Anti-siphon valve?

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Llessur
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Anti-siphon valve?

#1 Post by Llessur » Tue Jul 17, 2018 5:49 am

Would a 1977 2500S fuel tank have an anti-siphon valve factory-fitted? I'm thinking a fuel transfer pump might be the cleanest and safest way of draining the 10+ year old fuel from my tank into a jerry can but don't want to buy one only to find I can't use it...
Adelaide, South Australia (ex-Brighton, UK)
1977 2500S - White

My 2500 blog: https://triumph2500blog.wordpress.com/

Charles H
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Re: Anti-siphon valve?

#2 Post by Charles H » Tue Jul 17, 2018 8:04 am

No, the filler goes straight into the tank. Easy to siphon.
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johnconradlee
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Re: Anti-siphon valve?

#3 Post by johnconradlee » Tue Jul 17, 2018 8:18 am

The easiest way I've fount to drain the tank is to break the fuel line at the rubber hose where it appears at the end of the gearbox tunnel, quickly (before you get too much fuel on the drive!) connect a length of rubber hose out under the car to a jerry can by the front wheel. That way it's all done by gravity and drains to the lowest point on the tank.
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Re: Anti-siphon valve?

#4 Post by johnnydog » Tue Jul 17, 2018 8:58 am

If you have good access under the car or it is on a ramp, then an alternative would be to disconnect the union on the underside of the tank above the diff. It is offset, so that access is reasonably good. The hole for the fuel to drain out of is then bigger than from any fuel lines, so the old fuel will come out quicker than a fuel pipe and any crud that might be in there has a better chance of escape. You can also pour another gallon in as quickly as the neck will allow to help remove any sediment from the tank. If you slacken the float on the side of the tank, without removing it fully, to allow the passage of air, it should allow any flushing fuel to be poured in quicker.
I have always drained Triumph tanks this way.
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Re: Anti-siphon valve?

#5 Post by Clifford Pope » Wed Jul 18, 2018 7:39 am

Remember a jerry can only holds 4.5 gallons. :)

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Re: Anti-siphon valve?

#6 Post by Llessur » Thu Jul 19, 2018 4:35 am

Cheers all, give me a some options for draining the not very petrolly petrol out of the tank :)
Adelaide, South Australia (ex-Brighton, UK)
1977 2500S - White

My 2500 blog: https://triumph2500blog.wordpress.com/

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