cliftyhanger
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| posted on 30/6/14 at 07:42 AM |
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Fuel resistant gaskets...
I need to make a gasket to fit an in-tank pump. (I don't want to weld/braze)
So I need to make a rubber gasket to suit. I was thinking 3mm Nitrile rubber, but it seems it isn't resistant to modern fuels?
Do i need viton? or is there an alternative. (I don't seem to be able to find any sealants etc that are suitable either)
Cheers all...
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FuryRebuild
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| posted on 30/6/14 at 10:15 AM |
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I'm looking at Viton - I was going to get it laser cut for my needs, but my cutters can only buy it in 5m lengths and it's amazingly
expensive. Ebay on the other hand has sample sizes at appropriate prices.
When all you have is a hammer, everything around you is a nail.
www.furyrebuild.co.uk
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Dingz
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| posted on 30/6/14 at 11:04 AM |
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Yes you will need Viton, and it is expensive. Could you use a viton O ring? it will probably be cheaper. I use one for the sierra fuel sender seal,
BS 332 59.69 x 5.33 What size sheet are you looking for?
Phoned the local ramblers club today, but the bloke who answered just
went on and on.
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cliftyhanger
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| posted on 30/6/14 at 11:16 AM |
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just under 200x200mm
Going to bolt a plate to the top of the (triumph) spitfire tank, and slot in a Golf IV pump. I don't trust my welding to be petrol leak free,
and brazing would be tricky to arrange.
My other vague hope is I am spending some time at CLM with an aircraft engineer. They have access to all sorts of interesting products....
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lewis
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| posted on 30/6/14 at 11:25 AM |
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I am a aircraft engineer & all the sealants I look through are not really suitable, PRC 1422 is used with jet A1 fuel but don't know how it
would react to unleaded fuel....maybe a experiment is needed.
I am a driving god!..........sort of
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Mr Whippy
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| posted on 30/6/14 at 12:01 PM |
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Well if you think about carbs they just use paper gaskets for the fuel chamber etc and you can buy sheets of that stuff Autosave has them, even cork
gaskets seem fine with fuel
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cliftyhanger
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| posted on 30/6/14 at 12:10 PM |
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It needs something to cope with uneven surface, hence 3mm thick.
I checked cork gasket stuff, and it all seems to say unsuitable for petrol. It is the ethanol content methinks that is causing havoc, and how long
before all the old gaskets start leaking? PITA if you ask me, but I want to be sure it is futureproof.
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owelly
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| posted on 30/6/14 at 12:57 PM |
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I have some of this:
http://www.jameswalker.biz/products/59-Nebar-reg-Brown
Any good to you?
http://www.ppcmag.co.uk
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cliftyhanger
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| posted on 30/6/14 at 02:00 PM |
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Thank you for the offer, but it looks like I would need the nebar blue (which is suitable for unleaded fuels)
Trouble is this is pretty confusing. Some say suitable for fuels , but specify a different version for unleaded. As above a PITA.
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Mr Whippy
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| posted on 30/6/14 at 02:09 PM |
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seeing that I run such old cars built before unleaded was even thought of I can't say I've seen any indication that hoses or gaskets are
breaking down any faster than normal. My landy has several old cork gaskets in the fuel system including the sender seal & fuel filter bowl and
all are just fine
It's like hardened valve seats, fixing a problem that doesn't even exist
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cliftyhanger
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| posted on 30/6/14 at 02:14 PM |
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My cars are mostly old. Ish. Well, 40+ years old.
the trouble seems to be that the actual quality of rubber varies hugely.
Some r6 rated fuel hose seems fine after several years, and other stuff marked up the same rating cracks up in a year.
But in this case I want to get it right, too much grief to fix later I reckon
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Paul Turner
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| posted on 30/6/14 at 02:46 PM |
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quote:
Originally posted by cliftyhanger
the trouble seems to be that the actual quality of rubber varies hugely.
Totally agree.
When I injected mine 10 years ago I used braided fuel injection hose from a National kit car parts supplier. Just after 4 years were up all the pipes
had cracked and hardened and fuel was pumping into the car as well as the engine. They offered free replacements, I declined.
I used hose that another kit car parts supplier confirmed was the right stuff but when I checked it after 3 years it was already starting to crack.
Replaced it with TFE hose from Think Automotive. Said to be suitable for all modern fuels, mates had it in his car for 10 years now with no issues.
Pig to fit, painful as well plus it costs a fortune. The unions also cost a fortune and I had to modify the swirl pot, filter and pump to suit the new
unions.
So its fingers crossed this time. 3rd time lucky (I hope).
Don't risk it, do it correctly and do it once. You do not want to be sitting a pool of petrol like I was.
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