anti syphon valve

[4.3 3rd time a charm]

Where is this valve exactly- is it on the actual fuel tanks? I cann not find one on my 30 gal inboard tank. What is it actual purpose?
Thanks

 

[Bt Doctur]

Re: anti syphon valve

It prevents gas from flowing freely from the tank in case a hose should break,
CG regs require a "positive shut-off" for the fuel. either anti-syphon or manual shut-off at the tank. It`s the first fitting on the tank feed.

 

[Fun Times]

Re: anti syphon valve

Where is this valve exactly- is it on the actual fuel tanks? I cann not find one on my 30 gal inboard tank. What is it actual purpose?
Thanks

There is the fitting that is screwed into the top of the fuel tank it's self, that is the fuel pick up tube fitting, then there is a hose barb fitting screwed in to the side of the fuel pick up tube fitting, That hose barb fitting is the anti syphon valve and that is where you would hook up the fuel line up to And That fitting has a spring ball valve on the inside of it And if the fuel get's old and sticky it will block the fuel from flowing thru.

 

[4.3 3rd time a charm]

Re: anti syphon valve

Thanks guys- I will check this out tomorrow-should I install a manual gas shut off valve in the feed gas line also?- just in case?

 

[JustJason]

Re: anti syphon valve

Up to you... But here's the thing....

If your fuel tank is below your fuel pump, you don't need a antisiphon or a shut off.
If your tank if above your fuel pump... then you need one.

 

[4.3 3rd time a charm]

Re: anti syphon valve

Hey thanks JustJason,
My pump is definately above the tank all right, so I will just throw the anti syphon valve away and install a flow through barb fititng.
I understand from the local Mercruiser boat shop that these valves are more trouble than they are worth. YES?
Is this legal to run without one than and safe.?

 

[Fun Times]

Re: anti syphon valve

Hey thanks JustJason,
My pump is definately above the tank all right, so I will just throw the anti syphon valve away and install a flow through barb fititng.
I understand from the local Mercruiser boat shop that these valves are more trouble than they are worth. YES?
Is this legal to run without one than and safe.?

No.

 

[JustJason]

Re: anti syphon valve

No.

Is there a CG reg i don't know about? I've been doing the whole over/under thing for years with no problems.

 

[Fun Times]

Re: anti syphon valve

:redface:

Is there a CG reg i don't know about? I've been doing the whole over/under thing for years with no problems.

That is just what I have been told for many years. So I go by that is all. I remember some one in the marine industry saying the CG want's it there, so in case there is a fire in the boat or engine, They consider it a safty valve to help keep the flame of the fire from reaching the in side of the gas tank so easy so it will not go BOOM so easy. And every time I ever talked to any of the boat manufacturer's they always said they half to by law. So I just went with that. But I want to tell you Jason sorry but I was wrong on saying no, I should have looked it up my self first, Before saying that. I guess I am just trying to bulid up my post counts to fast. Here is the CG link and Jason was right you might be able to do it as long as you can do what this link said to do.http://www.uscgboating.org/safety/boatbuilder/fuel/183-568.htm Good luck with it. And Jason that is another reason I like to come here is to learn new things also, And if I think I could help out that is fun to.Sorry about that.:redface:

 

[JustJason]

Re: anti syphon valve

Hey it's cool. I could have just as easily been wrong

When you have to go out 3 times in 1 season to replace the damm antisiphon valves on 1 boat you get pretty sick of them

So long story short to the OP... you don't NEED one. But if it makes you feel better put one in.