removing anti-siphon valve for good?

[brunolund]

''''''''''''''96 lund tyee, 4.3lx merc.
i was told today by a merc dealer mech., that he doesn't replace the anti siphon vave, he just punches it out of the fitting and run s without one. is this normal? in didn't think it would be good for the electric fuel pump?he also said something abouty it being illegaal in the us, but not here in canada. any ideas and thouights?

 

[mpdive]

Re: removing anti-siphon valve for good?

That's one mechanic I would not be going to. Should you ever blow a fuel line, you will be pumping your bilge full of raw fuel. Needless to say it's an explosion waiting to happen. For the small cost of a valve, why would you even take that kind of chance? Backyard, appletree mechanic...

 

[Raystownboater]

Re: removing anti-siphon valve for good?

I had a Certified Mercruiser mechanic tell me that the first thing he does when tracing a fuel issue is to punch out the anti siphon valve. I'm not sure how removing that valve would cause fuel to pump into your bilge, if you blew a fuel line, though.

 

[mpdive]

Re: removing anti-siphon valve for good?

The anti siphon valves purpose is to open when suction is applied from the pump. If suction is lost (aka-broken fuel line) the spring pressure closes the valve so no fuel can be funneled from the tank. It's there for a reason. They may punch them out to test them but I'll guarantee they replace them after diagnoses. I can see the headline now "Family of 5 burnt up in boat due to negligent marina"

 

[joewithaboat]

Re: removing anti-siphon valve for good?

I agree its there for a reason. If it is working properly it belongs there. I was on an older boat (without one) that burned to the waterline and sank. Six people swam for their lives when the fire extinguisher proved to be too small. Not a fun experience! Replace it.

 

[mpdive]

Re: removing anti-siphon valve for good?

I agree its there for a reason. If it is working properly it belongs there. I was on an older boat (without one) that burned to the waterline and sank. Six people swam for their lives when the fire extinguisher proved to be too small. Not a fun experience! Replace it.

More reason why I prefer to do my own work. I don't have to worry about becoming a roman candle...

 

[joewithaboat]

Re: removing anti-siphon valve for good?

Our past experiences groom us. That?s why I have a larger than normal fire ext. and a Pelican case for all of the wallets, keys,jewelry, phones and other hard to do without items. As soon as we set foot on the boat it gets filled up.

Sorry to the o/p for getting off course.

 

[mpdive]

Re: removing anti-siphon valve for good?

Those are all great ideas. Better than the addage of "it won't happen to me'

 

[stonyloam]

Re: removing anti-siphon valve for good?

I'm not sure how removing that valve would cause fuel to pump into your bilge, if you blew a fuel line, though.

On your fuel tank you have a tube that goes to the bottom of the tank with a anti siphon valve on top. The flex line attaches to the barb of the valve. Situation: No (or punched out) anti-siphon valve. The tank is full. The path of the flex line from the tank to the fuel pump runs along the hull below the level of the fuel in the tank. If the line is cut at a point where it is below the level of the fuel in the tank it will siphon the fuel out of the tank into the bilge. Result gallons of fuel in bilge. With the anti-siphon valve in place, if the line is cut the fuel in the line may leak out but since the valve prevents fuel from flowing out of the tank air will enter the line and break the siphon. Result an ounce or two of fuel in the bilge.

 

[mpdive]

Re: removing anti-siphon valve for good?

On your fuel tank you have a tube that goes to the bottom of the tank with a anti siphon valve on top. The flex line attaches to the barb of the valve. Situation: No (or punched out) anti-siphon valve. The tank is full. The path of the flex line from the tank to the fuel pump runs along the hull below the level of the fuel in the tank. If the line is cut at a point where it is below the level of the fuel in the tank it will siphon the fuel out of the tank into the bilge. Result gallons of fuel in bilge. With the anti-siphon valve in place, if the line is cut the fuel in the line may leak out but since the valve prevents fuel from flowing out of the tank air will enter the line and break the siphon. Result an ounce or two of fuel in the bilge.

Good in depth explanation

 

[jmarty10]

Re: removing anti-siphon valve for good?

They dont have them in cars because fuel spills on the street. In boats it accumulates in the bilge.

 

[a1nowell]

Re: removing anti-siphon valve for good?

OK, Help me joewithaboat what is a ,"pelican case." Sounds like a good idea.

 

[AZSenza]

Re: removing anti-siphon valve for good?

Pelican Case=Plastic case in various sizes with a rubber gasket around the lid for water tight safety. GREAT place for keys, wallet, insurance card, registration etc...

 

[joewithaboat]

Re: removing anti-siphon valve for good?

I have this one, thinking of getting another to keep hand tools super dry. They seal great!
I have tested it well loaded and it floats great. Not sure if it would if filled to the top with tools?

http://www.academy.com/webapp/wcs/s..._10151_10051_13045_-1?Ntt=peican+case&Ntk=All

 

[acousticmark]

My asv is stuck as ...well you know. I can't get it off even used impact and break away lube. Any suggestions? I'm afraid it's gonna snap the fitting that is attached to the plastic gas tank. It's righty tighty, lefty loosie isn't it?