kolsen911

So I'm working on a retractable radio antenna and I stopped to look at the fuel tank sender.

I messed with this a while ago. Gage moves left and right so I assumed I need to use up the gas and pull the sender out and replace. Well yesterday while under there I noticed there are no screws holding the sender to the tank. Almost looks like it is a twist to fit. Could that be????????

Nowhere Man

Yes it's a lock ring. All GM cars used them well into the 80's

Jackfit

Hi, you can get one (removal tool) from any of the vendors.....best way to get sender off without damage, and best way to put on...

Jack

Gary's '66

Many will say to just use a drift punch, large flat blade screw driver, etc. I say, BUY THE TOOL!

A little lubricant on the rubber O ring helps as well.

Gary

Powershift

I would go one step further and say buy/install a new GM locking ring and GM or OER reproduction o-ring. Lube the oil ring with Vaseline before assembly or let it sit overnight in engine oil like the factory did.

Part numbers to follow shortly:

Rubber seal is GM #3825206

Metal cam/retainer is GM #3774937

Ebay is good place to buy both...............don't use a non-GM retaining ring. GM or the OER reproduction rubber seal are both good to use.

Larry

kolsen911

Thanks guys I'll look them up

Frankie the Fink

Don't throw away that old sending unit!

Often they can be repaired and I've had mixed results with the Chinesium repros...
You may find you have to re-use the original after fixing it.

Powershift

My friend has a 1969 with the original sending unit. It was a TOTAL MESS and was corroded badly. He sent it to John Wolfe and Company in Ohio and received it back looking and performing as NOS.

FWIW.

Larry