Do I have anti siphon valves?

[JJDebeers]

1977 Silverton 31 with twin 318s.

I don't think I have anti siphon valves. When inspecting the the fuel lines last weekend I didn't see any evidence of AS valves. But, the more posts I read it seems like a lot of guys have them located at the top of the fuel tank directly after the pickup tubes.

I don't have pictures right now, so bare with me...

My fuel tank has the typical threaded bungs on top, with what appears to be a brass reducer fittings screwed in. I'm assuming this reducer fitting is brazed to the actual pickup tube.

Then, there are standard 90 degree brass elbow screwed into the reducer fittings, then copper line to the water separator housings, etc etc..

Is the brass reducer fitting between the tank bung, and 90 degree elbow the pickup tube? Are the pickup tubes typically brazed to a fitting like this?

Thanks,
-JJ

 

[JJDebeers]

So this isn't my picture, but my setup looks similar. Except it doesn't have the valve (circled).

Is the fitting (arrow) connected to the pickup tube?

-JJ

 

[Trojanman]

An anti-syphon valve basically looks like a hose barb like this one..

 

[bobv]

It could also be threaded on both ends. Anti siphon valves are required by coast guard!
Bob

 

[JJDebeers]

It could also be threaded on both ends. Anti siphon valves are required by coast guard!
Bob

Not in every situation. Take a look at the requirements.

-JJ