anti siphon valves
01-31-2011 | 11:54 AM
#11
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Joined: Feb 2005
Posts: 2,551
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From: long island, newyork
on the larger powered boats they usually are a 2-3"long brass piece with a 1/2 pipe thread femalex female. in the centerthere will be a small piston shaped plug that is forced closed by a thin spring. if you look thru it and see light its been removed. the smaller are a hose barb x 1/2 r 3/8 pipe and have a small ballbearing sized/ looking ball also hels shut by a thin spring.
01-31-2011 | 05:41 PM
#12
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Joined: Aug 2006
Posts: 2,461
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From: Ontario, OH
The hose fitting you pulled off should be the anti-siphon valve. If it isn't, then you don't have them.
I removed the fuel suction hose , hose fitting, so I could have room to turn the fuel 90 degree pickup and pull it out as far as I could , 8 to 10 inches or so and then fished a fine cable down the tube and it kept on going deep into the tank ,this boot was built from the factory with 750 griffin blower motors so I am thinking the valves were never installed.
01-31-2011 | 07:42 PM
#13
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Joined: Jan 2005
Posts: 145
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From: Tappahannock, VA
Most were built without anti-siphon valves. There was a "campaign" to install them on the saddle tanks of either 42 or 47 (I don't remember which) in 2006. This "campaign" was mandated by the CG, after they found no anti-siphon valves on these tanks (I guess they never checked any other tanks or models). That having been said...I would NOT install them on my fuel tank. They can cause fuel starvation (lean your motor), or just stop the fuel flow all together, and ruin your weekend. That is my opinion and experience, with both outboards and sterndrives.
