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Gas Tank restore and POR15

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I used POR on one of mine almost 20 years ago and its still fine. Used nuts and bolts and anything else that would help scrape the tank clean before I started the POR treatment.

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FYI, Natchez Machine & Radiator says they will give it the chemical bath (i.e., boil) and only charge me about $45, so that'll be the first thing I'll do after I drop it.

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What would be the problem with missing one or two nuts/bolts, anyhow? 

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My guess is nothing fuel delivery wise. But I wouldn't want a few nuts and bolts rolling around the bottom of my coated tank.

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1 hour ago, Mark Maras said:

My guess is nothing fuel delivery wise. But I wouldn't want a few nuts and bolts rolling around the bottom of my coated tank.

But wouldn't those nuts or bolts be coated too and stuck to something.

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I guess we know @grannyknot isn't OCD. I'd wake up in the middle of the night in a cold sweat thinking about that one rogue bolt. :-)

 

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1 hour ago, grannyknot said:

But wouldn't those nuts or bolts be coated too and stuck to something.

 Probably the bottom of the tank but that could lead to a discussion about how many is permissible all the way to why the hell take any out. They're all glued down anyway. The PO of my 260 used 3/4" (no minus) crushed rock and rolled the tank around the yard for an hour or so.

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If you're cleaning the tank why would you not get out the things that are in the tank? Makes the whole thing pointless IMHO.

I've only done two but you could hear a fly buzzing around in those big empty cans. 

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Step 1 is done. Dropped! Tank goes to the radiator shop Monday. Noted that there was no O-ring on the sending unit. Both of the big vapor hoses along the tail were dry-rotted. Anyone know of a good source for them?

IMG_20200516_164716.jpg

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Before you send it in, you might want to remove the rubber pads. They might disappear when the tank gets cooked.

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Posted (edited)

If this doesn't cover the hose replacement question you have, I don't know what will.

Edited by Zup

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The longer 6+ ft vent hose that runs to the opposite side was at one point replaced with a 1/2" heater hose. Argh. You can see in the pic where is has rotted out where it meets up with the tank.

And the "special" large vent hose with the preformed bend is toast. Between this and the fact that my shifter boot was disintegrated, it's no wonder the cabin reeked of fuel and exhaust. 

The other linked thread was useful, although there are a lot of dead links to reference and parts sites. This last pic was buried in there. Diagram of the tank with hose sizes called out.

IMG_20200517_133540.jpg

IMG_20200517_133515.jpg

Screenshot_20200517-131723.png

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I'm seriously considering replacing the steel  fuel supply line. Spent the afternoon repeatedly flushing out the line with break cleaner, and carb cleaner. Plugged it and let it sit for an hour, etc. Some say to use lacquer thinner. 

At any rate, debris keeps coming out. I may try pipe cleaners or flossing with weedeater line, but am also considering buying a set from classictube.com.

I'd sure like to know why the 1973 version is almost 3x the price of the 1969-72 versions. 240z fuel supply line

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 I seem to remember someone using braided steel cable to clean the lines. He inserted the cable all the way thru the line, frayed one end of the cable. hooked a drill motor to the other end and with the drill motor running he slowly pulled the cable back thru the line. I've not tried it but it sounds like fun.

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Argh. Just got my zcardepot order in for some of the vent hoses.  

See pic. The special bend hose I thought I was getting is much smaller. Is the one in the package supposed to go on the vent opening just above the sending unit? It obviously doesn't fit the 5/8" vent near the back right bumper. That's the one that was rotted. I guess at this point I'll go buy four feet of that and two elbows. :-(

IMG_20200522_122800~2.jpg

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that's what i did. Nobody will see it but you.

5/8" low psi fuel hose from O'reillys and two 3/4" pex 90s.

This isn't my car but you see what I'm talking about.

image.jpeg

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Did the POR15 tank seal process today. Now to let it cure. Before/after pic....

Screenshot_20200523-172425.png

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Thanks. Some of the rubber grommets back there (and under the hood at the firewall) are either missing or deteriorated. Anyone successfully use something like Versimold to make various grommets?

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Thanks. I may pick up one or two of those from Banzai, but some of the prices are just absurd. I can't stomach paying $80 for a choke cable grommet, for instance. Or $80 each for strut tower caps.

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I bought mine at local Nissan dealership. The heater hoses through the firewall and the rear hatch. Google these numbers, I don't remember which was which.

20200524_122112.jpg

20200524_122055.jpg

 

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Regarding the odd fuel hose:

I think I used some cloth-covered hose (common on some German cars) and something like this (not this one specifically) to get that U-bend:

https://www.fastenal.com/products/details/0421896

Make sure all replaced hoses if not OEM are rated for fuel. 

I also looked at universal molded fuel line by RetroMotion Innovations but didn't go that route.

https://www.retromotioninnovations.com/products/3-8universalmolded

you just cut out whatever part you need and splice a standard fuel line to it.

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