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Old 08-02-2012, 08:18 AM
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Default Replace those old grey Mercury fuel hoses!!

After reading the thread on "Rebuilt my fuel pump and found this!", I reasoned if his 2002 fuel hose was breaking down and shedding pieces of the internal lining, my 2006 hose would do the same eventually, so I replaced it today.
http://www.thehulltruth.com/boating-...ump-found.html

Again, this is the older Mercury grey hose with no external printing, replaced today with new Mercury B1-15 hose with blue printing along its length. The old hose was beginning to discolor, but was still very flexible. When I cut open the old hose, I found the liner was falling apart and just beginning to shed particles. Good thing I pulled it out when I did.

So, even in Michigan's cooler climate, those old grey hoses start breaking down in less than 6 years. If your boat still has that hose, get rid of it!!
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Old 08-02-2012, 08:36 AM
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could you possibly post a pic of the old and new hose please.. itll help some of us diagnosing
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Old 08-02-2012, 09:36 AM
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Here are photos of the old (above) and new (below) hoses. The old hose has no printing at all, came on a new Quicksilver portable fuel tank. The hose ends shown were freshly cut today- you can see the degraded liner of the old hose and the intact liner of the new hose.

Where the old hose had not been exposed to fuel, it was the same color as the new hose.
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Old 08-02-2012, 09:39 AM
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What is the life of a fuel line if ethanol is not involved? I just had the same problem with my boat and had to get new lines, new filters, rebuild pumps etc. The boat is a 06 and up until two years ago it had never seen ethanol gas. In the last two years it gets ethanol about 50% of the time.
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Old 08-02-2012, 09:41 AM
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Specifically the red lettered hose, which in that pic you can barely see.
Look to the far left end of the hose.
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Old 08-02-2012, 10:00 AM
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Good post....I had a $500 bill a couple of years ago from a Vapor Sep clean out to prove what crap the old grey hoses are!
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Old 08-02-2012, 10:02 AM
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Quote:
Originally Posted by yarcraft91 View Post
Here are photos of the old (above) and new (below) hoses. The old hose has no printing at all, came on a new Quicksilver portable fuel tank. The hose ends shown were freshly cut today- you can see the degraded liner of the old hose and the intact liner of the new hose.

Where the old hose had not been exposed to fuel, it was the same color as the new hose.
Is this the hose leading to the engine from a fuel tank, or the hose under the cowling from a fuel pump to carb? Can B1 be used under the cowling ?
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Old 08-02-2012, 10:21 AM
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Quote:
Originally Posted by Rick Hodgkins View Post
Specifically the red lettered hose, which in that pic you can barely see.
Look to the far left end of the hose.
Huh!! Thanks for noticing. Must be the camera flash that made that printing visible, because I cannot see it on the hose in daylight. Under the right artificial light, I can see it says this is ...CG Type B1 SAE.... I did find a place under a clamp, where the hose is not discolored and there is some red printing.

Just inspected the hose on another boat, a 2001 with original Mercury fuel hose. That is again grey Mercury fuel hose, more flexible than the new stuff I bought, not discolored and the red printing is easily visible. So, interesting that print is so faded on my 2006 boat (where the fuel hose is only exposed to light when I'm using the boat) and so visible on my 2001 boat (where the fuel hose is always exposed to light). Both motors get their fuel from the exact same source- my fuel cans. I'll be changing that 2001 hose, but it seems as if that is better hose than the stuff on the 2006 boat.

Maxie- this is the fuel hose between tank and quick-connect at the motor. Don't know the answer to your question about B1 under the cowl. Under the cowl of both motors, the fuel line is a black hose, so clearly a different product than the grey hose between tank and motor.

Last edited by yarcraft91; 08-02-2012 at 12:19 PM.
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Old 08-02-2012, 11:32 AM
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Most hoses under the cowl are molded and I would not substitute.
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Old 08-02-2012, 11:33 AM
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Thanks for posting this! I know there have been dozens of threads about ethenol's effect on the merc old silver/ grey hoses . Never realized it was on hoses as new as 06, my boat is an 07 and had a 2' section of grey hose going up to my kicker . Replaced it today and found at least a shot glass full of yellow chips in the system. The old line was full of chips as well as the filter that was changed last fall .

Thanks again
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Old 08-02-2012, 11:36 AM
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Update- pulled the old fuel line off the 2001 boat, That was a Mercury Marine hose labeled in red print. Cut it open, it still appeared to be in excellent condition. There was no apparent degradation of the liner, which was still adhered to the outer hose. No cracking or crazing of the liner, no discoloration of the outer hose, all the printing still very readable, hose very flexible. FWIW, the old 2001 hose had no SAE rating, the 2006 hose did have an SAE rating (number still illegible).

So, two grey fuel hoses, two very different outcomes. Some of those old grey hoses have no problem with the fuel that destroys others.

Last edited by yarcraft91; 08-02-2012 at 12:22 PM.
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Old 08-02-2012, 11:41 AM
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When I changed my fuel lines it looked like they had red skin peanut hulls in them. They were packed with the garbage.
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Old 08-02-2012, 11:51 AM
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Yes, thanks for posting this. I have an 04 merc so I'm sure mine doesn't look much better. Replacing this weekend.
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Old 08-02-2012, 12:20 PM
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I have the old style fuel hose on my 2002 Merc EFI. I've been meaing to replace them anyway but after reading this I ordered the new hose today. I'll report back as to the condition of the old one once I've made the swap.
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Old 08-02-2012, 01:23 PM
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Just a note for those of you planning to change fuel hoses.

The new 5/16" B1-15 hose was a really, really tight fit on the 5/16" fittings. A dab of oil smeared around the fitting and another smeared around the hose opening before attempting assembly makes the job easier.
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Old 08-02-2012, 06:44 PM
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Quote:
Originally Posted by Rick Hodgkins View Post
Most hoses under the cowl are molded and I would not substitute.
correct..they are... and are tough to replace with new standard hose because of the tight bends....but what do you do if those molded hoses are pre-ethanol?...they will degrade from the inside out just like the rest of the fuel system....the B1 hose conforms better than A1...but are they compliant under the cowl?
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Old 08-02-2012, 07:05 PM
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Most of the new hose says Ethanol rated right on it - doesn't matter whose - I replaced most of mine with BRP. I have a 94 EFI Merc and the hose under the cowl are NOT ethanol rated. I had a leak develope on my high pressure hose coming from the pump, the end had deteriated, kinda rotted like. The rest if it didn't look too bad BUT that hose has to be reinforced on the high pressure side (2) - just cut them the same length there short and won't go on if too long. The rest are standard hose but I am replacing all of them

replaced that old gray hose years ago when I switched over
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Old 08-03-2012, 02:32 AM
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I bought my boat in 2008 and after the first season I installed a racor before the second year to be sure my e10 gas survived the 3 month layup over winter and when I primed the filter I saw some of that stuff in the bowl. That's right, my lines broke down in less than a year.
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Old 08-03-2012, 03:18 AM
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The jury is still out on the e10 effects long term.
I have not seen any under the cowl hoses fail from e10 except a 70's Evinrude.
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Old 08-06-2012, 12:14 PM
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I'm wondering if it was a bad run of hose.

My inlaws bought my 05 pontoon boat a few months ago. I bought it new and it was always in dry stack and never saw ethanol. He just told me the fuel line was leaking and coming apart when he went to use it the other day. Same gray Merc hose.
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