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Anybody know what the consistent hum coming from engine is?

rtlister

rtlister

New member
I'm hearing a consistent hum from the engine (2014 RT). Everything seems to be running fine... engine performance is normal... but this hum is not normal. It does it while moving or in idle. It's pitched similar to the G note on a keyboard and doesn't vary up or down (pitch) with RPM's. Any body know what I'm talking about?
 
Very common fuel pump sound. Some have been successful having it replaced under warranty but mostly it is just considered by most dealers to be "normal". Irritating sound and expensive to replace..... Jim
 
Joel The Biker said:
fuel pump. Mine did that when I purchased it used. I put a capfull of marvel mystery oil in the fuel tank and it is totally silent now.
Click to expand...

I have not heard of marvel mystery oil. I have tried some fuel additives but that hasn't made any difference.
Where can I find Marvel Mystery Oil. And is it recommended as a fuel additive? After that first tank (with the oil in it) was gone, did the "hum" return? Thanks
 
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Last edited by a moderator:
UtahPete said:
This is the first I've heard of the stuff. Gets good reviews FWIW https://www.amazon.com/Marvel-Mystery-Oil-MM12R-Pack/dp/B0725JQXKS?th=1
Click to expand...
I believe I first heard about it in my teens, over 60 years ago. Always thought of it as another one of those "snake oil" cures for every engine ill imaginable! But, maybe it's good stuff. I've never used it. I just looked at their website. Next year will be their 100th anniversary, so if nothing else you have to give them credit for business longevity!
 
Fuel Pump Noise

Joel The Biker said:
fuel pump. Mine did that when I purchased it used. I put a capfull of marvel mystery oil in the fuel tank and it is totally silent now.
Click to expand...

Just wanted to know if this fixed the problem.
Do you have to use the 'Marvel Mystery Oil' on a
monthly Basis?
Or Are you saying one time an done?

Also what year and model did you do this 'MM Oil' treatment? I see you have a 2021?
 
I am a big fan of Marvel, I use it on a lot of things, it's a good lubricant for squeaks and all kinds of stuff!! But good luck on this fuel pump item, I find it hard to believe that it will be the cure all for this issue, it will mix into the gas like a two-stroke oil and lubricate any exposed bearings, but it will wash out after the next tank of gas!!:dontknow:
 
Be careful with adding oil to the gas, the cat (if you still have it) can get get clogged up if too much oil is run thru. A little would probably be ok.
 
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my 2014 RTs had a noisey fuel pump. I considered replacing the fuel pump, but tried some marvel mystery oil first. It only took one treatment and the noise has not returned. It has been many thousands of miles. Read the instructions for how much to add to a tank of gas. website says 4 ounces for 10 gallons of gas. I seem to remember adding a capfull or 2. It is amazing stuff
 
Last edited:
Joel The Biker said:
fuel pump. Mine did that when I purchased it used. I put a capfull of marvel mystery oil in the fuel tank and it is totally silent now.
Click to expand...

Well, I tried the Mystery Oil (in a couple tanks) and it hasn't changed the "hum". Most every one who has commented on my description of the "hum" (as I call it) thinks it's probably the fuel pump. And that sounds logical to me since the sound is consistent (which would be consistent with an electric pump ... not like old mechanical pumps which could change with RPMs)
Any other ideas welcomed.
Thanks
 
When you first start it, and let it warm up is it humming then, or is it humming when you put it in gear and start riding? It could be your compressor pump for your air bag! It will kick into pump mode when the bikes put into gear, if it's calling for air.
 
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