Water in fuel?

bigassredfish · 02-11-2012, 02:40 PM

I have a two stroke 90hp Yamaha and had some issues out on the water yesterday. Whenever I started getting up on a plane the engine would rev down. It would drop from 4000 RPMs to around 2000 RPMs. I would leave the throttle pushed forward and occasionally without notice if would jump back into full speed then back down again. This went on all day and made for a long trip. I am not an expert mechanic by any means but it seems like there might be water or something in the fuel. What is the best and easiest way to fix this issue? Thank you for the help.

lobsterman · 02-11-2012, 02:55 PM

are you using ethanol fuel?

bigassredfish · 02-11-2012, 03:02 PM

87 unleaded gasoline

Just_Ducky · 02-11-2012, 03:08 PM

I had the same problem with my Yamaha 225. It was the H2O sensor.

Sequoiha · 02-11-2012, 03:32 PM

it definatly sounds like a fuel issue, not sure it is water, but it certainly sounds like you have some junk in your carbs, we are having many issues with this, we have a new very good ultra sonic cleaner that insures we get it all out,, give me a call.

aroundthehorn · 02-11-2012, 04:08 PM

How long has it been since you changed you fuel/water separator?

TheCaptKen · 02-11-2012, 06:39 PM

Remove the coils on the rear of the engine, clean all the ground connections and get the salt off them. Reinstall and spray some WD40 or something like that over the area. You are losing a coil and dropping from 3 cylinders to 2 then back to 3. If its not the connection, then you will need to determine which coil is failing. Could also just be a sparkplug fouling.

nojerseydevil · 02-11-2012, 07:32 PM

I had that problem and checked my fuel filter and found fragments of plastic, It most likely came from my fuel tank, stemming from Ethanol fuel. I cleaned my tank, changed my fuel, change the filter, added SeaFoam, and try to use non-ethanol fuel.

NJD

bigassredfish · 02-12-2012, 10:44 AM

Thanks for all the tips. I am going to try and do all of the above and give it a nice tune up. I did change my water/fuel separator about 3 months ago.

Hot Dog · 02-12-2012, 11:44 PM

If you have water or crap in your tank your filter could already be stoped up again.

02-11-2012, 02:40 PM	#1
bigassredfish Member Ruby Red Lip Join Date: Apr 2011 Location: pensacola Posts: 85	Water in fuel? I have a two stroke 90hp Yamaha and had some issues out on the water yesterday. Whenever I started getting up on a plane the engine would rev down. It would drop from 4000 RPMs to around 2000 RPMs. I would leave the throttle pushed forward and occasionally without notice if would jump back into full speed then back down again. This went on all day and made for a long trip. I am not an expert mechanic by any means but it seems like there might be water or something in the fuel. What is the best and easiest way to fix this issue? Thank you for the help.

02-11-2012, 02:55 PM	#2
lobsterman Jiggin Finatic Blue Marlin Join Date: Sep 2007 Location: Okaloosa Posts: 5,877	are you using ethanol fuel? __________________ AKA Jiggin Junkie II Chronicles 7:14 Randy's Canvas & Marine Vinyls 850-279-4140 850-855-5314 cell Custom Awnings - Repairs Boat Cushions - Curtains and more

02-11-2012, 03:32 PM	#5
Sequoiha Senior Member White Marlin Join Date: Sep 2007 Location: Pensacola Florida Posts: 2,624	it definatly sounds like a fuel issue, not sure it is water, but it certainly sounds like you have some junk in your carbs, we are having many issues with this, we have a new very good ultra sonic cleaner that insures we get it all out,, give me a call. __________________ Kenny Mann Ms Penny Fishing Team Member NRA 172499461 Minn Kota Authorized Service Center Dealer for The Super Stick www.thesuperstick.com Emerald Coast Marine LLC Allmost Anything Computers 4610 Saufley Field Rd Pensacola Fl, 32526 1-850-456-8196 1-850-455-8318 Sequoiha@cox.net Kenny_Mann-ECM@cox.net

02-11-2012, 06:39 PM	#7
TheCaptKen Senior Member Trigger Join Date: Mar 2011 Posts: 295	Remove the coils on the rear of the engine, clean all the ground connections and get the salt off them. Reinstall and spray some WD40 or something like that over the area. You are losing a coil and dropping from 3 cylinders to 2 then back to 3. If its not the connection, then you will need to determine which coil is failing. Could also just be a sparkplug fouling. __________________ NelsonMarineService.com

02-11-2012, 07:32 PM	#8
nojerseydevil Senior Member Trigger Join Date: Jan 2009 Location: Navarre, FL Posts: 337	I had that problem and checked my fuel filter and found fragments of plastic, It most likely came from my fuel tank, stemming from Ethanol fuel. I cleaned my tank, changed my fuel, change the filter, added SeaFoam, and try to use non-ethanol fuel. NJD __________________ "I have a BMW. But only because BMW stands for Bob Marley and The Wailers, and not because I need an expensive car." Bob Marley

02-11-2012, 03:02 PM	#3
bigassredfish Member Ruby Red Lip Join Date: Apr 2011 Location: pensacola Posts: 85	87 unleaded gasoline

02-11-2012, 03:08 PM	#4
Just_Ducky Senior Member Trigger Join Date: Sep 2008 Posts: 372	I had the same problem with my Yamaha 225. It was the H2O sensor.

02-11-2012, 04:08 PM	#6
aroundthehorn Senior Member Sailfish Join Date: Aug 2010 Location: Pensacola, FL and East Central AL. Posts: 1,674	How long has it been since you changed you fuel/water separator?

02-12-2012, 10:44 AM	#9
bigassredfish Member Ruby Red Lip Join Date: Apr 2011 Location: pensacola Posts: 85	Thanks for all the tips. I am going to try and do all of the above and give it a nice tune up. I did change my water/fuel separator about 3 months ago.

02-12-2012, 11:44 PM	#10
Hot Dog Senior Member Mingo Join Date: Dec 2007 Location: Pensacola, FL Posts: 126	If you have water or crap in your tank your filter could already be stoped up again.

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