Fuel pump diaphragms going bad every 30-60 days Fuel pump diaphragms going bad every 30-60 days
Bass Fishing Home PageTM    Boats and Motors  


Boating Equip.
Tackle Shops
Fishing Acc.


Fishing Reports
BFHP Articles
Fishing News
Fishing Tactics
Places to Fish
Boat Ramp Stories
Other Topics
Other Fishing Topics
Swap/Sell (no boats)
Props 4 Sale

Boats 4 Sale
Saltwater Fishing
Striped Bass
Lure Making
OBX Wildlife Photos
More Politics

Boats and Motors

    Fuel pump diaphragms going bad every 30-60 days
from fishintechnician #13154 #13154  
4/29/2012 9:16:35 AM


 About six months ago I started to have problems with my boat, when it reached 4500 RPMs it would shut off... I had all three fuel pumps replaced on my 2005 Yamaha 250 hp ox66 replaced and it ran perfectly for about a month.. Then I would have the same problem. My mechanic said the diaphragms inside the pumps were bad. He replaced it and it will work fine again for a month. then the same thing would happen. I only use 93 octane gas in my boat. Around the same time I start having these problems I started using Yamaha Ring-free and Startron fuel additive needless to say I'm going to stop using the Star Tron. But has anyone heard of this product causing these problems before or is something else eating up my diaphragms?

Rate this message:
1 Star

2 Star

3 Star

4 Star

5 Star

   Fuel pump diaphragms from Mike1957 #11182 #11182  4/29/2012 10:16:28 AM
 More than likely it is the ethanol that is causing the problem. Additives like Star tron are to remove the water and prevent phase separation of the fuel, which can be a problem with ethanol if it sits in the fuel tank for any length of time. I use the new additive Lucasoil came out with last year that is rated for E10, E15, and E85 ethanol.

   Why from Jeff Hahn  4/29/2012 7:59:19 PM
 Why run the 93 octane? I don't know if it is true, but I have been told that the 93 octane often contains more ethanol than the 87 octane. In fact, at least two dealers I am aware of have told Opti owners not to run the 93 octane due to problems it causes. Maybe someone else can add to this or correct my understanding.

Jeff Hahn

   Ethanol from BCB  4/29/2012 11:46:22 PM
 We find less ethanol in Premium usually. It's pretty simple to test with a few glass jars, and everyone should. We also are big fans of SeaFoam.

Ethanol causes all sorts of problems, though it shouldn't break down fuel pumps this soon.

   Only the federal goverment would have you put perfectly good corn in your gas tank. Idiots. nm from Wackoman  4/30/2012 7:31:17 AM

   ethanol sucks but from MikeF  4/30/2012 8:13:36 AM
 There is no way it could destroy your diaphragms that quickly. Either they were bad, installed wrong or something else in the pump caused the failure.

   Sure Ethanol Sucks! from Rangerman  4/30/2012 9:38:56 AM
 however I agree with Mike F, even ethanol won't kill a diaphragm that quick. Quick question, does you motor have a fuel filter in inside the fuel injection of high pressure system than could restrict the fuel flow to over work the diaphragm? ?? That want was causing my problems before ethanol.

   Rangerman from fishintechnician #13154 #13154  4/30/2012 10:51:17 AM
 I'm not sure, my motor isn't the HDPI version. But we replaced the fuel filter too. This mechanic changed everything from the fuel tank to the fuel pumps. We tested the boat after each item was replaced. I saw the guy take out each diaphragm this time and they were definitely compromised. I had a different guy fix it this time, so we will see if that makes a difference. But I'm at a loss, my regular mechanic said the concentration of ethanol isn't consistent and it can be as high as 15% depending on where you buy it from.

   fishintechnician from GMH #14251 #14251  4/30/2012 3:04:25 PM
 Do you still have the prop for sale that you advertised on the props 4 sale page?

   Yes a Mercury Trophy from Rangerman  5/1/2012 9:03:11 AM
 25 Pitch I think. If you in the area you are welcome to run it and it works for your rig. Great. Try it before you buy it. Live on Lake Norman NC

   I spoke with customer service at Yamaha from fishintechnician #13154 #13154  5/1/2012 5:12:33 PM
 They said there are several reasons why the fuel pump diaphragms may be popping. the first reason was a bad O2 sensor which can cause the engine to sputter and the increased pressure can cause to diaphragm to pop. the second reason was contaminants running over the fuel pump diaphragms they also recommended I do not use fuel stabilizer if my boat does not sit long periods time. doing the winter when it does sit for more than a month he recommended that I just drain the gas tank... so the O2 sensor was cleaned this time along with new fuel pumps so let's see if that cures my problem. lastly he said the resistors that go on the end the spark plugs can also cause the engine to sputter which can cause increased pressure which may lead to diaphragm failure

   fuel pump from MrBullet  5/5/2012 9:52:50 AM
 you can buy an electric fuel pump that puts out a maximum of 3 lbs. of pressure,, thats what I put on mine



Can't remember your password? Click here!
Email Address:

Users with subscriptions can attach pictures to their comments by using the form at http://www.wmi.org/newboard/upload_pictures/"




Advertising/Sponsor Information

Register to post messages and reports


Subscribers don't receive these ads

Fishing Reports
BFHP Articles
Fishing News
Upcoming Events
Rally Page
BFHP Surveys
Fishing Tactics
Places to Fish
Other Topics
Product Evaluations

Boat Ramp Stories
Trailers & Towing
Boats For Sale
Tournament Tactics
Striped Bass

Fly Fishing
Saltwater Fishing
Non-Fishing 2
Political Hook
Tall Tales, Fiction & Legend
Complete Listing of Boards
Copyright © WMI, Inc. 1995-2016. All rights reserved.
This message board created and maintained by: WebMasters International, Inc. (WMI) address mail to wmi@wmi.org

WMI disclaimer
Privacy Statement