Pabel1993 Posted May 18, 2020 Report Share Posted May 18, 2020 Need some help I have a Yamaha 250 sho on my 2300 and it seems to be starved for fuel. The boat will idle all day long with no problems whatsoever and I can rev it up in neutral and not starve out. But it seems that once I try to get on plane it’ll start spitting and sputtering and shut off. The only way I can get it to come back on at this point is to re prime the motor. It was doing this a few months ago but would kinda clear its self up after a few times, but now I can’t even get a 100 yards. I’ve replaced both fuel filters , and the primer ball, but are kinda stuck on where to look next. Any help would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
HoneyB Posted May 18, 2020 Report Share Posted May 18, 2020 Did you check your fuel quality? I know that sounds way to simple. But it would be the only thing I would know to check. Quote Link to comment Share on other sites More sharing options...
Pabel1993 Posted May 18, 2020 Author Report Share Posted May 18, 2020 4 minutes ago, HoneyB said: Did you check your fuel quality? I know that sounds way to simple. But it would be the only thing I would know to check. Yea Sure have. It does seem to do it when I have less fuel in the tank too Quote Link to comment Share on other sites More sharing options...
Pabel1993 Posted May 18, 2020 Author Report Share Posted May 18, 2020 Also does anyone know what sending unit is in a pathfinder 2300 and how to remove that stupid vapor filter on my tank because now I can’t even fill up my boat without it taking 30 minutes Quote Link to comment Share on other sites More sharing options...
Bamaskeet Posted May 18, 2020 Report Share Posted May 18, 2020 Have you replaced the vst filters? Quote Link to comment Share on other sites More sharing options...
Pabel1993 Posted May 18, 2020 Author Report Share Posted May 18, 2020 17 minutes ago, Bamaskeet said: Have you replaced the vst filters? I’m going to do that today and see what happens along with the sending unit and anti siphon valve Quote Link to comment Share on other sites More sharing options...
Capt. Troy Posted May 18, 2020 Report Share Posted May 18, 2020 Make sure your tank is venting properly. If the engine starts staving for fuel stop and crack open the fuel fill and listen for suction. Quote Link to comment Share on other sites More sharing options...
jh141 Posted May 18, 2020 Report Share Posted May 18, 2020 Get Rid of the Anti Siphon. My SHO was doing the same thing, but not as bad. Removed the anti siphon and it seems to have cleared up. Had already replaced primer bulb twice. As a side note there is a drain on the bottom on the vst tank with a hose attached. You can drain it and check for fuel. I removed the anti siphon fitting. I took a 3/8 drill bit and drilled out a 1/4 inch on the side with threads, that allows the ball to come out. I pulled the spring out, cleaned everything up and reinstalled the fitting. My primer bulb now pumps up easier and the starving out until I pump the bulb has disappeared. I believe the anti siphon valve and the primer bulb check valve were creating an air lock between them some how. According to USCG regulations, unless your motor is lower that your fuel tank you are not required to have the anti siphon valve. Quote Link to comment Share on other sites More sharing options...
Pabel1993 Posted May 18, 2020 Author Report Share Posted May 18, 2020 43 minutes ago, jh141 said: Get Rid of the Anti Siphon. My SHO was doing the same thing, but not as bad. Removed the anti siphon and it seems to have cleared up. Had already replaced primer bulb twice. As a side note there is a drain on the bottom on the vst tank with a hose attached. You can drain it and check for fuel. I removed the anti siphon fitting. I took a 3/8 drill bit and drilled out a 1/4 inch on the side with threads, that allows the ball to come out. I pulled the spring out, cleaned everything up and reinstalled the fitting. My primer bulb now pumps up easier and the starving out until I pump the bulb has disappeared. I believe the anti siphon valve and the primer bulb check valve were creating an air lock between them some how. According to USCG regulations, unless your motor is lower that your fuel tank you are not required to have the anti siphon valve. Hmm that’s interesting I’ll try to that too.. does yours have that stupid vapor canister on the tank? Quote Link to comment Share on other sites More sharing options...
jh141 Posted May 18, 2020 Report Share Posted May 18, 2020 It Does Not. "Vapor Canister" Sound like something only a car or truck should have. After I saw that anti-siphon valve all I could think was if that thing ever stuck closed out in the wilderness, however unlikely that is, I would be screwed. No way to MacGyver that. If you decide to remove the Anti siphon keep in mind the fuel hose will not come off the fitting easy. I had enough fuel hose slack that I was able to cut the hose the length of the fitting with a razor knife and peal the line off. Mine also had two hose clamp but with the size of the clamps only one was effective, the second was just show so I was certain not to over tighten it and crush the hose at the end of the fitting. just my experience. Quote Link to comment Share on other sites More sharing options...
Pabel1993 Posted May 18, 2020 Author Report Share Posted May 18, 2020 3 minutes ago, jh141 said: It Does Not. "Vapor Canister" Sound like something only a car or truck should have. After I saw that anti-siphon valve all I could think was if that thing ever stuck closed out in the wilderness, however unlikely that is, I would be screwed. No way to MacGyver that. If you decide to remove the Anti siphon keep in mind the fuel hose will not come off the fitting easy. I had enough fuel hose slack that I was able to cut the hose the length of the fitting with a razor knife and peal the line off. Mine also had two hose clamp but with the size of the clamps only one was effective, the second was just show so I was certain not to over tighten it and crush the hose at the end of the fitting. just my experience. Yea it’s ridiculous in my opinion but alright I appreciate it I’ll give that a shot thanks Quote Link to comment Share on other sites More sharing options...
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