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Blocked fuel tank
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JC T ONE



Joined: 30 Oct 2008
Posts: 1113
Location: Denmark

PostPosted: Fri Sep 19, 2014 7:18 pm    Post subject: Blocked fuel tank Reply with quote

Hi all,

I have bought a car thats been standing for 31 years.

The old petrol have turned into oil again, and hardened up Sad

Tried to pour some fresh petrol into the tank, but after days of waiting = nothing Rolling Eyes

So what do I use to attack this with ? Coca Cola ?

good weekend to all
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kevin2306



Joined: 01 Jul 2013
Posts: 1331
Location: nr Llangollen, north wales

PostPosted: Fri Sep 19, 2014 8:43 pm    Post subject: Reply with quote

This

http://www.frost.co.uk/cleaner-degreaser-por15-marine-clean.html

Buy the large size and soak with very hot water.
I used it on an old motorcycle tank that had a lot of black petrol gunk (like black thick tar). I insulated the tank before filling it with the solution to keep the temps up for longer...came up like new.

Kev
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JC T ONE



Joined: 30 Oct 2008
Posts: 1113
Location: Denmark

PostPosted: Sat Sep 20, 2014 2:26 am    Post subject: Reply with quote

kevin2306 wrote:
This

http://www.frost.co.uk/cleaner-degreaser-por15-marine-clean.html

Buy the large size and soak with very hot water.
I used it on an old motorcycle tank that had a lot of black petrol gunk (like black thick tar). I insulated the tank before filling it with the solution to keep the temps up for longer...came up like new.

Kev



Hi Kev,

not sure this will do it ? its like concrete = rock hard, never seen anything like it Question
The tank did have petrol in it from 3 years ago, when an attempt to start the car was made, and even thou this petrol has been soaking the 28 years old remains it had NO impact / effect what so ever.

think I need some kind of acid for this job ? maybe flush the tank with water, and then heat it with a gas burner from underneath ?
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COMMAD



Joined: 12 Dec 2011
Posts: 161
Location: Gold Coast. Australia

PostPosted: Sat Sep 20, 2014 4:03 am    Post subject: Reply with quote

Rolling Eyes Rolling Eyes HEAT!!!!! You might blow your head off, Think again, be WARNED!!!!!! Twisted Evil Evil or Very Mad
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ukdave2002



Joined: 23 Nov 2007
Posts: 3470
Location: South Cheshire

PostPosted: Sat Sep 20, 2014 7:32 am    Post subject: Reply with quote

I used some cheap "gun wash" thinners on a wacker plate tank, it had stood half full for about 10 years and gone solid. It seemed to dissolve all the solid contents.

Thinking back to schoolboy chemistry..... what you have is some form of oxidised hydrocarbon, so it should be able to be broken down by water or alcohol?

Dave
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Old Wrench



Joined: 23 Dec 2013
Posts: 226
Location: Essex and France

PostPosted: Sat Sep 20, 2014 8:37 am    Post subject: Reply with quote

Try this:

http://www.starbrite.com/item/star-tron-tank-cleaner

To add to this thread:

Table 1. Composition by hydrocarbon
type of typical automotive gasolines


Composition Range


Alkanes
Alkenes
Isoalkanes
Cycloalkanes
Cycloalkenes
Total aromatics
Benzene
Paraffins (naphthenes)
Olefins
Aromatics

Reference Source here:

http://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CCgQFjAB&url=http%3A%2F%2Fmonographs.iarc.fr%2FENG%2FMonographs%2Fvol45%2Fmono45-8.pdf&ei=ykAdVKDBKsHd7QbdzoHQCw&usg=AFQjCNFTUCqrWvQi4agSsAKJSv819uACuA&bvm=bv.75775273,d.ZGU

Therefore, you must seek solvents to remove all hard deposits.
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Peter_L



Joined: 10 Apr 2008
Posts: 2268
Location: New Brunswick. Canada.

PostPosted: Sat Sep 20, 2014 10:38 am    Post subject: Reply with quote

Perhaps consider cutting away a large area on top of the tank to allow mechanical access to remove the majority of the crud, then chemical clean, steam clean and then weld the piece back in. Pretty it up and paint.
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kevin2306



Joined: 01 Jul 2013
Posts: 1331
Location: nr Llangollen, north wales

PostPosted: Sat Sep 20, 2014 1:16 pm    Post subject: Reply with quote

JC T ONE wrote:
kevin2306 wrote:
This

http://www.frost.co.uk/cleaner-degreaser-por15-marine-clean.html

Buy the large size and soak with very hot water.
I used it on an old motorcycle tank that had a lot of black petrol gunk (like black thick tar). I insulated the tank before filling it with the solution to keep the temps up for longer...came up like new.

Kev



Hi Kev,

not sure this will do it ? its like concrete = rock hard, never seen anything like it Question
The tank did have petrol in it from 3 years ago, when an attempt to start the car was made, and even thou this petrol has been soaking the 28 years old remains it had NO impact / effect what so ever.

think I need some kind of acid for this job ? maybe flush the tank with water, and then heat it with a gas burner from underneath ?


Worked for me on the residue left in a tank that had stood for over 25 years. inside came up like a new one, its pretty awesome stuff.

Kev
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ukdave2002



Joined: 23 Nov 2007
Posts: 3470
Location: South Cheshire

PostPosted: Sat Sep 20, 2014 6:01 pm    Post subject: Reply with quote

The more I think about this I think water is the answer. Put hot water into the tank if you have a way of keeping the tank hot without naked flames, great, see if it starts to disolve the solid stuff...it may take a few flushes.

Cheers

Dave
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colwyn500



Joined: 21 Oct 2012
Posts: 1740
Location: Nairn, Scotland

PostPosted: Sat Sep 20, 2014 6:07 pm    Post subject: Reply with quote

I used hot water, phosphoric acid, waterbased degreaser and a few old nuts, bolts and washers which I gently agitated every so often.........and lots of patience.
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JC T ONE



Joined: 30 Oct 2008
Posts: 1113
Location: Denmark

PostPosted: Sat Sep 20, 2014 6:09 pm    Post subject: Reply with quote

Hi all & thanks for all your good advice Smile will try some of them (wont cut the tank) and report back.
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JC T ONE



Joined: 30 Oct 2008
Posts: 1113
Location: Denmark

PostPosted: Wed Oct 08, 2014 5:51 pm    Post subject: Reply with quote

Hi all,

thanks for all your advice , tank is now "open" again.

After it had been soaking, i drained it again, and put a light inside the tank, here i could see the pipe & the metal mesh filter on the end.

all looked OK, so I put a thin piece of metal wire into the out line pipe.
It would only go halfway up/in.
I then took a old wire from a bike wheel, and hammered one end flat, and grinded the end like a drill, then fitted it into my drill, and went for it.
A lot of rusty dust came out, but still no clear passage.
I then filled the pipe with alcohol, and left it over night.
Next day the alcohol was absorbed, so I then filled it with diesel, and next day this was also gone.
Then it was time for another go, with the airgun & compressor. I had a friend holding the hose on to the pipe, as I managed the airgun, after a few seconds it cleared.
We then fitted the hose to the tank, and poured 4 liters of diesel in.
When the diesel went into the pipe, and started coming out the hose, we put a bolt into it, this way I was sure to have diesel inside the outline pipe.
I then put 25 different size nuts into the tank, and shook it around.
This was done for the next week, several times when I was in the workshop.
Then the tank was drained, and flushed with petrol.
Some areas do have a little rust on them, should I do something about this? or ?




Here is a link =
http://www.oldclassiccar.co.uk/forum/phpbb/phpBB2/viewtopic.php?t=16456&highlight=



Jens Christian
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colwyn500



Joined: 21 Oct 2012
Posts: 1740
Location: Nairn, Scotland

PostPosted: Wed Oct 08, 2014 6:14 pm    Post subject: Reply with quote

Jens, I think I used this and it also fixed lots of pinholes and areas where I had filled big holes with epoxy. Full instructions there but I got rust neutralised with phosphoric acid solution.
http://www.rust.co.uk/0002-slosh-ethanol-resistant-petrol-tank-seal/p405062/
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JC T ONE



Joined: 30 Oct 2008
Posts: 1113
Location: Denmark

PostPosted: Thu Oct 09, 2014 6:27 pm    Post subject: Reply with quote

colwyn500 wrote:
Jens, I think I used this and it also fixed lots of pinholes and areas where I had filled big holes with epoxy. Full instructions there but I got rust neutralised with phosphoric acid solution.
http://www.rust.co.uk/0002-slosh-ethanol-resistant-petrol-tank-seal/p405062/



Thanks for that link Smile they seem to have some very good products Cool
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