Yamaha help

Here is what i have.....
Yamaha 30hsp tiller oil injected

Went out today, and motor starts fine as it usually does. I have zero problems from this motor.
Headed back to ramp crossing lake, throttle up....runs fine for little while then starts bogging down....i quickly sqeeze priming bulb and throttles up then dies......i squeeze theottle bulb and starts fine, throttle up and runs WO no problem but then starts bogging down again after few minutes WO throttle.......
Im not mechanic but seems as tank ventilation not working well or inside fuel system jacked.....been several years since carbs worked on...boat kept inside shop at all times......

Any info much appreciated

could be your fuel line and bulb !!!! I would check that first !!!!

if you have to keep squeezing the fuel bulb on the fuel line you have a leak some wheres could be the bulb or the hose or one of the fittings just replace it its cheap enough.
I see this almost every day. also check and make sure your vent is open on the tank for it to draw fuel.

That is also the symptom of a bad fuel pump.

Hey,
Barnacle Bill is dead on.I have 2000 VMAX 150 that had similar problems.Tried several things --stayed about the same.Went reading several boating forums and found someone describing my symptoms to a T.My 150 has 2 fuel pumps and one of the 2 had a tear in the fuel pump diaphragm.Went online (marine parts plus -only one supplier of many)and found it was actually about the same money to buy complete pumps as to buy just the diaphragms.Ordered pumps and a couple fuel filters,put them in and she runs like a top again and since.....If you remove the fuel pumps and inspect the diaphragms you can probably see a tear.....Good luck ..... PM or reply to thread with any questions

Thanks for the good info but this is a 1997 model 30hp tiller steer, has carbs. Will keep this thread posted for updates...i looked at fuel line, looked okay but took to shop cause anything more than that im not gonna be able to do it.

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Originally Posted by tommyboyrn

Thanks for the good info but this is a 1997 model 30hp tiller steer, has carbs. Will keep this thread posted for updates...i looked at fuel line, looked okay but took to shop cause anything more than that im not gonna be able to do it.

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my fuel line looked good too , but it was bad the inside of the fuel line was clogging up from
deteriorating from ethanol !!! now this was the line on the boat when I got it !!! changed line and bulb a no problem since !!!

Tiller w/carbs still has fuel pump(s)....

My issue was sort of like that. Could not get any speed but it started and ran fine. Did the sea foam in the yard and next day wot at the lake didn't seem to help so did the tune up, carbs and all. Solution was changed fuel line and was amazed at the difference. The old line was so clogged, hardly any fuel could get thru. Fuel line replacement was $60 so just bought fuel line for $1 a foot and bought new ends for line for 1/5th the cost at the local auto parts store. Owned evinrude/Johnson all my life with 1 mercury. Yamaha is the BEST I have ever had!

I didnt know had fuel pumps since had carbs....i learned something. ....i will change fuel line and bulb. I know it has good gas as i just filled tank ethanol free with seafoam added every time.

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Originally Posted by RM Fishin

My issue was sort of like that. Could not get any speed but it started and ran fine. Did the sea foam in the yard and next day wot at the lake didn't seem to help so did the tune up, carbs and all. Solution was changed fuel line and was amazed at the difference. The old line was so clogged, hardly any fuel could get thru. Fuel line replacement was $60 so just bought fuel line for $1 a foot and bought new ends for line for 1/5th the cost at the local auto parts store. Owned evinrude/Johnson all my life with 1 mercury. Yamaha is the BEST I have ever had!

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that is similar to what mine would do !!! if the fuels is grey or silver which mine was the the inside of the fuel line has a clear tube which becomes faulty and starts to deteriorate and clogs the line so only a small amount of fuel gets thru the line !!! and seems to only show up when the motor is put under a load like full throttle !!! what I did was go the Napa auto parts store and got my fuel line that was rated for ethanol fuel to be on the safe side !!! I always do seafoam and sta-bil on every fill up !!!!!

my gut feeling is the carbs are clogged from the fuel line breaking down from ethanol that you don't drain out of your engine every time you go out. putting in a new line and bulb is a start, but i bet you also need to get the carbs cleaned. easy to do, just go to you tube and put in your engine and there will be several series on how to clean carbs.

About how often would u change fuel line exposed to ethanol? Every year? Every 2 years? Gonna make it standsrd winter maintenance just didnt wanna over do it

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Originally Posted by tommyboyrn

About how often would u change fuel line exposed to ethanol? Every year? Every 2 years? Gonna make it standsrd winter maintenance just didnt wanna over do it

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after i started having problems, i now change mine every two years, use sea foam in every tank, and run out my gas lines after every trip. no problems since :biggrin

Why not just change all the fuel lines out with fuel lines made for ethanol

Is there any "brand" better or just go to tractor supply get some fuel line and piece one together......

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Originally Posted by tommyboyrn

Is there any "brand" better or just go to tractor supply get some fuel line and piece one together......

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Go to NAPA or another good parts house. Get ethanol fuel line. They should have plenty of it.

Thanks cray

They cleaned and put carb kits in it, changed fuel filter, i changed fuel lines......once i got new lines on i cut older lines to see...they had deterioration but not complete trash but now new hoses throughout and clean carbs