[Threerun]

Originally Posted by samkost

I ordered a new sock strainer, O-ring and a new plastic float for the 72'.
My in cab tank is clean and the sender unit is in excellent condition.
The sock strainer however was splitting at it's seam so I ordered the above parts.
I forgot to notice the orientation of the O-ring tab l when I removed the sender rings and seal.
Does the little tab on the rubber O-ring need to be installed in a certain clock position or not?
Is that tab just a finger grab?
Thanks, Sam

I replaced my in cab tank sending unit in the fall. I used lubed the rubber o-ring and I oriented that tab to about the 5 O'Clock position (based on your lock ring photo). It still took about a Gorillas forearm worth of pressure to get it all locked on to the point I could tap her shut.

[samkost]

I did some more searching and read a few past posts here on our forum.
Some O-ring seals for sale are offered without the small inside tab.

Sheedip and Threerun, Thanks for your replies.

Vaseline makes sense since it’s petroleum based. Will do!

On a safety note I read from a member here, you should use a brass punch on the lock ring tabs when removing or installing to avoid the possibility of creating sparks.

Also to tap the lock ring tabs evenly around the circumference to keep the seal and lock ring centered when tightening.
Still curious about that O-ring tab.
Sam

[SRU1436]

I replaced mine a few months ago and I thought there was a spot on the bask side of the sending unit for the little tab on the O ring. I could be wrong though, sorry can’t remember. I’ve had no issues. It was very straightforward.

My filter sock had disintegrated so I had to replace mine as well. I ordered a plastic float as I read the new gas will eat a hole in a original floats.

[samkost]

It’s always something
My parts came today so I installed the new float, O-ring, and sock on the tank sending unit.
Everything went smoothly until I turned on the key to check the gas gauge with the new float.
Gauge was reading just above empty with 1/3 full tank.
Added 5 more gallons and got the same reading.
Did my electrical tests and everything worked outside of the tank.
Fiddled and cursed a bit
Turns out the locking ring twisting around the sender wasn’t making a good ground contact.

Hope my learning experience helps someone when it comes to putting in a gas tank sending unit.

[54blackhornet]

How did you replace the sock ? The one I have is crimped onto the end of pipe ?

[samkost]

My 1972 C10 sock strainer is just pressed fitted onto the 3/8 in. sender pickup line.
I pushed it on and didn’t have to crimp mine.
The old sock ring needed pliers to remove.
There are two size diameter of socks, 3/8” and 5/16”, depending on your sender unit line.