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Post by fishnfool on May 26, 2020 10:33:28 GMT -5
Has anyone replaced one of their anti syphon valves?
It looks like it would be easy.
If I have twins I assume I have two anti syphon valves?
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Post by finatic on May 26, 2020 11:32:25 GMT -5
Not yet, lead the way...
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Post by abouttime2fish on May 26, 2020 17:32:19 GMT -5
Huh. Where are those located and what makes you think they are bad?
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Post by fishnfool on May 26, 2020 18:25:27 GMT -5
Huh. Where are those located and what makes you think they are bad? They are located where your fuel lines connect to the fuel tank. My starboud motor is still acting up - intermittent bogging down at low RPMs (800 - 1100). I just replaced the injectors, fuel filters, including VST 3 yrs ago, plugs are only 2 or 3 yrs old, have swapped my speed idle controllers between motors, new fuel/water separators... it happens randomly, otherwise the motor runs like a top. The low pressure fuel pumps in these motors very rarely if ever go out. A bad anti syphon valve can cause fuel delivery issues but I think it tends to be at higher RPMs. Or it could be a v cuum leak in the fuel delivery system somewherem. At this point though I am just throwing parts at it. I really need to connect the motor to the YDS. I checked fuel lines today for cracks, lose connections and noticed there were two lines going to my low pressure fuel pump and one line seemed more off the nipple than the motor. I pushed it on better - if it were that easy! I did drive the boat after mostly at low RPMs and the motor didnt act up, so who knows... I have an appt to have an oil leak checked in my port motor, so will probably have him connect the starboard motor to the YDS and even do a link and sync.
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Post by finatic on May 26, 2020 18:32:17 GMT -5
Well that would be great if that line solves the issue at low speed. Intermittent issues are always the hardest to deal with.
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Post by fishnfool on May 26, 2020 18:35:28 GMT -5
Well that would be great if that line solves the issue at low speed. Intermittent issues are always the hardest to deal with. It's a real head scratcher. It started 2 yrs ago, I first noticed it while I was 50 miles offshore trolling. Motor feels like it's going to stall.
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Post by finatic on May 26, 2020 18:40:49 GMT -5
Wow you been chasing that for 2 yrs. What really sucks is if you take it to someone that motor will not act up. Would it show any computer code when plugged in by any chance, or does the computers on these motors only give you running history ?
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Post by fishnfool on May 26, 2020 18:43:52 GMT -5
Wow you been chasing that for 2 yrs. What really sucks is if you take it to someone that motor will not act up. Would it show any computer code when plugged in by any chance, or does the computers on these motors only give you running history ? I haven't spent a lot of time chasing it down until this year. That's when i did the injectors because I was certain it was going to solve it, NOPE. Then I thought it had to be the speed idle control valve, so swapped them to see if could duplicate the issue in the other motor, NOPE. Now I'm just determined to figure it out, I'm not going to let it beat me. Hahaha
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Post by abouttime2fish on May 26, 2020 19:17:47 GMT -5
I’m going for primer bulb for $100 Bob.....
Actually it’s a total SWAG but you seem to have covered everything else.
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Post by fishnfool on May 26, 2020 20:08:40 GMT -5
I bought a bulb today and only $34. I started to mess with it but the fuel line was on there pretty solid and I wasnt ready to commit.
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Post by chrissyt on May 27, 2020 6:04:01 GMT -5
Bought a brand new boat and had an intermittent fuel problem with one motor. Would starve for fuel every so often.Turned out the water separator filter was not tight enough and would suck air and lose its prime. Good luck, Rob
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Post by fishnfool on May 27, 2020 9:21:55 GMT -5
Bought a brand new boat and had an intermittent fuel problem with one motor. Would starve for fuel every so often.Turned out the water separator filter was not tight enough and would suck air and lose its prime. Good luck, Rob Yep it could end being something simple as a small leak somewhere. I'm crossing my fingers that the low pressure pump feeder line was the cause - wishful thinking I suspect. I'm going to put some fuel in the boat today so will see if the .motor will act up again
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Post by fishnfool on Aug 19, 2021 13:41:27 GMT -5
Wow you been chasing that for 2 yrs. What really sucks is if you take it to someone that motor will not act up. Would it show any computer code when plugged in by any chance, or does the computers on these motors only give you running history ? I haven't spent a lot of time chasing it down until this year. That's when i did the injectors because I was certain it was going to solve it, NOPE. Then I thought it had to be the speed idle control valve, so swapped them to see if could duplicate the issue in the other motor, NOPE. Now I'm just determined to figure it out, I'm not going to let it beat me. Hahaha Bringing this back up because Glen you were exactly right! I finally gave up and dropped it off with a Yammy mechanic this week so he could hook up the Yamaha Diagnostic software. Sure enough they idled around for an hour and the motor never missed a beat. Picked up the boat yesterday, tried cleaning the ISC valve, replaced my spark plug wires then went and got gas. Motors fired right up and ran really well, they even sounded different after cleaning the ISC valves on both motors so thought that might be it. Well as I was pulling back into my dock sure enough the sputtering came right back! GRRrrrrrr I am still not convinced that the ISC valve isn't causing a problem for my ECU. I'm going to order one and throw another part at the issue. They ain't cheap!
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Post by finatic on Aug 19, 2021 17:52:13 GMT -5
O buddy, I feel the pain and the hot head rush of aggravation. This season is one that needs to be forgotten. I hope you can resolve it.
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Post by gatorman on Aug 19, 2021 18:08:25 GMT -5
Could it be Hydra Locking? I had the same problem on a smaller 40hp Yamaha on a boat I have. It would bog after about 30min of running. I would turn it off let it sit and it would run fine for another 30-45min then bog again. I chased it throwing parts at it. Turned out it was the fuel pump inside the VST. Replaced the pump, problem solved.
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