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T: Fuel Tank Best sealant

kettlrj

Well Known and Active Website User
VOC Member
Can anyone recommend a fuel tank sealant that they have used and had good results with.
Regards Richard
 

Chris Launders

Well Known and Active Website User
VOC Member
I used one somewhere around 15 years ago on two tanks that have been in use ever since and it has been perfect, I have tried several others since with several failures, the problem is the people who I got the original from are no longer trading but if you can find out where they got it from I would be eternally grateful, it was "Flexible tank sealant from Merlin Classic Motorcycles" and I believe was an aircraft spec sealant.
 

Vincent Brake

Well Known and Active Website User
VOC Member
Richard,
Apart from the brand..
(Many will follow i presume)

Its ESSENTIAL to clean inside.
Better than asked for.
One spot with bad adhesion,
Will come loose in the end.

Causing the 1000% good material to fail.
 

peter holmes

Well Known and Active Website User
VOC Member
I cannot really understand the need for fuel tank sealant, surely if you have a fuel tank leak you get it fixed, if you have rust or debris in the tank you clean it out as best you can and then put an inline fuel filter on the fuel pipe. I have never treated a Vincent tank with sealant in 55 years, I did once have a Tank weep fuel (long before ethanol) it must have had a poor weld around the steering column recess, once I had got rid of the fumes I had it welded and it never leaked again.
 

macvette

Well Known and Active Website User
VOC Member
Can anyone recommend a fuel tank sealant that they have used and had good results with.
Regards Richard
I have used POR 15 sealant on all of my tanks two of which are are 1930s vintage and had no issues in aver 10 years.
None of my tanks had leaks so the sealant was only applied to prevent corrosion. I chose it because of work experience in the petroleum industry and because petrol in the US contained ethanol some years before Europe so unlike some other products here it has a proven record.
As Vincent Brake says, its essential to prepare the tanks scrupulously. This sealant kit ( as do others) comes with a surface etching solution which dissolves rust so if there are pinholes about to break through ie mainly sealed by rust, there is the potential for the tank the leak.
To avoid this, I perfer to first degrease the tank thoroughly and get rid of any rust electrolitically before using the sealant as directed.
Some years ago I posted pics of the method but if you Google it you will find good write ups of it. It is slow but has the advantage of converting rust to iron at a molecuar level so unlike an acid etch, does not remove material and reaches all parts of the tank. You would be surprised how much rust come off what looks like a relatively lightly corroded tank.
 

brian gains

Well Known and Active Website User
VOC Member
I cannot really understand the need for fuel tank sealant, surely if you have a fuel tank leak you get it fixed, if you have rust or debris in the tank you clean it out as best you can and then put an inline fuel filter on the fuel pipe. I have never treated a Vincent tank with sealant in 55 years, I did once have a Tank weep fuel (long before ethanol) it must have had a poor weld around the steering column recess, once I had got rid of the fumes I had it welded and it never leaked again.
once a tank has leaked and the pinhole(s) been repaired I would suggest it prudent to thoroughly clean/scour inside the tank and apply a credible sealer to mitigate against further pinhole leaks that will no doubt follow in time. An in line filter is a sticking plaster for an on going problem, apart from that they are fugly. The only instance in which they are justified is where bad fills are common place.
 

genedn

Well Known and Active Website User
VOC Member
I have used for Por-15 with good results. My preference is to descale the tank and then have it acid dipped. Then run the fuel tank clean and follow regular winter procedures.
 

Chris Launders

Well Known and Active Website User
VOC Member
I cannot really understand the need for fuel tank sealant, surely if you have a fuel tank leak you get it fixed, if you have rust or debris in the tank you clean it out as best you can and then put an inline fuel filter on the fuel pipe. I have never treated a Vincent tank with sealant in 55 years, I did once have a Tank weep fuel (long before ethanol) it must have had a poor weld around the steering column recess, once I had got rid of the fumes I had it welded and it never leaked again.
Peter you are quite right but there are situations where it's is not really practicable, one of mine that I used sealer in is a genuine Manx tank that had become porous on some of the welds, without cutting the entire tank open it would have been impossible, another is a Brough Superior tank which are soldered tin sheet, too far gone to be plated and again the only way to be able to use it other than completely dismember it, and probably have to make a copy, is a sealer.
 

vibrac

Well Known and Active Website User
VOC Member
I seem to remember there was a thread on the forum as macvette said about an electrolitically based system for de rusting the tank. I need to have a clue to search by. The wonderful " electrolitically" gets me nowhere and "tank" does rather get a bit crowded:rolleyes:
 

vibrac

Well Known and Active Website User
VOC Member
Well I tried it for a day and I have just taken it off. The inside is as black as if it was powder coated I cant belive the corrosion on the + anode(diode?) easy with an old battery charger and a battery in series hardest part is finding Soda crystals plenty of them about but all dressed up in fancy names and prices,drain unblocker, wonder cleaner etc etc and who knows what else they have with them . Amazingly I found the base product as cheap as chips where I never go Tesco!
Now to dry it out and get some Slosh coated inside
 

macvette

Well Known and Active Website User
VOC Member
Well I tried it for a day and I have just taken it off. The inside is as black as if it was powder coated I cant belive the corrosion on the + anode(diode?) easy with an old battery charger and a battery in series hardest part is finding Soda crystals plenty of them about but all dressed up in fancy names and prices,drain unblocker, wonder cleaner etc etc and who knows what else they have with them . Amazingly I found the base product as cheap as chips where I never go Tesco!
Now to dry it out and get some Slosh coated inside
You should be using bicarbonate of soda not soda crystals. Bicarbonate is baking soda.
 

vibrac

Well Known and Active Website User
VOC Member
bicarb is an alternative here is the original source from the rusty tank thread link
"iron electrode, water and washing soda (Arm & Hammer, for example) and a battery charger. About a tablespoon of soda to a gallon of water. If you have trouble locating the washing soda, others have reported success with baking soda."
I used 3 table spoons in 3 odd gallons that the tank held all I know is its a smashing job and after rinsing in cold water the tank surface rust is converted as If I had powder coated it. its sitting in the sun now making sure its all dry before the lining
 

vibrac

Well Known and Active Website User
VOC Member
It does look as if its a handy alternative (or indeed is) chemical blacking, I shall try it on a jam jar and some rusty bolts (God knows i am not short of those!)
 

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