Gas Tank Lock Nut

99XJ 4WD I6 220K

I am replacing the fuel pump and no matter what, the gas tank lock nut wouldnt budge, so I just cut it and bought a new one from the local stealership.

The new one looks exactly the same, but in black. I tried a dry run first and soon after the thread catches it becomes difficult to spin. I then start turning it by hitting it gently with a large flat head screwdriver and a mallet, but it pops out.

1. Is it possible that I got the wrong nut?
2. Is it possible that I am doing something wrong.
3. Any ideas why I was not able to take off the ring? This is the second time when I am replacing the fuel pump. I did not have any issues the first time around, neither disassembling, not assembling.

I would appreciate your fast reply as I need the truck for tomorrow.

Thanks in advance.

The "mason jar" type lock ring?

You need to seat.the.gasket on the tank, then slide the pump in, trying to force the gasket in with the lock ring would make it very difficult.

Thanks for the reply, I dont have problem with the gasket.

I was saying that the lock nut would screw in. I was trying to do that without the pump in place.

It is not the easiest to get that part threaded back on. I press down evenly on it and use a screwdriver and hammer. That's how to get them off too. Just keep moving the screwdriver all around and eventually it will start moving.

It is a PITA... Just keep trying... It took me over 1/2 an hour of try after try to get it on properly.

yeah, its a pita. Keep at it, try not to cross thread it when you start it. You need downward pressure as well as turning.