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1968 Charger Gas Tank Leak

A couple of things. I received the OEM lock ring I purchased off eBay. The aftermarket one that was on the car is actually thicker (aftermarket is the clean one). Isn’t the whole purpose of the OEM lock ring that it’s thicker? Also the last picture is of the lock ring before I took it off the tank. Is this on correctly?

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You have to spin the ring to the right until the little bump on the lock ring sits under the raised area on the tab. It’s hard but if you lube it up and use a tool, it will go.
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You have to spin the ring to the right until the little bump on the lock ring sits under the raised area on the tab. It’s hard but if you lube it up and use a tool, it will go.
View attachment 1910247
Well hell, no wonder the tank was leaking if I didn’t even have the lock ring engaged completely. I don’t have a “tool” though? Do I have to use a specific tool or is there something else I can use?
 
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So additional question. There’s not any more adjustment on the sending unit. It only reads half full when it’s completely full. Is this just a crappy unit?

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I'm having the same problem. For me its reading 1/4 when the tank is very close to being full. Weir thing is, if I take the unit out, turn it upside down and test it, it will show 3/4 of a tank. When I try and install it the way it works better, it won't go in all the way. I can only put it in one way. It seems like the pickup is hitting the bottom of the tank.
 
You have to spin the ring to the right until the little bump on the lock ring sits under the raised area on the tab. It’s hard but if you lube it up and use a tool, it will go.
View attachment 1910247
I'm trying to find out why my gauge is only showing 1/4 of a tank when its full, and I took out the sending unit twice now. It's a pain in the *** laying on my back, trying to squeeze my big head between the rear and wherever I can put it, to be able to see anything. Takin it apart isnt that bad, but putting that damn ring on like this is a damn pain in the neck, literally.
 
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