would a 2000 42 have anti siphon valves in the main and aux tanks ? thanks

No , they were building there own by then, absolutly not from the factory.

good to know, thanks alot

Wouldn't every tank have to have these valves to be USCG compliant, regardless of who/where they came from?

USCG rules require every fuel tank to have anti-siphon valves. My 1999 and 2007 Fountains both have them. They all have them.

GF?

well I checked a saddle tank, you cant pull the tube out all the way but managed to fish a cable down the tube all the way, with the pickup tube pulled out as far as I could and found no obstruction , just kept pushing the cable all the way through, and did the same on a main tank ?

Did you remove the hose barb on top the tanks to do this check?

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 . one of the main tanks I did the same thing with the cable and I could stuff 2 + feet of it through the tube , thanks for the response .

You may be right about CG regulation. But you may be allowed if fuel system have a shut off valve Im not sure, the CG gave the approval for them to put a build certification stickers on the tank , fill, vent, and pick-up assembly and there was not an anti- syphon valve

Ok what does a anti siphon valve look like, I am sure that you could not put a 1/16 cable throuh it ?