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Welders like having all the prep work done, that is 90% of the work. On these tanks, the metal is fairly thick but use care in removing the paint around the holes to avoid thinning. On the inside, I used acetone rinse, then let that air out, followed by phosphoric acid rust treatment. Then...

If you were closer, I have gotten good at TIG welding those pesky pinholes. First, it must be clean. Then, clean inside. I use a burr to open the hole until back to good metal, then slowly fill the edges until closed after argon back purge. I would recommend POR tank sealant. I used hot...

Both pumps are needed to keep the injector pump lubed and cool. It is fine for short periods but for ultimate reliability, both should run.