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Old 10-07-2013, 06:13 PM
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Default Yamaha F300 fuel pump issues

Is anyone else having a problem with the fuel pumps on f300s. Mine are 2012. I am told the brushes in the fuel pump motors are wearing faster than expected, then they are "making" a dust that is going into the vst tank, and clogging the vst filters. Anyone with advise or any other knowledge that will help me out.

Thanks
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Old 10-07-2013, 06:41 PM
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I have over 300 hours and no problems
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Old 10-07-2013, 06:59 PM
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I have almost 800 hours and have not had this problem.

How in the world is dust from the motor getting into the pump?
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Old 10-07-2013, 07:06 PM
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First I've heard of this.
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Old 10-07-2013, 07:11 PM
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dust from the fuel pump motor (electric) has brushes inside. I am being told that Yamaha knows they have a problem and is working on a fix. I was also told that they have redesigned the pump and vst tank. I only know that there is a problem when I try to open it up all the way. It is know producing the max rpms and each motor is turning up a different rpm. I have been through about 6 different sets of props and can tell you for sure its not a propping issue.
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Old 10-07-2013, 11:11 PM
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That doesn't make much sense as plenty of other engines use basically the same system without problems?
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Old 10-08-2013, 12:34 AM
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Originally Posted by stl32 View Post
Is anyone else having a problem with the fuel pumps on f300s. Mine are 2012. I am told the brushes in the fuel pump motors are wearing faster than expected, then they are "making" a dust that is going into the vst tank, and clogging the vst filters. Anyone with advise or any other knowledge that will help me out.

Thanks

I am not buying this.
If the brush "dust" made it into the VST, then the fuel would make it into the brushes. That would not be a good deal.
WHO is telling you this?
We need a little more info on the rest of the set up, boat, construction material, fuel line material, etc.
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Old 10-08-2013, 12:52 AM
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How much difference in rpm?
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Old 10-08-2013, 05:54 AM
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A few hundred rpm difference like 5700 p 5900c 5800s.
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Old 10-08-2013, 06:10 AM
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trip f300s that went on in March of this year, Replaced fuel lines when new motors went on, Pumped out the tanks on boat end of last year before I redid everything. Then before sea trial filled all tanks up with non-e. Did filter change with the break in service. Boat has been serviced every 100hr. I am no outboard mechanic, the brushes thing sounded like maybe it could be the issue... but now idk.
Just had the boat in the shop, they tested some things and found that there was a high percentage of leak down on some of the cylinders. Boat has about 300 hrs and like 250 are at idle. So shame on me for not running the boat enough. They did a "de carb" I don't know what it was all I know is they did that I got stuck with a bill for oil change, filters, plugs the whole 9 yards. Put boat back in water and no difference in running. Now I get to buy Yamaha ring free and add to my gas. I guess Yamaha expects you to fish with there outboards running at 4200 so they wont build up carbon.
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Old 10-08-2013, 06:21 AM
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Boat is Contender
trip f300s that went on in March of this year, Replaced fuel lines when new motors went on, Pumped out the tanks on boat end of last year before I redid everything. Then before sea trial filled all tanks up with non-e. Did filter change with the break in service. Boat has been serviced every 100hr. I am no outboard mechanic, the brushes thing sounded like maybe it could be the issue... but now idk.
Just had the boat in the shop, they tested some things and found that there was a high percentage of leak down on some of the cylinders. Boat has about 300 hrs and like 250 are at idle. So shame on me for not running the boat enough. They did a "de carb" I don't know what it was all I know is they did that I got stuck with a bill for oil change, filters, plugs the whole 9 yards. Put boat back in water and no difference in running. Now I get to buy Yamaha ring free and add to my gas. I guess Yamaha expects you to fish with there outboards running at 4200 so they wont build up carbon.

What did the boat have on it before?
I would start running some vacuum and pressure tests on the fuel systems.
Leakdown test this early, seems excessive, but, a decarb is good. Oil change and stuff has to happen after a decarb.
Always good to run the engines out after trolling for long periods of time, and let them cool down after before shutting off.
I would certainly run some pressure and vacuum test.
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Old 10-08-2013, 06:58 AM
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I have to call bs on the brushes because I do believe that fuel pumps are brushless motors
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Old 10-08-2013, 08:04 AM
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What did the boat have on it before?
I would start running some vacuum and pressure tests on the fuel systems.
Leakdown test this early, seems excessive, but, a decarb is good. Oil change and stuff has to happen after a decarb.
Always good to run the engines out after trolling for long periods of time, and let them cool down after before shutting off.
I would certainly run some pressure and vacuum test.
Boat had trip 250s,
What will the vacuum and pressure tests tell me?
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Old 10-13-2014, 03:02 PM
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Default F 300 vst issues

Very similar issues Grady 33 with 2012 f 300 s 722 hrs.
Last year noticed what I thought was excessive belt wear on one motor ,pulleys and tensioners seemed fine. Dealer replaced belt.
This year considerably more dust on this motor.
Started loosing rpm on this motor at cursing speed ,with further experimenting it wouldn't match other motor except at idle.

Pulled all filters and they were spotless.In draining vst tank saw black contaminated fuel ,filter was completely clogged with what I would have to say is some sort of rubber dust.

Reassembled and ran perfect,rpm matched perfectly
It's been near 100 hours and see a 300 rpm drop at wot.
Certainly not resolved.
Motors are meticulously maintained
So I don't think it's your imagination.
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Old 10-13-2014, 03:18 PM
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Very similar issues Grady 33 with 2012 f 300 s 722 hrs.
Last year noticed what I thought was excessive belt wear on one motor ,pulleys and tensioners seemed fine. Dealer replaced belt.
This year considerably more dust on this motor.
Started loosing rpm on this motor at cursing speed ,with further experimenting it wouldn't match other motor except at idle.

Pulled all filters and they were spotless.In draining vst tank saw black contaminated fuel ,filter was completely clogged with what I would have to say is some sort of rubber dust.

Reassembled and ran perfect,rpm matched perfectly
It's been near 100 hours and see a 300 rpm drop at wot.
Certainly not resolved.
Motors are meticulously maintained
So I don't think it's your imagination.
Kind of sounds like the fuel line from the main fuel tank deteriorating in your case? Is your fuel line alcohol friendly?
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Old 10-13-2014, 04:42 PM
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New fuel lines 2012. First and second fuel filters are spotless on both fuel lines. Fuel in VST tank on other motor was clear.
Really feel there is some relationship between "dust" and the fouled VST filter.
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Old 10-13-2014, 05:38 PM
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The fuel pumps have brushes. Those brushes create "dust". Fuel flows through the innards of the fuel pumps to cool and lubricate them.

Dust from the lift pump hopefully will be captured by the VST pump filter. If not, it will go to the injector where it might be captured by the injectors filter basket. If not, it should be small enough to go right on out of the fuel injector.

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Old 10-13-2014, 05:54 PM
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Makes perfect sence . Do you think the dust under the cowling is unrelated?
I tested the fuel pump while it was out be didn't realize just how it worked.

It will be interesting to see what Yamaha has to say.
Thanks for input
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Old 10-13-2014, 06:01 PM
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The fuel pumps have brushes. Those brushes create "dust". Fuel flows through the innards of the fuel pumps to cool and lubricate them.

Dust from the lift pump hopefully will be captured by the VST pump filter. If not, it will go to the injector where it might be captured by the injectors filter basket. If not, it should be small enough to go right on out of the fuel injector.

What color would that dust be?
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Old 10-13-2014, 07:36 PM
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I would guess black. Every motor brush that I have ever seen is black.

Now if it is white/tan coloured then my guess would be that it is sodium sulfate that has precipitated out of the gasoline.
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