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Honda EU7000is Rust Issue

3875 Views 85 Replies 17 Participants Last post by  Colt Carson, 
S
As a matter of background, I had my previous EU7000 for about 3 1/2 years and decided to sell it to upgrade to the current version with Bluetooth, etc. My previous unit was in pristine shape and no rust whatsoever and always kept in garage. I've had my current unit for just over 7 months. My neighbor also has the newer version, same unit but purchased about 1 year ago. When my neighbor asked for help with her unit, I also helped fill the gas tank. When removing the gas cap, there was a lot of rust on the fuel tank's rim where the cap connects. I thought that was very unusual for a relatively new unit and one kept in her garage. Also disappointed as I recommended the Honda unit to her. Then due to the recent storm, I too added a few ounces of fuel to the top-off level recommended in manual and noted the beginning of pitting (the beginning of rust) in the identical location of my neighbor's unit - the pitting/rust is under where the gas cap gasket seats to the fuel tank. Cap appears to seat firmly and snug in place so I don't think it's a bad gasket. My unit is also stored in the garage and partially air conditioned from house. I am totally perplexed as my previous unit didn't have any rust at all, was stored in identical location and have always used the suggested E0 fuel. Are there others that have the new version Honda EU7000is for over 7 months that have the same rust problem beginning? I'll get a photo of my neighbor's unit that will show terrible rust while mine appears to just be starting. I did coat the area with motor oil to hopefully slow down the rust.

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S
I've been using E5/E10 fuel for the last 3-4years with this stuff in the fuel and I see some gunk sitting at the bottom of the tank. But haven't had no problems with starting or running the generator so far and I dont run the engine dry either.
www.amazon.co.uk

Briggs & Stratton Fuel Fit Additive/Stabiliser. 992381 : Amazon.co.uk: Automotive

Briggs & Stratton Fuel Fit Additive/Stabiliser. 992381 : Amazon.co.uk: Automotive
www.amazon.co.uk
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OrlyP
speedy2019 said:
I've been using E5/E10 fuel for the last 3-4years with this stuff in the fuel and I see some gunk sitting at the bottom of the tank. But haven't had no problems with starting or running the generator so far and I dont run the engine dry either.
www.amazon.co.uk

Briggs & Stratton Fuel Fit Additive/Stabiliser. 992381 : Amazon.co.uk: Automotive

Briggs & Stratton Fuel Fit Additive/Stabiliser. 992381 : Amazon.co.uk: Automotive
www.amazon.co.uk
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IMO, they only work best on E0. They seem to extend the life of the gasoline's ability to ignite, but does little to nothing in the way of protecting the fuel system from corrosion due to the ethanol content.

As to the Honda tank, I doubt it's made of stainless steel. Stick a magnet on it and find out. More often than not, the magnet won't stick if it's SS. Sometimes, it does so but with a weak bond which is only due to the iron that may have been forged into the sheet material. But if it's a steel tank, the magnet will stick on it at full strength.
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pipe
StormReady said:
.. but didn't see the one year...
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There are a number of them, using YT search box, easy to find and concatenate the phrase .... taryl fixes all

The key finding was that ethanol free fuel works, all by itself. Here is the bowl drop of sta-bil with corrosion/gel

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OrlyP said:
IMO, they only work best on E0. They seem to extend the life of the gasoline's ability to ignite, but does little to nothing in the way of protecting the fuel system from corrosion due to the ethanol content.

As to the Honda tank, I doubt it's made of stainless steel. Stick a magnet on it and find out. More often than not, the magnet won't stick if it's SS. Sometimes, it does so but with a weak bond which is only due to the iron that may have been forged into the sheet material. But if it's a steel tank, the magnet will stick on it at full strength.
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Well so far, no rust or very little anyway and its outside 24/7 with just a thin weatherproof cover over it to stop the wet,, I'll do the magnet test next time I remove the cover..
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S
Eye Automotive lighting Motor vehicle Liquid Fluid


Here is the picture of my neighbor's fuel neck. Her receipt shows purchased June 7, 2021 (16 months) Picture of mine is the very first post and at about 7 1/2 months old. Both use E0 fuel and kept in garage, mine partially air conditioned and her garage has a dehumidifier.
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Colt Carson
Wow, those pics look rough. Mine looks brand new after 10 years, and I keep gas in mine year round. A magnet does stick to my EU3000's tank.
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S
I did contact Honda Monday via email and have a case number. And I did contact the dealer. The dealer said to wait till Honda responds but he also mentioned that he thought it was due to high humidity. My other unit was in the identical location 3 1/2 years in the garage and didn't have an issue; it looked pristine. I believe it's with the metal. The difference in serial numbers with mine and my neighbor's unit is about 2600 (last 4 digits) units. So I would assume at least all those units and most likely more would have the same tanks and same issue.
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pipe
Eu7000isnan assembled in India January 2021 and shipped via Seattle to the Keys 2 months later. Exposed to multiple storm / rain outages and stored outside.

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S
No indications of pitting or rust anywhere when purchased. Was in perfect shape when received and all issues came afterwards; bought mine February 2022. Is there a manufacturing date anywhere?
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Colt Carson
Hondas are built in India now?
I live in the Deep South on the coast, very humid during the summer with winds from the south. I keep my Honda in my garage, which is not climate controlled. I don’t know where it was built (hopefully Japan), but I’ve had it ten years. The little bit of brownish residue under the cap gasket isn’t rust, it’s some gasoline gummy residue.
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Colt Carson
pipe said:
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Mine says made in Japan on the generator. I wonder where Yamaha is making theirs.
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Colt, your inlet area looks real good. Haven't heard from Honda yet but if my unit deteriorates more, I'll be really concerned. If no recall, maybe sell it. Looking at the diagram of the unit, the fuel tank doesn't seem be a big deal to replace so that may be a consideration. But I thought that of other items on my car and ran into problems.

Pipe provided a great link to Taryl's test on additives and now I wonder whether any of them are of any benefit. Got to locate the one year test but from what he's done for several months with ethanol fuel, not an issue.
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Colt Carson
StormReady said:
Colt, your inlet area looks real good. Haven't heard from Honda yet but if my unit deteriorates more, I'll be really concerned. If no recall, maybe sell it. Looking at the diagram of the unit, the fuel tank doesn't seem be a big deal to replace so that may be a consideration. But I thought that of other items on my car and ran into problems.

Pipe provided a great link to Taryl's test on additives and now I wonder whether any of them are of any benefit. Got to locate the one year test but from what he's done for several months with ethanol fuel, not an issue.
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I have used Sta-Bil from the beginning, if that matters. I did use ethanol fuel for the first couple years, then switched to non-ethanol gas only.
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toy4two
StormReady said:
As a matter of background, I had my previous EU7000 for about 3 1/2 years and decided to sell it to upgrade to the current version with Bluetooth, etc. My previous unit was in pristine shape and no rust whatsoever and always kept in garage. I've had my current unit for just over 7 months. My neighbor also has the newer version, same unit but purchased about 1 year ago. When my neighbor asked for help with her unit, I also helped fill the gas tank. When removing the gas cap, there was a lot of rust on the fuel tank's rim where the cap connects. I thought that was very unusual for a relatively new unit and one kept in her garage. Also disappointed as I recommended the Honda unit to her. Then due to the recent storm, I too added a few ounces of fuel to the top-off level recommended in manual and noted the beginning of pitting (the beginning of rust) in the identical location of my neighbor's unit - the pitting/rust is under where the gas cap gasket seats to the fuel tank. Cap appears to seat firmly and snug in place so I don't think it's a bad gasket. My unit is also stored in the garage and partially air conditioned from house. I am totally perplexed as my previous unit didn't have any rust at all, was stored in identical location and have always used the suggested E0 fuel. Are there others that have the new version Honda EU7000is for over 7 months that have the same rust problem beginning? I'll get a photo of my neighbor's unit that will show terrible rust while mine appears to just be starting. I did coat the area with motor oil to hopefully slow down the rust.
Click to expand...
buy the VP Racing Mechanic in a Bottle at Home Depot and store it with that. It has oil and stabilizer in it. Will also dissolve any ethanol gummies while its sitting as a bonus! It runs fine in four stroke and very little smoke when the oil burns off on your first tankful in the new season
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toy4two
iowagold said:
watch the silicone as the honda eu7000is gen has a cat.
they now make drying socks for fuel cans.
wix makes them
pm if you need links.
darn fuel has water in it these days...
even at e-0...
i just checked clients Seperator filters for water on the e-0 tank...
one was full of water the other was 1/2 full.

i think it has to do with the moisture in the air getting sucked in with heating and cooling.

nitrogen gas blanket for the tanks?? just a thought...
Click to expand...
only buy 4 stoke gas at Home Depot or lowes or Walmart In power tool section not gas station ethanol blends
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Dutchy491
Dear toy4two, That’s totally cost prohibitive and impossible during a prolonged power outage, and certainly not necessary. Like many have advised before, find a non-ethanol fuel source in your area and use that in your small engines. Ethanol gas isn’t a big concern while actually running a small engine, but it’s what happens when ethanol fuel SITS in the carburetor for weeks upon weeks. So if using ethanol gas be careful what you do to store the equipment after the task is completed. Drain the ethanol gas from the tank, if not used in it’s entirety, and also drain the carburetor. Store the tank empty or re-fill with NON -ethanol gas and add a name brand stabilizer…😉
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OrlyP
E10 gas isn't absolutely useless. If you use the engine on a daily basis and you go through a tank of gas in about a week or two, there ought to be no issues having ethanol in the fuel.

It's when the equipment gets to sit dormant for anything longer than a couple of months is when the ethanol begins to really show its nasty side.
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Dutchy491
Yep I agree with that. I edited my post above to say “Ethanol gas” isn’t a big concern….
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S
Like I said Ive been using E5/E10 fuel for 3+yrs, always keep fuel in the tank and never empty the carb.. And I've had no trouble, I just make sure I run the generator monthly
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