There are a few ways to do it. I'm going with vinegar, it's cheap and I have the time to let it sit.

I'm assuming that I would have to remove the fuel pump from the tank rather than letting it sit submerged in vinegar. Then I have the issue of plugging that big oval hole back up.

Is it okay to let that whole assembly consisting of the fuel pump etc in the vinegar?

The rest if pretty simple. I will neutalize it, dry with hair dryer, degrease, and will be using POR 15.

 

I've always used the Kreem tank kits, usually take a couple packages of 3/8 nuts and toss in and shake it all up to help remove the larger bits of rust. The last time I did a FI tank I made a temporary plate from a gallon plastic jug, drilled mounting holes, mounted it up and siliconed around the plate, never had issues (knock on wood)

Ape

 

Bu the way Seafoam can it be used for it or it not gonna remove all the gunk?

 

I have never used it to "clean" seems to expensive to do it that way to me, I don't know how effective it acts as a cleaner for rust and corrosion.

 

Have used a gallon on acetone to remove residue, first.
Then follow with a pile of copper pennies, and rattle the coins until the rust is removed, then rinse with acetone.
Then apply a tank linner

 

If it is just rust, and not a failing liner, there is no need to go crazy with dangerous chemicals.

Just buy the POR 15 kit, and add a handfull of stainless sheet metal screws into the tank when you are cleaning the rust out, and slosh them around.

Count how many screws you put into the tank...

Avoid Kreem tank liner like the plague.

 

I was thinking of putting the whole fuel pump, EFI assembly in a condom but I'll go with that plastic seal and silicone.

 

Use only the KITS -- as using vinegar will make the inside of the tank FLASH RUST, using the kit contents will not -- try a auto rubber freeze plug to close up the fuel pump hole

 

The flash rusting are the same thing the instructional videos say. That's why I'm using a heat gun or hair dryer immediately after after I drain and neutralize it, one step immediately after the other.

Unfortunately those plugs won't fit, mine is a irregular oval shape.

 

Why do you say to avoid Kreem? I'm very interested to kow your thinking.