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 Fuel tank '79
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x96
V4 Fanatic

Spain
314 Posts

Posted - 28 Feb 2021 :  22:47:49 Show Profile Reply with Quote
I have had problems with the carburator because of the dirty and rust from the fuel tank.
I've been looking for pictures of the interior of the tank but I didn't find anything except that one that is of earlier models.

this is why I post this pictures in the case it helps someone else.
Initially I thought it was possible to clean it without opening, after reading differents opinions and advice, like adding nuts, but mine was that bad that only opening it permits to clean it correctly.

I cut the bottom as it was badly corroded with little holes. I will have to change the bottom part with fresh steel.





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Héctor

Edited by - x96 on 28 Feb 2021 23:21:02

x96
V4 Fanatic

Spain
314 Posts

Posted - 28 Feb 2021 :  22:50:51 Show Profile Reply with Quote
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Héctor

Edited by - x96 on 28 Feb 2021 23:29:16
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x96
V4 Fanatic

Spain
314 Posts

Posted - 28 Feb 2021 :  22:58:10 Show Profile Reply with Quote
After sanding I used strong vinegar special for cleaning and citric acid. First I bought it in a concentrate bottle and when finished I squeezed lemons, it worked very well. removed the rust from the little holes and narrow angles. And it is ecological

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Héctor

Edited by - x96 on 28 Feb 2021 23:28:52
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x96
V4 Fanatic

Spain
314 Posts

Posted - 28 Feb 2021 :  23:06:57 Show Profile Reply with Quote
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Detail of the non returning valve:

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The weather was wet so half hour was enough for the rust for coming back, I quickly have to apply a layer of antirust paint but I'm not sure it tolerates the petrol so I will add another layer of epoxy resin special for fuel tanks with unleaded.

to be continued..

Héctor

Edited by - x96 on 28 Feb 2021 23:13:07
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christophe
V4 Fan

France
125 Posts

Posted - 01 Mar 2021 :  17:16:19 Show Profile Reply with Quote
Thanks for the pictures.
I have a '79 too and these kind of details are always interesting.
Nice evening to all.
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andydeans3
V4 Guru

United Kingdom
1572 Posts

Posted - 03 Mar 2021 :  12:24:56 Show Profile Reply with Quote
X96.
Excellent thread.
I had the tank out of my car recently. Very little sediment came out when I drained it. Once it was out of the car, I put a little petrol in and swished it around, and again, very little crud came out. I also inspected the inside with an endoscope, and it looked pretty clean. I couldn't see right into the point where the suction pipe intake is, because it seemed to be inside a box, that I couldn't get the endoscope into.
I did consider cutting the top off the tank, to get better access, but was very worried about being able to get rid of the petrol fumes. Since it seemed fine, I just left it.

For the future, what did you do to make it safe to cut the tank open?
Andy



1978 LHD SAAB 96
1978 MGB Roadster
2008 LHD "Classic" Renault Twingo
1991 Nissan Figaro

Edited by - andydeans3 on 03 Mar 2021 16:09:39
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chris steeden
V4 Fan

United Kingdom
147 Posts

Posted - 03 Mar 2021 :  12:59:26 Show Profile Reply with Quote
[quote]Originally posted by andydeans3
X96.


For the future, what did you do to make it safe to cut the tank open?
Andy [quote]

Hi Andy, What my friend did was to drain and remove fuel tank then remove sender unit. Turned tank upside down and drained remaining fuel out of the sender hole. He then attached a wet-n-dry vaccum onto the large fuel inlet pipe and set to blow mode. He left it blowing through for around 20 minutes and then (with the blower still going) angle grinded/cut a hole in the top part of the tank. According to him, the lower explosive limit of vapour was deminished by using forced air from the blower and thus made it safe. The rest is covered in this post - http://saab-v4.co.uk/speedball/topic.asp?TOPIC_ID=2804





Edited by - chris steeden on 03 Mar 2021 13:06:22
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x96
V4 Fanatic

Spain
314 Posts

Posted - 04 Mar 2021 :  13:15:52 Show Profile Reply with Quote
quote:
[i]

For the future, what did you do to make it safe to cut the tank open?
Andy




Andy,for avoiding explosion I think it is enough to rinse several times the tank.
I left the tank full of vinegar and citric acid several days. But I notice it was not enough solution for complete cleaning. I had to use the metal scraper and grinder.
Then I rinsed with water and left the water hose flooding the tank for a while. Doing that, no one rest of petrol inside.
Then I cutted the bottom.
As you see on the pictures the bottom is in worse conditions than the top. Moreover the top part includes the cupper tube for ventilation attached in two points, this makes easier to cut the bottom.



Héctor

Edited by - x96 on 04 Mar 2021 13:27:59
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x96
V4 Fanatic

Spain
314 Posts

Posted - 04 Mar 2021 :  13:22:45 Show Profile Reply with Quote
quote:

Turned tank upside down and drained remaining fuel out of the sender hole.



On my tank I noticed it was going to be very difficult to drain completely the rest of the rust and dirty. it was in very bad conditions.

In any case I advice to leave the tank full of petrol for reducing the risk of rusting.

Héctor
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melle
V4 Guru

United Kingdom
3402 Posts

Posted - 04 Mar 2021 :  20:03:17 Show Profile Reply with Quote
The original tank in my 96 was leaking and full of crud when I got it. The one I replaced it with 12-13 years ago looks like it's electroplated inside. Last year when I replaced the level sender (which still doesn't work ) it still looked immaculate and it was clean as a whistle.

www.saabv4.com
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AnttiK
V4 Beginner

Finland
69 Posts

Posted - 05 Mar 2021 :  05:29:39 Show Profile Reply with Quote
The tank I installed fuel pump for injection was galvanized (or electroplated, which one of these the correct term?). There was no rust at all inside the tank. Original tank from year -73 was corroded, when I looked from level gauge sensor hole.

I think this rust free tank is probably from 1974-1976.
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