BEERSGOOD Posted June 5, 2016 Report Share Posted June 5, 2016 Hello all, I took my ride out for a rip a few weeks ago and it ran great until I slowed to turn around. It stalled and would not restart. Thinking it may have some water in the gas because it sat for a little while, I drained the VST and the clear bowl on the side of the engine. I pumped the bulb and it started and ran for about a minute. I unscrewed the VST drain plug and nothing came out. After sitting in the harbor for an hour messing with it I decided to try starting it with the throttle engaged. It fired up and ran very rough. At full throttle it moved at idle speed. I assume running it at 4800 RPM and bareley moving wasnt good for it but I made it back to the dock. I tinkered with it a little and it seems that the mechanical fuel pump may need to be replaced. I pump the bulb and it will start and eventually stall. The VST is dry and when I pump the bulb, fuel spurts out of the VST drain. Am I correct in my assumption that the mechanical fuel pump is toast? Thanks in advance for any input! Link to comment Share on other sites More sharing options...
DROWNING SHRIMP Posted June 5, 2016 Report Share Posted June 5, 2016 It's making 4800 rpm and not moving? If so ,that's not fuel !more of a gear or prop slip issue. Link to comment Share on other sites More sharing options...
DROWNING SHRIMP Posted June 5, 2016 Report Share Posted June 5, 2016 Switch to a external tank to rule out water Link to comment Share on other sites More sharing options...
fishinbill85 Posted June 5, 2016 Report Share Posted June 5, 2016 I'm not a mechanic, but it seems that if you were actually pushing the motor to 4800 rpm and only moving idle speed... you also have some gearing problems. Maybe I read your post wrong. I always start small when troubleshooting, working up to the more expensive fixes (usually my luck)... How old are your filters? Do you have a racor so you could check the bowl for sediment or water? If not, pull the filter off and turn it over in a bucket and look. Could they be clogging enough that the engine is struggling to pull fuel naturally? I would think the bulb may hide that issue being as you're forcing fuel under pressure up to the motor. How old is the primer bulb, condition? If they get old and develop small cracks inside, your fuel system can struggle to stay primed, so I've heard Sitting = death for boats. Is the gas E-10 pump gas? If so it may indeed be bad gas due to the phase separation. Link to comment Share on other sites More sharing options...
fin-addict Posted June 5, 2016 Report Share Posted June 5, 2016 my guess, not a gear/prop problem at all !!!!! fuel delivery all the way. !!!!! Link to comment Share on other sites More sharing options...
BEERSGOOD Posted June 5, 2016 Author Report Share Posted June 5, 2016 Its definitely fuel delivery. It wont start at all unless I have it throttled up and once it starts running it dies shortly after. I use Rec 90 and I replaced the filters (first thing I did). I too usually start with the most complicated expensive thing to find out it was something simple. That is why I turned to the forum before I went all crazy with changing out pumps. I would think spun prop if it didn't have the running issue and it was a very rough 4800 RPM... The bulb is pretty old so maybe I should start there. Thanks for all the replies, keep the ideas coming!! Link to comment Share on other sites More sharing options...
smilemaker Posted June 6, 2016 Report Share Posted June 6, 2016 If you are having to pump the bulb to fill the vst and filter then you probabaly have 2 bad low pressure fuel pumps. I have a 2004 200 vmax and went around and around replacing the entire fuel system from the motor back only to find that it was 2 $40.00 pumps that are easy to replace with basic mechanic skills. If you have not had them replaced you are overdue on your 2004. The diaphram gets weak and will pump some to allow the boat to crank but not enough to supply the vst and midlevel pump enough to feed the hungry beast. Link to comment Share on other sites More sharing options...
BEERSGOOD Posted June 6, 2016 Author Report Share Posted June 6, 2016 That was my first thought. I was unaware that there are 2 of them though. I will have to google a yamaha fuel system schematic... Link to comment Share on other sites More sharing options...
fishinbill85 Posted June 6, 2016 Report Share Posted June 6, 2016 Very rough or not, 4800 rpm, boat IN gear, will cause your boat to move much quicker than idle speed unless you have driveline issues or a spun prop. Like I said, I may have just read it wrong. The primer bulb is a good thing to replace every so often for peace of mind. I had issues similar with my 115v on my hewes, replaced the primer bulb (with the correct one) and it ran like a top. Hope you get it resolved quickly and easily. Link to comment Share on other sites More sharing options...
fin-addict Posted June 6, 2016 Report Share Posted June 6, 2016 jmo, motor my have kicked into limp home mode after hitting 4800 rpm's to prevent any damage. happened to my brothers 200 vmx. same issues and symtoms. do not recall the cause. how is the oil level in the motors oil tank. thinking it might have been the oil pump in the large tank. has an alarm gone off. Link to comment Share on other sites More sharing options...
Lap it Up Posted June 6, 2016 Report Share Posted June 6, 2016 Start off by checking your fuel lines. They collapse and restrict fuel flow. Change your primer ball (make sure the primer ball is in between the tank and the racor so it works correctly). Pull your water separator/racor and check for debris or water. Make sure your filters aren't sucking air. Next you need to find someone with a fuel pressure gauge. It attaches to the shrader on the VST and run the engine. Should be 50.5psi at start up and maintain between 43 and 51 while running. Link to comment Share on other sites More sharing options...
BEERSGOOD Posted June 10, 2016 Author Report Share Posted June 10, 2016 I haven't had a chance to work on it. Work got crazy all of a sudden. Oil tank was good, no alarms sounding. I replaced all the filters and will be replacing the primer bulb as soon as I can get to it, planning on Saturday! I will get a hold of a fuel pressure gauge as well. This forum is still awesome!! I haven't been on in a long while and you guys came out of the woodwork to help me out! Thanks to all!! I will post an update as I work through all of the suggestions... Link to comment Share on other sites More sharing options...
Flatsout1171 Posted June 15, 2016 Report Share Posted June 15, 2016 I had the same issue with my 2005 250hpdi dropped it off at the mechanic and found that my fuel line from the seprator to motor had collapsed inside.just picked it up dropped in cranked right up idled great and runs like a rapped ape. Link to comment Share on other sites More sharing options...
BEERSGOOD Posted June 19, 2016 Author Report Share Posted June 19, 2016 Well, I finally got to tinker a bit. Been working 70-100 hours a week, bleh!! I replaced the primer bulb and the issue hasnt changed. My next step is the low pressure fuel pump(s). Does anyone have a link to a video or a picture or two that may be of assistance, I will check out the fuel lines as well. as always, thanks for the tips!! Link to comment Share on other sites More sharing options...
Hamfisted Posted June 20, 2016 Report Share Posted June 20, 2016 You can download the factory service manual here: Hope it helps ..... -Mike LIT-18616-02-82.pdf Link to comment Share on other sites More sharing options...
BEERSGOOD Posted June 30, 2016 Author Report Share Posted June 30, 2016 Here's an update.., I replaced both low pressure fuel pumps and it runs way better. It idles smooth and runs longer than it previously did so that was definitely part of the problem. However, it still stalls after a few minutes of idling and I have to pump the bulb to get it to restart (It wouldn't start unless the throttle was engaged before) . I chanced it and took it for a test run and it got up on plane but stalled out after a few seconds. My next guess is the pickup and line from the tank to the bulb.I have recruited a mechanic to give me a hand in his spare time as well... I will hopefully have a final solution to post soon. Hopefully it will help someone else out as well! Thank you for the link Hamfisted!! Link to comment Share on other sites More sharing options...
Lap it Up Posted July 1, 2016 Report Share Posted July 1, 2016 Fuel restriction. Fuel lines collapsing or anti Syphon valve is bad. I'd start at fuel lines. Have you checked fuel pressure and pump voltage while it's running? Link to comment Share on other sites More sharing options...
BEERSGOOD Posted July 1, 2016 Author Report Share Posted July 1, 2016 The mechanic is going to check the fuel pressure, siphon valve is on order, I am going to replace the fuel line while I am at it to... Link to comment Share on other sites More sharing options...
fsusteve Posted July 2, 2016 Report Share Posted July 2, 2016 I had a similar issue with mine, went thru the usual suspects, everything checked out. My trusted boat mechanic said he had seen this before with the fuel injection drivers, he swapped them with each other and boat has been fine since, something about position and vibration and blah blah blah, I didn't buy in until it ran flawlessly since, just a thought. Link to comment Share on other sites More sharing options...
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