View single post by redracer

Posted: 02-14-2019 03:56 pm

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redracer

Joined:	09-10-2012
Location:	BROOKHAVEN, Georgia USA
Posts:	626
Status:	Offline

I'm not sure why all the confusion: earlier gas tanks only had 2 vent tubes where the pressure relief valve is screwed in, whereas the later tanks(I do NOT know what chassis # this started from, even though I looked through all my info)has 3 vents. This 3rd vent runs to the "T" in the diagram with the anti-siphon valve just before the "T". This had a clip on the hose to attach it to the highest part of the tank.
The valve itself is about the size of a 22 bullet; it is spring loaded to push a small ball inside it into the conical end when fuel pressure is turned on. After the engine is shut off the weak spring pushes the ball backwards to allow air in to prevent the siphoning.
I have never seen this "Technical Bulletin" even though I thought I had all of them and have never heard of "T.I.Royal"? Maybe he was the Australian branch? Here is a link to a cheap viable option on Amazon

https://www.amazon.com/attwood-Universal-Anti-Siphon-Valve-Fitting/dp/B00E21PVE8?th=1&psc=1