Anti Syphon Valve?

[ioneyes]

Hi Guys,

I have a 2003 215 Explorer with a 2002 Johnson J175PX 2 stroke outboard.  Once again I am getting a "Check Engine" light error (30-45 second long beep) occurring at low idle only.  Runs great when throttled up.  I know this means fuel restriction.  I have a new racor.  I also cleaned out the white cone shaped screen behind the fuel pump.  After a little research I see that some people are being told to check their anti syphon valve.  What is that and where would that be located on my boat?  What/Where else should I attempt to troubleshoot this problem.  I know I need to check all fuel lines for kinks, but what if one of the gas line in my engine (that I cannot see) has a pin hole in it? How would I be able to troubleshoot that?  Also, my primer bulb is horizontal.  Does it need to be mounted in a way that it is always verticle?
Next time out I need to check if the prime bulb is staying hard when this error occurs.  Any help would be greatly appreciated.

Greg

P.S.  This model Aquasport has a crappy design for the access hatch (10" flush round) ovewr the gas tank fuel lines and sending unit.  It is not centered over those components so i cannot get at them to work on them.

[Blue Agave]

The anti syphon value is located on the fuel tank. Another thing to consider is, are the fuel lines rated for ethonal use.

[ioneyes]

Update:  I knocked the ball bearing out of the anti syphon valve and I am still getting a check engine light and alarm.  All of the research I have been doing online everyone says their check engine light is coming on at high RPM's.  Mine is ONLY happening at idle or just in gear.  In the water I idle around 750 and in gear at 650.   The engine runs a little snotty the light comes on and the engine dies out.  If I get it going the check engine light goes away.  The boat runs great WOT.  

Do you think my idle is too low?  I was told that my idle for this engine should be around 1000rpm...seems a bit high to me.  My book states 750.  I've read that it could also be the vacuum switch and/or the pulse limiter fitting for the VRO pump.  Does this sound correct?  

Thanks in advance for any suggetions...Greg

[Circle Hooked]

The primer bulb also has a check valve in it and they do go bad, odds are in my opinion it's in the fuel line somewhere, and your rpms seem fine to me.