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i love boats
United Kingdom
51 Posts |
 Posted - 01 Jun 2011 : 12:01:49
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| Hi everyone, I have recently bought a plastic 6 gallon petrol tank for my Norman 20 (will need a mortgage to fill it) i want to fit a new outlet that screws in on a taper thread.I didn't want to screw it in dry as petrol has a way of finding a way out so i rang loctite who told me they didn't have any thread sealer which was ok, a bit hard to belive so i researched ptfe tape which had conflicting advise. Can any one advise me on any thread seal which will be ok. Many thanks Dave. |
Edited by - i love boats on 02 Jun 2011 10:57:00 |
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Ricky
100 Posts |
Posted - 01 Jun 2011 : 18:11:21
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Hi
A couple of posts down I posted about my fuel can/connector issue. As Cliveshep points out, you can do a bodge but will it please the BSC man?
Cheers Rick |
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Knighty
United Kingdom
654 Posts |
Posted - 01 Jun 2011 : 19:52:32
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Pretty sure on my last tank and new one supplied with my outboard they just screw in hand tight dry. As long as the thread is on top of the tank and you shouldn't brim the tank it shouldn't be a problem. The cap should have a breather hole or you slightly loosen the cap when running anyway.
If you did want to seal it cannot see ptfe being a problem as it's not as if it's under pressure at top of the tank.
This is all assuming the fitting you are on about is the one with a dip pipe to the bottom of the tank. |
Edited by - Knighty on 01 Jun 2011 19:55:12 |
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Boatmad
United Kingdom
1092 Posts |
Posted - 02 Jun 2011 : 20:46:21
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Sorry guys the fuel tank will pressurise if the engine is stopped and the vent closed due to evapouration of the fuel, this builds up to a few pounds per sq inch after a couple of hours on a warm day. If you want to interchange tanks use quick release couplings properly sealed using ptf tape or hylomar sealant on the threads.
pagreenwell |
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i love boats
United Kingdom
51 Posts |
Posted - 03 Jun 2011 : 16:01:15
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| hi Peter.did think about hylomar and ptfe but correct me if im wrong but both degrade in contact with petrol. im propably being a bit over cautious but i dont want any leaks sitting in the bilge. Dave. |
Edited by - i love boats on 03 Jun 2011 19:33:40 |
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cliveshep
Thailand
1324 Posts |
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i love boats
United Kingdom
51 Posts |
Posted - 04 Jun 2011 : 22:03:13
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| Hi Clive, Thanks for the links.I have used hylomar in the past for gasket cement but never thought it would be ok for petrol pipes etc. will be getting a tube tomorrow. many thanks. Dave. |
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Revolvor
United Kingdom
75 Posts |
Posted - 05 Jun 2011 : 10:19:30
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I have used a Loctite product for this - Loctite 577
www.loctite.sg/sea/content_data/93780_577EN.pdf
Quite expensive, but fully compatible with hydrocarbons - see table on page 2.
Regards, John |
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i love boats
United Kingdom
51 Posts |
Posted - 05 Jun 2011 : 10:58:21
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| Hi John. I rang the loctite help line who said they didnt have anything that would be ok, not much point having a helpline if they dont know their products. Thanks Dave |
Edited by - i love boats on 05 Jun 2011 10:59:11 |
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Revolvor
United Kingdom
75 Posts |
Posted - 05 Jun 2011 : 12:57:53
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Our Company uses it to seal hydraulic connections on sub-sea actuators, at 5000 psi, 3km water depth and guaranteed for 30 years so it has to work!
John |
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outlet connection to tank
