• GUESTS

    If You  want access  to member only forums on FM, You will need to Sign-in or  Sign-Up now .

    This box will disappear once you are signed in as a member.

  • Join In - We Share Fishing Reports & Outdoor Information Here

     
      You know what we all love...

      The same things you do!!!! Share what you love & enjoy in the outdoors as well as thank those whose posts you 'appreciate.'

      Have Fun!!!

  • 0
BIGFISH.JZ

Mercury Fuel Hose Causes Issues

Question

BIGFISH.JZ

I want to share some info that could save boat owners some headache and money. Before you hit the water this season please look at your fuel hose from tank to engine. If it's grey and doesn't have blue printing on it, you possibly have a section of the 10million miles of hose that mercury sold to all dealers in the late 80's- 90's with some still possibly being used in new boat rigging that falls apart internally. There is 3 types of lettering on merc hoses. Old hard grey with stamped lettering, soft grey with red print that fades quickly in the sun and stiffer grey with blue print. The soft hose with red print is the JUNK HOSE!!20170509_085449.thumb.jpg.0eefd7f667e8b980ed5346d54833fa8c.jpg It has a rubber liner that disintegrates and plugs itself up at connectors and plugs fuel filters and carbs with chunks or a light brown 'powder' that looks like fine sand but feels like rubber. Most repair shops will replace filters or clean carbs and send it home running great... Then the same thing happens... Over and over. If you have this junk hose remove it and cut it into 2" bits and dispose of it. Or give it to your brother in-law or father in-law if they have treated you unfairly. After installing new hose, flush system and replace fuel filters. I have seen this type of hose cause strange issues on over 100 boats. I can now, even spot it on oncoming traffic at 65 mph. I will loudly say it needs to be replaced but the other driver probably never hears my warning. It will last forever IF you ONLY use 91 non oxy but its not worth risking that NOBODY EVER has/will put cheap gas in the tank. It takes 2 minutes to examine and 10 minutes to replace. I recommend replacing it with black yamaha hose.

  • Thanks 1

Share this post


Link to post
Share on other sites

21 answers to this question

Recommended Posts

  • 0
Mike89

thanks!!!

Share this post


Link to post
Share on other sites
  • 0
Hookmaster

This may explain the issue that has plagued my Yamaha 1999 F100 for a long time. It's a Lund boat and a Yamaha outboard which I believed was rigged by the dealer. It stumbles at times in the 2500-3500 rpm range. Idles fine and WOT is good with an occasional slight stumble. Had the carbs cleaned and it ran great for 4 hours, then started doing it again. I'm pretty sure it's the soft grey hose. I'll check to see if has any lettering when I get it out of storage. Thanks for the post.

Share this post


Link to post
Share on other sites
  • 0
PRO-V

Hook, check for water in the gas also. Had that issue once and it acted like that.

Share this post


Link to post
Share on other sites
  • 0
BIGFISH.JZ

Water in fuel or 'phase separation' is the #1 running issue I see every year or day for that matter. I always tell people that nobody has ever 'saved money' by using the cheap gas in their boat. I ask people if they are buying 91 oct and they say "of course I am" Then they go inside to pay and ask where they can find 91 oct fuel. Carbureted yammies are the pickiest about running on mediocre fuel. I have driven my cars, trucks and Mercs thousands of miles on fuel that a 90's yamahas won't fire up on. I believe all boats should have a water separating fuel filter. The large yamaha (big blue canister) ones are about the best. From what I've seen in 20 years in the marine industry yamaha outboard motors are as reliable as any, but the 80 and 100 hp have had specific minor problems that have stumped the best techs I know... More than once. If I see an EFI Yamaha come in the shop, 99% of the time I grab some 10w30 and a 5gh(69J)-13440-xx (filter) and nothing more. I own 9 boats and zero yamahas because I have a great sense of adventure and live for the unknown! 

Share this post


Link to post
Share on other sites
  • 0
PRO-V

Bigfish, I have a '93 Pro 60 Yamaha. Run 91 non-ox and Ring Free. Never have had an issue. Wondering, in your opinion is the Ring Free a big help?

Share this post


Link to post
Share on other sites
  • 0
BIGFISH.JZ

The 91 is crucial, I'm gonna be explaining phase separation soon, the ring free is not as crucial but it is DEFINITELY beneficial. I think yamaha has excellent products and have done extensive testing and research. If they recommend that you use a product, its because the life of your motor depends on it. Not because they want another $20 for some snake oil. If used as directed you are gonna be very happy with the results. I realize that you can't 'see' the benefits but that doesn't mean it is not working. 👍👏👏👏🎣

  • Thanks 1

Share this post


Link to post
Share on other sites
  • 0
Hookmaster

I do have a water separating fuel filter on this boat. Maybe it's time to siphon everything out of the tank and start over.

Share this post


Link to post
Share on other sites
  • 0
BIGFISH.JZ
Posted (edited)

With the issue You're describing.... I would remove the filter and dump it in a glass jar. Let it sit a few minutes and examine to see if it is seperated into layers. If yes, siphon out and if you can access the fuel sender, remove it and use a rag taped to a stick to mop it dry. Replace fuel filter with new (filled with fresh 91). If gas looks ok and smells ok, I suggest new spark plugs. Look at wiring under hood to confirm tight corrosion free connections. I think plugs could be the culprit. Oh yeah... If you had it professionally winterized, they probably replaced the filter and it is probably full of 'shop gas' so take that into consideration.

Edited by BIGFISH.JZ
Properly winterized?

Share this post


Link to post
Share on other sites
  • 0
hitthebricks

It doesn't matter what brand motor you have,  what gas you use, weather or not you treat it, change them out within 15 yrs. the hoses fail and clog stuff up!  It is cheap prevention!

 

  • Thumbs Up 1

Share this post


Link to post
Share on other sites
  • 0
leech~~
1 hour ago, hitthebricks said:

It doesn't matter what brand motor you have,  what gas you use, weather or not you treat it, change them out within 15 yrs. the hoses fail and clog stuff up!  It is cheap prevention!

 

 

Good, point.  UV rays from the sun on a 15 year old plastic gas line is going to get brittle and crack up.

Share this post


Link to post
Share on other sites
  • 0
BIGFISH.JZ
14 hours ago, leech~~ said:

 

Good, point.  UV rays from the sun on a 15 year old plastic gas line is going to get brittle and crack up.

They don't make fuel hose out of plastic, leech, it would get brittle and crack up. The junk hose I'm trying to rid the world of, actually gets softer with age and from the outside it appears to be in excellent condition. Its difficult to convince people that they need a $50 replacement hose when they don't see anything wrong with the one they have, until I fillet it open and show them the loose rubber pieces inside. Mercury was aware of UV rays when they made this fuel hose, they didn't foresee the ethanol fuel that was coming soon to gas stations everywhere. Replacing your perfectly good (non red print merc) fuel line with the newer EPA approved hose and bulb required now, is terrible advice....

But that's just my opinion... I can fix it no matter what "improvements" you decide to perform in your driveway, its just money anyways. I wouldn't have any work to do, if every body listened to the professional advice of their friendly marine technician. I'd probably have to fish my life away then, but somehow I'm sure that I'll be buried in work orders again. 

Share this post


Link to post
Share on other sites
  • 0
leech~~
4 minutes ago, BIGFISH.JZ said:

They don't make fuel hose out of plastic, leech, it would get brittle and crack up.

 

Huum, seems like a brittle and cracked up hose made out of some kinds of plastics to me? 🤔

 

image.thumb.png.a9e7f3090cad03e658011ea2589cea74.png

 

The replacement hose on my Merc sure seems to be made out of one of the 10 or so different plastics used for fuel line  image.png.827ae13c134f1dd62d6b6965370906d6.png

 

Share this post


Link to post
Share on other sites
  • 0
BIGFISH.JZ

How bout this....?

"Quicksilver Fuel System components are are made of UV resistant materials and prevent hardening. All materials must meet Mercury’s strict engineering specifications for UV hardening resistance, alcohol absorption, fuel flow restriction and leakage. The result is a product that lasts longer and is more reliable."  Not my words, straight from the manufacturer! The pic I posted is me... The hose and liner are both super soft and even supple, even being caked in an oily skin from the environment it was in, just like the 100+ other junk merc hoses I have had the pleasure of destroying and replacing.

Share this post


Link to post
Share on other sites
  • 0
BIGFISH.JZ

I just found a few others who may or may not know what they are talking about...

"2018 · Is your fuel line from the tank to the motor a bright silver color with red printing on the side?? If so, put it in the trash."

 

"Optimax engines. The FIRST thing is to make sure you have the proper fuel lines. In older lines, the ethanol breaks down the linings and sends junk into the fuel system. At best you will have clogged filters, at worst it blows the engine. You must, must, must get the right fuel lines."

 

"Check your fuel line from fuel tank to motor. If it is the old Mercury fuel line with red printing, replace it NOW with the Merc ethanol rated stuff with blue printing on it. Replace the primer bulb too."

 

 "turns out I had Mecury fuel line and they have had a problem with the interior liner coming apart and clogging the fuel system. As soon as my mechanic saw the fuel line, he knew what it was." 

These are direct quotes from people who found out about this issue first hand!! 

I would never steer any FM readers or service customers in the wrong direction. I don't repeat info from just anybody with an opinion. I have literally spent more time in boats during waking hours, March through November, than I have with my feet on the ground!! I won't comment or advise, without 1st hand knowledge. But, believe what you want, but I have good sources and care about educating those who may benefit.

  • Thanks 1

Share this post


Link to post
Share on other sites
  • 0
PRO-V

Bigfish, how have Yamaha hoses held up?

Share this post


Link to post
Share on other sites
  • 0
BIGFISH.JZ
Posted (edited)

The only yamaha hoses that have been an 'issue' were the new 'quick connect' style they came out with years ago to please the EPA. The issue was that yamaha sent letters to all the buyers of motors equipped with these, saying there is a chance of the o ring failing and causing fuel leakage which, in turn, could POSSIBLY cause a fire. They recalled them but couldn't make/distribute new(old style) ones fast enough. We had customers that refused to use their boats until they got replacement hoses. I never saw one leak a drop. Then I would cut off the 'bad' ends from our pile of recalled hose and swap out the junk merc hoses with the yamaha hose. Usually, this was done by me FREE of charge to eliminate the hassle of contacting owner and explaining the problem. Dozens and dozens got free fix. So, the answer to that question is, they are excellent assemblies. They kink a bit easier than most and I've seen a few bulbs that were rock hard but I prefer yamaha hoses to any other.

Edited by BIGFISH.JZ
  • Thanks 1

Share this post


Link to post
Share on other sites
  • 0
BIGFISH.JZ

If anyone still has the round plastic push and turn connectors on their yamaha, you should be able to get free replacement from your dealer. These were on 2005 - 2007 (?) Small and mid sized yamaha 4 strokes. If you have junk merc hose that needs to be replaced, go to a yamaha dealer and ask if they have a recalled (used) hose you could have or buy cheap. Might save some money. It's worth a shot once you see price of cheap after market hose assemblies.

Share this post


Link to post
Share on other sites
  • 0
BIGFISH.JZ

This is off a Ranger with a PRO XS OPTI from opener that wouldn't run. Cost of repairs =$500!!0510190925.thumb.jpg.195bbe121ad80b47cbf6d88d2c9906a4.jpg

  • Wow 1

Share this post


Link to post
Share on other sites
  • 0
BIGFISH.JZ

IMG_20190607_114525608.thumb.jpg.b11a6970b9a40f80b077338230f94c6f.jpg

IMG_20190607_114510340.jpg

  • Thumbs Up 1

Share this post


Link to post
Share on other sites
  • 0
BIGFISH.JZ

IMG_20190617_145235065.thumb.jpg.77c84702965d9b520bd5a7cfe73064a4.jpgThis one WAS still in exceptionally good condition still.... replaced it anyways!!

  • Thumbs Up 1

Share this post


Link to post
Share on other sites
  • 0
delcecchi

Hmm, gotta take a look to see if they switched hoses when they put the Suzuki on my 98 Lund.   

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Answer this question...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.




  • Your Responses - Share & Have Fun :)

    • Wanderer
      @AlwaysFishing23 Sounds like some good ingenuity there.     I found the manufacturer of the unit I have in my 6 inch bit and ordered a new one During breakfast this morning.  Should be good to go.
    • eyeguy 54
      that can be nasty with no handle 
    • AlwaysFishing23
      I put my lazer bit on my dewalt brushless the other day with a homemade adapter (piece of pipe and a bolt) tryed it out the other day and was amazed, very smooth setup and since I have the max XR kit I have the nice lithium battery’s ( 2 and 4 ah) so I’m set for first ice drilling. Super light setup. Only downside is I don’t have a size handle for the drill so I just have to be mindful and not break my wrist. 
    • Horseshoe_Don
      Just checked the ice this afternoon and Shoe has 2.5" of ice and is 100% ice covered with some river current areas.  Summer access is no longer open.    I will be starting to ice fish as soon as I am done deer hunting in front of my house.    I predict a limit of walleyes first night out.     Don
    • Wanderer
      Saw those at Scheels in St. Cloud this afternoon.  Light!  The sticker shock blew back my hat a little but there’s always at least 1 significant upgrade to the ice fishing arsenal every year.  It’s not my upgrade yet but maybe later.  I was checking for a drill adapter for my new to me 8 inch Nils bit.  I like the 6 so much on the drill but sometimes I want an 8.   Anyone have an extra laying around?!
    • delcecchi
      Sounds terrific.   Having spent my career in the Tech field I am always cautious as to what startups are claiming.  But more power to them, I hope that they can achieve everything they are aiming for.    15 ms seems really fast.   It will be great if so.      Note, claiming a lot more than can be delivered is not limited to startups.    I have run into it many times inside an established tech power.     Fortunately, we are only like a half mile from the fiber on 24 so our DSL works fine...   Before that we had access.  Before that we had 26k dial up.     
    • CigarGuy
      Here you go. Took this on the way out of town today. Hopefully, you can zoom in on it!
    • eyeguy 54
      its nice and light.  sold other battery. deal with it. put 5.5 cans of soup in a plastic bag and lift it.  that's the difference
    • leech~~
      Not quoted numbers!  Lets see the whole unit with each on a scale pal! 🤨
    • chucker1101
      15 ms round trip from/return to space is what SpaceX is claiming now. Pretty impressive if it pulls off.   The issue with Hughes is the position of orbit of the satellite. Hughes satellites are in Geo-synchronous orbit with the earth, which means the satellite's orbit moves at the exact same rate as the earth turns. That way the satellite remains at relatively the same spot over the earth. The trouble with geo-sync orbits is that they are a long ways away. 22,500 miles, give or take. That's a long ways for a signal to round-trip. And there's not really a high-demand capacity solution.   The new constellation model of internet satellites uses a bunch, like say 4000, of really small satellites, about the size of a desk. These are in low-earth orbit, only 150 miles from earth by comparison. Capacity is handled by allowing satellites to share data between themselves. So if one satellite is overloaded, it will off-load data throughput to another close-by satellite via peer-to-peer communication. It's a pretty cool engineering model.   As you can probably tell, this is in-line with what I do for a living. But i am pretty hyped about the possibilities for people like us, who will never have optic cable strung to our remote location.