 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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| Dave_Darling |
Aug 17 2025, 02:20 PM
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#2
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914 Idiot Group: Members Posts: 15,223 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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914 fuel tanks are not pressurized--the whole charcoal canister system is there to prevent that.
Leak test it; you can put whatever liquid you like in it, plug the outlets on the bottom of the tank, and see if there are any pinholes. The areas where the tank sits on the felt pads in the body are prime spots for them. --DD |
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| 930cabman |
Aug 17 2025, 02:40 PM
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#3
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Advanced Member Group: Members Posts: 4,228 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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QUOTE(Dave_Darling @ Aug 17 2025, 02:20 PM)  914 fuel tanks are not pressurized--the whole charcoal canister system is there to prevent that. Leak test it; you can put whatever liquid you like in it, plug the outlets on the bottom of the tank, and see if there are any pinholes. The areas where the tank sits on the felt pads in the body are prime spots for them. --DD (IMG:style_emoticons/default/agree.gif) the fuel tank is not pressurized in service, why now? If it's not showing any signs of heavy rusting, clean it up and drop it in |
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Posts in this topic
DennisV Fuel Tank Prep for Install Aug 17 2025, 08:17 AM
Montreal914 Could it be just old fuel varnish? Seems a bit shi... Aug 17 2025, 10:22 AM
fiacra
Could it be just old fuel varnish? Seems a bit sh... Aug 17 2025, 02:56 PM 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 porschetub
914 fuel tanks are not pressurized--the whole ch... Aug 17 2025, 11:30 PM |
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