jimmer Posted May 11, 2017 Report Share Posted May 11, 2017 Hi Guys Hoping someone out there can answer this question. I have a 25 hp Yamaha, put a new gas line on it at the end of last year, I run it wide open for a bit, then it dies. I pump the primer ball at it throttles up again but the ball is collapsed like there is a vacuum inside. Anyone have any ideas what is causing this? Is it possible it's the tank? Thanks! Link to comment Share on other sites More sharing options...
Sinker Posted May 11, 2017 Report Share Posted May 11, 2017 I assume its on the right way? S. Link to comment Share on other sites More sharing options...
LeXXington Posted May 11, 2017 Report Share Posted May 11, 2017 vent closed Link to comment Share on other sites More sharing options...
DanD Posted May 11, 2017 Report Share Posted May 11, 2017 Fuel tank vent clogged, not allowing air in tank? Try running motor with gas cap removed. The fuel pick-up line inside the tank, clogged or collapsed; not allowing fuel to pass? The motor's fuel pump must be working because it's sucking the primer bulb down. Dan. Link to comment Share on other sites More sharing options...
mike rousseau Posted May 11, 2017 Report Share Posted May 11, 2017 I assume its on the right way? S. Sounds funny but mine was installed backwards from the dealer Idled great then stalled when opened up and ball collapsed There's an arrow on the ball and it should point at the motor Link to comment Share on other sites More sharing options...
AKRISONER Posted May 11, 2017 Report Share Posted May 11, 2017 whenever Ive forgotten to open the breather valve I notice that my entire tank suctions...but you may be using a steel tank. It definitely sounds like the breather valve is clogged. Trust me I scared the crap out of myself one time after making a really long run in the evening I was one my drive home as it was getting dark and my engine stopped...stupid me. Link to comment Share on other sites More sharing options...
jimmer Posted May 11, 2017 Author Report Share Posted May 11, 2017 Thanks for the replies. I will add some more info: The arrow is pointing the right way, it's a plastic tank and the pick up is made of hard plastic, I took the cap off and actually took it apart to make sure the vent wasn't clogged (it was clear). Is it possible that the connection on the tank is damaged internally? Link to comment Share on other sites More sharing options...
DanD Posted May 11, 2017 Report Share Posted May 11, 2017 Take the fuel line off from the inlet side of the primer bulb and try blowing air back into the tank. It shouldn't take much effort to blow a steady stream of air through the line and get bubbles in the tank. Dan. Link to comment Share on other sites More sharing options...
jimmer Posted May 11, 2017 Author Report Share Posted May 11, 2017 Thanks Dan, I will check that out. Link to comment Share on other sites More sharing options...
Fisherman Posted May 11, 2017 Report Share Posted May 11, 2017 Well if the pick up was clogged or the primer clogged then it wouldn't allow fuel to be picked up in the first place. Link to comment Share on other sites More sharing options...
BillM Posted May 11, 2017 Report Share Posted May 11, 2017 Well if the pick up was clogged or the primer clogged then it wouldn't allow fuel to be picked up in the first place. It might allow enough for idle, but as soon as he goes WOT, not enough fuel. Link to comment Share on other sites More sharing options...
DRIFTER_016 Posted May 11, 2017 Report Share Posted May 11, 2017 I had a brand new ball that did that. Was an issue with the ball. Bought a different brand and all was good. Link to comment Share on other sites More sharing options...
chris.brock Posted May 11, 2017 Report Share Posted May 11, 2017 New fuel line eh, my guess is it's not the right one or a crappy one and the valve on the connector to the tank isn't opening all the way. Link to comment Share on other sites More sharing options...
Rattletrap2 Posted May 11, 2017 Report Share Posted May 11, 2017 The fuel tank on my 20 HP Merc did that many years ago. Turned out the screen on the bottom of the pick-up tube had slid up on the tube for some reason. At low idle or low speed, enough fuel would get by to keep the engine running. Once you cranked the throttle, the engine would run out of fuel and die. Once the motor sat for a minute, enough fuel would get by to start it up again. I removed the tube and attache the screen more securely with a clamp or tyrap. I have no idea how or why it did that. Link to comment Share on other sites More sharing options...
jimmer Posted May 11, 2017 Author Report Share Posted May 11, 2017 Lots of things to check and consider. I have replaced a couple of primer balls and connectors over the last few years and thought I had it figured out. Just had put two new connectors on this spring due to the small gaskets breaking. Not sure if there is a better quality primer ball available. I had bought one last year and it didn't work from day one, so I replaced it with the one I have on there now. I'm leaning towards the problem being between the primer ball and the bottom of the gas tank. I'm going to pull out the pick up tube, maybe the screen is gummed up from ethanol. Link to comment Share on other sites More sharing options...
Sinker Posted May 11, 2017 Report Share Posted May 11, 2017 (edited) Just disconnect the gas line from the tank, remove the end and put it directly into the tank and see if that works. Just by pass the pick up in the tank. EDIT: if it was be I'd just go buy a brand new gas line and go from there. Get one that's alcohol resistant. S. Edited May 11, 2017 by Sinker Link to comment Share on other sites More sharing options...
jimmer Posted May 11, 2017 Author Report Share Posted May 11, 2017 I've bought new gas lines twice already in the last year Sinker. However, it could be the after market parts just suck. Even when I order parts from the Marina, they give after market parts. Those connectors that are bought off the shelf just seem like they never fit right. I will try that by-pass; not sure why I didn't think of that. LOL Link to comment Share on other sites More sharing options...
jimmer Posted May 16, 2017 Author Report Share Posted May 16, 2017 Just thought I would update on this issue. I pulled the tank apart and the pick up looked fine. I noticed that the male connection on the tank was out of round a little, so I re-shaped best I could. I took it for a run with the tank on the seat beside me and it ran fine, put the tank and the floor and there was an issue. I pumped the ball in a vertical position and parked the boat. Went out on opening day and didn't have a problem with it. (go figure) I also bought a new after market tank and connector just in case. Link to comment Share on other sites More sharing options...
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