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Im completely redoing my fuel system with 6an fittings, steel braided line, pre LP 30micron spin on filter, Raptor 100, 10 micron spin on filter and a feed the beast IP fitting.

Anyways I dropped the tank to clean the inside, remove the sock and paint the outside of it. When I pulled the sending unit out, it is covered in what looks like a white wax or something around the tank ring /lock ring. Is this some sort of sealant? I was planning on getting a new o-ring but now sure if thats all I need.

Thanks
 

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When I redid mine I just removed the wax. Upon re-install I just used the o ring.

I could be wrong but 100,000 miles later, no problems.

Brian
 

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I just used a crapload of grease on mine
 

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That's how they come from the factory. Go to your local hardware store and get a wax ring for a toilet and melt in on there with a torch.
 
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That's how they come from the factory. Go to your local hardware store and get a wax ring for a toilet and melt in on there with a torch.
?????? An open flame to help seal a fuel tank opening??? Please tell me this is an April Fool's Day post!

The rubber O-ring seal for the fuel tank sending unit is replaceable and available at most parts stores. The white wax-like substance is most likely lithium grease applied to keep the retaining ring from tearing the rubber as it's rotated into the lock position. I lubricated mine with some liquid dish soap. ~FH
 
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Iirc ,I believe I slathered some silicone over the top of the edges of the metal ring after installation, just to satisfy my paranoia
 

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?????? An open flame to help seal a fuel tank opening??? Please tell me this is an April Fool's Day post!

The rubber O-ring seal for the fuel tank sending unit is replaceable and available at most parts stores. The white wax-like substance is most likely lithium grease applied to keep the retaining ring from tearing the rubber as it's rotated into the lock position. I lubricated mine with some liquid dish soap. ~FH
Umm...... You're not pointing the flame directly at the tank. :rolleyes: You hold the wax ring above the sending unit and let it drip onto it. I've done it 3 times without killing myself...Diesel doesn't explode anyway, it just burns.
 

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?????? An open flame to help seal a fuel tank opening??? Please tell me this is an April Fool's Day post!

The rubber O-ring seal for the fuel tank sending unit is replaceable and available at most parts stores. The white wax-like substance is most likely lithium grease applied to keep the retaining ring from tearing the rubber as it's rotated into the lock position. I lubricated mine with some liquid dish soap. ~FH
The wax-like substance isn't lithium grease to help the o-ring seat, it is a hard wax that covers the ring/seal/everything. I just did mine and had to chip it off - looks exactly like GM melted a bunch of wax on top of the ring clip until the recess was full.

Personally I thought it was aftermarket, seems like too good of an idea to come from the factory :whistle:

I just smeared about half a tube of grease on mine when I put it back in - figure that should keep things from rusting.

Given that diesel requires a ton of heat for combustion, I'd say you'd be fine melting a wax ring like mentioned assuming you don't point the flame into the tank. Completely up to you though, I would just go the grease route and be done with it...
 
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