 Fuel Tank Prep for Install, Should I Pressure Test It |
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| DennisV |
  Aug 17 2025, 08:17 AM
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Senior Member  Group: Members Posts: 682 Joined: 8-August 20 From: Santa Rosa, CA Member No.: 24,575 Region Association: Northern California 
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I'm planning to refurb our fuel tank this trip. Should a fuel tank be pressure tested? If so, how the heck do I do that? This is a 914-6 carburetor car, if it matters.
It is out of the car and appears to be in very good shape. It hasn't had anything in it for many years. I would love to think there is some high tech copper coating in the bottom, but I suspect that is surface rust. I am thinking that a couple gallons of Evapo-rust for a few days will solve that. Also provide some evidence if there are major leaks. Then probably fog it with Sea Foam, since it will probably be months before it's actually attached to the engine. Anything I'm missing before it would go back in the car?  |
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| Montreal914 |
Aug 17 2025, 10:22 AM
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Senior Member Group: Members Posts: 1,898 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California
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Could it be just old fuel varnish? Seems a bit shiny for being rust.
Tank looks very clean otherwise. I would replace the sock at the fuel line pickup. |
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| fiacra |
Aug 17 2025, 02:56 PM
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#3
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Person.Woman.Man.Camera.TV Group: Members Posts: 596 Joined: 1-March 19 From: East Bay Region - California Member No.: 22,920 Region Association: Northern California
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QUOTE(Montreal914 @ Aug 17 2025, 09:22 AM)  Could it be just old fuel varnish? Seems a bit shiny for being rust. Tank looks very clean otherwise. I would replace the sock at the fuel line pickup. (IMG:style_emoticons/default/agree.gif) Just looks like varnish. From what I can see I would simply clean it with Por15 cleaner/degreaser. I only needed a quart (link below). I did that with my Super Beetle tank that had been sitting for 16 years. It looked in similar condition to yours (again, from what I can see) and it cleaned up just fine. I wouldn't clean the tank until just before you are ready to install it and put fuel in it. If it sits for a while you could get light surface rust. If it is going to sit for a while make sure you seal the openings well and keep it in a warm dry place. After cleaning I used a hair dryer to make sure the inside of the tank was as dry as possible. There are more than a few videos about this on-line, some good, some done by idiots. You'll quickly figure out which is which (I woudn't, as an example, dump out the cleaner on my front lawn when I'm done). https://por15.com/products/cleaner-degrease...Z4jySTdOJuFFBmb |
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Posts in this topic
DennisV Fuel Tank Prep for Install Aug 17 2025, 08:17 AM
DennisV
Just looks like varnish. From what I can see I w... Aug 17 2025, 04:14 PM
fiacra
[quote name='fiacra' post='3219839' date='Aug 17 ... Aug 17 2025, 04:45 PM Superhawk996
Just to be clear, I'm not recommending the ... Aug 17 2025, 05:28 PM fiacra
[quote name='fiacra' post='3219847' date='Aug 17 ... Aug 17 2025, 05:46 PM Superhawk996 So you recommend using the POR Metal Prep after... Aug 17 2025, 07:45 PM Superhawk996
Just looks like varnish. From what I can see I ... Aug 17 2025, 05:24 PM Dave_Darling 914 fuel tanks are not pressurized--the whole char... Aug 17 2025, 02:20 PM 930cabman
914 fuel tanks are not pressurized--the whole cha... Aug 17 2025, 02:40 PM porschetub
914 fuel tanks are not pressurized--the whole ch... Aug 17 2025, 11:30 PM |
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