Anti-siphon valve ?

[Lt_Nutz]

While trying to diagnose a fuel issue I removed the inspection plate on the deck to possibly replace the anti-siphon valve on the tank and cannot find it! There is a manual fuel shut off valve which I took out to clean but it is defiantly not an anti-siphon valve. Does a 2003 200 Osprey CC not have one? Looked everywhere else I could think of and cannot find it.

Picture attached.... ( I hope)

[gran398]

The second square pickup you have...remove the end plug and check inside the square portion. If there is nothing inside...you can eliminate restricted flow considerations from the tank, assuming the working one is the same as that one.

[gran398]

When you boys figure it out...post up for the benefit of all.

Thanks

[seabob4]

Obviously, the "anti-siphon" valve we are referring to is the spring loaded ball inside a more typical barbed fitting that threads into the square head on top of the pickup.  Since you have a shut-off valve threaded onto a nipple, there would be no spring loaded ball in there...

[Lt_Nutz]

Ok, for some reason my reply is stuck in my outbox.
No I never found an anti siphon valve. Just a manual shut off valve. I didn't pull the pickup out of the tank. Couldn't get the leverage to turn that fitting so I just pulled the manual valve, cleaned and reassembled. Posted on THT also and the concences seemed to be there wasn't one just the manual valve. Turns out my problem was the fuel pump. I replaced it and the engine is now running like a charm. It was about $390 at marine engine.com. What kind of engine do you have? Also did you check the fuel vent? Primer bulb?
Search THT for my post on the same topic. I am Bobsline on that forum.
I am on my cell. When I get home this afternoon I'll try to find it.
Bob

[Lt_Nutz]

Ok, for some reason my reply is stuck in my outbox.

That would be because whomever you replied to has not opened the PM on his computer.
Might be there forever. :|

I've had that happen...

No problem. lol He replied. I asked him to copy it to this thread for more/better input. i don't want to do it without his permission.

As to my reply
Greg,
My problem was as follows:  Engine started and idled fine. Ran at low RPM's ok. After 3000-3500 RPM's engine would start to stall out unless I pumped the primer bulb. Talked to a certified Evinrude/Johnson repair shop and did some research online (google is amazing!) Then tried the following solutions:
1. Checked the fuel vent which was under my gas cap as well. Yes it actually will draw air when the cap is tight. Diassembled cleaned and re-installed. Also tried running with the cap off. Problem continued.
2. Cleaned all filters which you have done.
3. I started with a fresh tank of gas so I skipped the new gas part. $$$
4. Replaced the primer bulb with another OEM Johnson bulb.
5. Disconnected fuel lines where possible and checked for restrictions.  No problems found.
6. Checked for anti-siphon valve issues which started this thread.  No AS valve. No issue.
7. Last test before replacing VRO Fuel pump: Is the engine getting oil???????? Is there noticeable change in oil tank level? Normal Oil smoke in exhaust? My oil warning light came on during my run back to the ramp pumping the primer bulb. I added a quart of 2-stroke oil directly to the gas tank to prevent damage to the engine. After trip I checked oil tank level and it had not changed one bit.  Another way to do this is to run the engine on a portable tank with premixes gas and run up the RPM's.

I then replaced the VRO Pump and the engine has been functioning normally ever since. Your problem sounds VERY similar except for the check engine light.  I hope this helps. Describe the problem you are having and I am sure you will get more and better suggestions on here.

[seabob4]

All gone!

Thanks, CB...didn't know I could delete something I sent...

[ioneyes]

Nutz, Thx for the follow up.  I did post this in my Anti-Syphon thread I do believe...anyway, my replies below.

Greg,
My problem was as follows: Engine started and idled fine. Ran at low RPM's ok. After 3000-3500 RPM's engine would start to stall out unless I pumped the primer bulb. Talked to a certified Evinrude/Johnson repair shop and did some research online (google is amazing!) Then tried the following solutions:
1. Checked the fuel vent which was under my gas cap as well. Yes it actually will draw air when the cap is tight. Diassembled cleaned and re-installed. Also tried running with the cap off. Problem continued.
I have looked here but haven't yet taken it apart as I was told that if when filling it doesn't back up then there is no blockage
2. Cleaned all filters which you have done.
Done
3. I started with a fresh tank of gas so I skipped the new gas part. $$$
4. Replaced the primer bulb with another OEM Johnson bulb.
Done
5. Disconnected fuel lines where possible and checked for restrictions. No problems found.
Again, same here but only where I could get at them.  I can see some wear on the lines under my round access hatch to the tank but I would have no idea how to get them out let alone change them
6. Checked for anti-siphon valve issues which started this thread. No AS valve. No issue.
I was told there is and anti-syphon valve in that ball valve assembly.  I can't look into that until I get a good low profile access hatch to replace that POS round one
7. Last test before replacing VRO Fuel pump: Is the engine getting oil???????? Is there noticeable change in oil tank level? Normal Oil smoke in exhaust? My oil warning light came on during my run back to the ramp pumping the primer bulb. I added a quart of 2-stroke oil directly to the gas tank to prevent damage to the engine. After trip I checked oil tank level and it had not changed one bit. Another way to do this is to run the engine on a portable tank with premixes gas and run up the RPM's.
My oil seems normal as it sucks it down like it always does.  Smokes the same and I never get an oil alarm.  I know this doesn't mean much.

I then replaced the VRO Pump and the engine has been functioning normally ever since. Your problem sounds VERY similar except for the check engine light. I hope this helps. Describe the problem you are having and I am sure you will get more and better suggestions on here.
My problem is at low idles not high rev's.  Boat runs the nutz (pun intended) once revved up.  Soon as I power down when pulling up to docks it starts giving me the check eng light with that ridiculously loud obnoxious beep and starts running as if it wants to stall. AND, it only does it sporadically. Very strange...that wouldn't seem VRO related to me...I still think it's restriction.  This is starting to look like a winter project.  One thing I noticed while looking around in my 02 johnson 175 OB.  The gas lines that go into the blocks before the carbs are very loose.  I can pull them off just by lightly pulling on them.  They are small lines, like 1/8" ID maybe...I was told by a johnson mechanic that that was how they were designed.  Just doesn't seem right.  I have never tried tie wrapping them...maybe I should to see what happens.  There is also a vacuum sensor up in the fuel pump that I'm going to replace. I'm also thinking about replacing the whole dang fuel pump.

Thx for the feedback and glad your back up and running!

[louiefl]

If you are having problems at idle and have carbs, check the low speed jets. The fuel / air ration needs to be as much as 1:8 at idle (versus closer to 1:12 at WOT), and the low speed circuit provides extra fuel to idle properly. It could be running lean at idle due to a plugged jet and then somehow triggering the alarm. On some carbs you can remove the low speed plate without dismantling the linkage and removing the entire carb.

[ioneyes]

Good info...thx!  I was planning to have all six carbs cleaned and adjusted this winter.  I have ran the johnson engine tune this summer and I always use seafoam when I fill up.