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We arranged a little Datsun meet at a friends place! (2 more Datsun Z in his work shop)

he may be referring to the sock that is located in the tank on the fuel pickup. I don't understand how the various coatings work around that (or even if there is such a thing). I paid a bundle to get my tank done, guy cut it open sand blasted, removed sock, welded back up and re sealed with something, then painted outside. the guy that did my tank did mention the sock filter inside my tank (I did not see ) so I assume it really is in there. If I had my borescope back then I would have used it to confirm, but its all done now, no leaks and no fuel problems. I am not doubting others that have endorsed DIY with redkote or POR15 just giving you another actual example. IIRC the guy was one of those franchise fuel tank refurb. Not that that means anything, but they are nation wide. Of course the francise means nothing its all the skill of the guy doing the work. I did take my tank to a rad shop, they looked inside and said "red kote" and would not touch it. That's when I was referred to the other guy. He did say the cost was higher than normal due to all the various inner walls etc. on my tank. All the above is just FYI, there is no reason to go down tank refurb until you have CONFIRMED the tank is the problem. You have to things on the table to do first. several others have posted how to confirm the pump/electrical supply. that should be checked 1st before committing to any major tank overhauls. The hard wired pump and separate fuel can would be a start. think I said already but you should also do a flow test, plugged fuel filter and stuffy fuel lines. what kind of pump is installed now? does it have a screen on the inlet side?

+1 on Dad's advice. This Kim guy is trying to take advantage of you for sure. And for future reference, POR 15, and probably Red Kote too, are removable with POR 15 Solvent and other paint removers. I know the current fuel problem is frustrating but it's entirely fixable. We've all been there and I'm not going to muddy the waters with more advice. Go slow and be methodical.

That's just BS, trust your Dad. Many of us here have restored our tanks using POR15 or Red Kote and they fine. It is easy to get overwhelmed with all the little stuff that pops up on these cars, try and focus on one problem at a time. You have been given some very good advice, go through each method that has been suggested and report back on what you found when you tried it. Try not to get too stressed it will just cloud your thinking.

It will be alright My test above, running direct power to the new fuel pump, will help you isolate it it is a blockage or an electrical issue. You haven't eliminated the possibility that the Ecu or AfM may also be causing intermentant issues. I would agree with your father in this instance. For that price you could likely find a really good clean used one. Heck, I had huge rust issues in my sons old 280z and I never even sealed it. Acid wash and lots of water to flush. Ran a hair dryer for about an hour to dry it and threw some motor oil for a quick coat. Installed and filled with gas and never looked back. siteunseen had a good process: