speedyxjs
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| posted on 30/9/09 at 03:10 PM |
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Pressure release filler cap?
I was playing with the cooling system yesterday and got thinking, can you get a pressure release filler cap for the fuel tank like you do with the
coolant resevior?
This would save me needing to play with extra fuel lines 
How long can i resist the temptation to drop a V8 in?
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Staple balls
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| posted on 30/9/09 at 03:15 PM |
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Aren't most caps vented anyway?
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adithorp
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| posted on 30/9/09 at 03:20 PM |
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Why would you want your fuel tank to be pressurised?
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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speedyxjs
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| posted on 30/9/09 at 03:29 PM |
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quote:
Originally posted by adithorp
Why would you want your fuel tank to be pressurised?
You dont. Thats why you need a way for the vapours to get out/air to get back in.
How long can i resist the temptation to drop a V8 in?
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l0rd
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| posted on 30/9/09 at 03:31 PM |
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Isn't this why you have those one way valves?
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blakep82
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| posted on 30/9/09 at 03:51 PM |
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quote:
Originally posted by l0rd
Isn't this why you have those one way valves?
yeah, but i see what he's saying, it would be nice if that was built into the cap, rather than having seperate tank connections, valves and
pipes
________________________
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don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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speedyxjs
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| posted on 30/9/09 at 03:56 PM |
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Just found this that says it is vented. Any good?
How long can i resist the temptation to drop a V8 in?
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adithorp
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| posted on 30/9/09 at 04:06 PM |
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quote:
Originally posted by speedyxjs
quote:
Originally posted by adithorp
Why would you want your fuel tank to be pressurised?
You dont. Thats why you need a way for the vapours to get out/air to get back in.
But you were comparing it to a radiator presure cap, that holds presure up to a set level (say 15psi) and then releases anything over that giving a
presurised system.
With a fuel tank you want a vented system, so you need either a vented cap (prone to leaking) or a breather system.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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speedyxjs
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| posted on 30/9/09 at 04:08 PM |
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quote:
Originally posted by adithorp
quote:
Originally posted by speedyxjs
quote:
Originally posted by adithorp
Why would you want your fuel tank to be pressurised?
You dont. Thats why you need a way for the vapours to get out/air to get back in.
But you were comparing it to a radiator presure cap, that holds presure up to a set level (say 15psi) and then releases anything over that giving a
presurised system.
With a fuel tank you want a vented system, so you need either a vented cap (prone to leaking) or a breather system.
How could a vented cap leak?
How long can i resist the temptation to drop a V8 in?
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adithorp
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| posted on 30/9/09 at 06:34 PM |
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Vented caps basically just have a small hole to let gas in/out; no valve.
Fill the tank close to the top on a hot day. Fuel comes out of the underground tank at 15'c and then warms up and expands and out it'll
come. Or just corner hard with a full tank and a filler thats not far above the tank and you'll find out why early Metro's were recalled
for new caps after the Police crashed a few (fuel leaked onto the o/s rear wheel). Whereas with a breather with 2 way valve it'll seal.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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speedyxjs
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| posted on 30/9/09 at 06:59 PM |
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^^^ Thanks
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