Leak on top of fuel tank

Hello all,
So I had an issue a while back with my fuel tank pump or sending unit not working because it would mark the tank empty after I filled it up. I bought a new pump and sending unit and took the bed off to access the top of the tank. As I was taking off the top cover of the tank, one of the screws broke off. So the first mistake was drilling out part of the screw to try and get a hole. I drilled it all the way through. I thought if there was a hole I could cover it up instead of leaving the screw in. The second mistake I made was using normal silicone after I put the new parts in to seal the gap. I didn’t know there was a difference but I learned because it leaked again after it ate through the silicone. Then I took the bed off again and decided the best way to fix this problem was to tap a new thread to add a bolt to it. It was a miracle it worked. I was honestly surprised. I found a bolt that barely made it. I thought it would be fine but I noticed it started leaking again. The bolt goes a little in the tank and my guess it is leaking up through the threads. What can I do about this to fix it?

 

Here it is with the silicone.
Here it is with the new bolt.

 

Did you replace the gasket and really clean the gasket surface? That’s the first places to start

 

Yes. The new unit came with a new gasket and yes I made sure it was cleaned because there was silicone around that raised part of the tank where the screw holes are at.

 

I'm not sure how much luck you'll have getting a true vacuum seal having drilled out the hanger and tank. Best bet might be to track down another tank from a part-out truck on marketplace/craiglist (98-00, 4x4 or prerunner) and make sure it comes with the hanger. Transfer your fuel pump and filter to it. Grab a new gasket from toyota. Should be able to keep it all under $150, just gotta be patient waiting for the right parts truck to show up in your area.

I recently picked up a full tank assembly (filler neck and fuel pump hangar & pump, skid plate and tank strap) for 75 bucks from a guy in orange county. Not sure where you're located but used fuel tanks don't seem to be a very hot item on these trucks in desert climates. But maybe that was just lucky.