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Mingo
 
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Last Login: Today @ 11:00:24 AM
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| For some reason my motor keeps getting what seems like vapor lock. The only thing that I can think it could be would be the ethanol that they're putting in the shell stations now. In the mornings it runs fine. For example, yesterday we ran 18 miles without stopping and it ran fine. However, after trolling and the heat building from the sun the motor starts to hesitate. When you pump the primer ball it will quit. I would say maybe theres a short in the electronic fuel pump, but it does it at unexpected times. Any suggestions on what could be wrong? Oh yeah, I changed the fuel lines and water seperator/bowl. Thanks in advance, Josh
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Sailfish
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Not saying this is it....but there have been issues with the Fuel Vapor separator. This is caused by fuel sitting.
The intake manifold must be removed to access it.
Start using Sabil "Marine" fuel additive in your fuel ALL the time.
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"Just cause it's new, doesn't mean it's worth a Damn."
Pensacola, Fl
Custom 23ft Mako Pilothouse w/ twin DF-140 Suzuki's
162 Scout w/ C-90 Yamaha
1860 SeaArk w/ DF-70 Suzuki
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Ruby Red Lip
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Last Login: 1/14/2010 6:21:20 PM
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I would dissassemlle the vst, Clean/replace the filter located at the bottom of the high pressure pump (inlet). Test the pressure regulator, Inspect the needlle & seat,etc. make sure the VST is clean & right. Make sure there is no obstruction in the VST vent& don't be afraid to replace the high pressure filter. This will fix it & should take an expierenced tech no longer than 3 hrs. Good Luck to you !
The fix it man!
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Mingo
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| still havent figured it out. the only thing i can think it could still be would be a crack in the pickup tube towards the top. it seems like after it has burned about 9 or 10 gallons when it starts hesitating. thanks, josh
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Ruby Red Lip
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I mis-read your post & thought it was doing this most of the time, so thats why I reccomended doing what I said. but do check that pick-up tube first!!! Good Luck to you!
The fix it man!
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Mingo
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| Yeah the only bad thing is the pickup tube is either cross threaded or i pulled the threads the last time i had it out. I'm afraid to try to pull it out because it may break and then ill have even worse problems. any suggestions or did i pretty much screw myself when i didnt put it in there right the last time. it didnt feel like it was cross threaded when i put it in but it does now i guess because of the pressure.
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Mingo
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| Oh, forgot to mention that the pickup tube and the tank are aluminum. (I'm an idiot)
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Ruby Red Lip
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Try this,check to see if the hose barb on your pick-up tube is an anti-syphon. if it is, remove if possible & install a regular hose barb & try to duplicate the issue. if it seems fixed, for safety reasons, reinstall a new anti-syphon valve & a new mechanical pick-up pump on your motor. Here's why, I have noticed that on these fuel injected four strokes, over time that pump gets weaker & has a harder time at idle to un-seat the anti-syphon valve, especially when the resistance increases as the fuel has to be sucked a further distance up that tube. now if you have "A" fuel hose under the deck & feel confident that this hose will never be severed, you can get away with leaving the regular barb on the tube...but the liability is on you! Let me know how this works out, Outbrdwrench!
The fix it man!
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Mingo
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| Thanks for the help Outboard Wrench. Ill try and see if that will work. Josh
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Mingo
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I did another water test and the problem is not in the pickup tube like i had suspected. The problem is still throwing me in a loop. It has something to do with the heat of the day. perhaps something to do with the fuel lines could be the problem. A friend of mine told me that there may be some dry gas in the anti-syphon valve. My next step is to check that out. The only problem is i dont know where to pick one up at. West Marine has one but it is too long for my needs. Is there anywhere else that sells them?
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Ruby Red Lip
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Did you try it with the anti-syphon valve replaced by a straight hose barb like I suggested ?
The fix it man!
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Mingo
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| no, didnt get a chance to change that before that fishing trip but maybe i can try it before this saturday when i go out. I'll let you know if it fixes anything.
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Ruby Red Lip
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Had a suzuki F90 today that would run ok (not perfect) on top end, but would idle only until it ran the VST out of gas, pump the bulb & it would again run until the VST ran out of fuel. Replaced the mechanical pump & it ran perfect at idle & top end. I have seen these Suzuki pumps provide enough fuel at idle to keep the motor running, but idle quality is poor, especially when there is a anti-syphon valve. outbrdwrench.
The fix it man!
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Mingo
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| Outboard Wrench, The problem seems to be fixed. It was the craziest thing, we were going on an edge trip and pumped the primer ball, we noticed that there was fuel shooting out of the seperator. The leak was the stud that comes out of the bracket that the seperator screws onto. The stud was completely broke out of the seperator. We put a new bracket on and went fishing on the edge. After about 75 or 80 miles we came to realize that the motor never hesitated or starved for fuel, but instead, ran perfect. My thought is that if the problem was not fixed, surely after 35 or 40 miles in the heat of the day (4:00 in the evening) it would have starved for fuel. PROBLEM FIXED. Thanks to everyone for all your help, Josh
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Ruby Red Lip
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Glad to hear it! outbrdwrench.
The fix it man!
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