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The reason the outboard fuel line is grey in color is to keep it cooler which helps prevent vapor lock. It should be multi-layered, meaning that it has an inner layer that is resistant to ethanol fuel blends, an outer layer that is U.V. resistant, and a middle reinforcing layer for strength to prevent permeation. Quicksilver sells an excellent outboard fuel line. Silverado 4000 is another excellent quality fuel line. The black fuel line is fine under the deck where it will not be exposed to extreme conditions.

You weren't lying about the liner coming off and clogging stuff up. I'm very thankful for your video. As soon as I pulled the old hose off you could visibly see the liner wodded up to the fuel bulb. Thanks!

Thanks for the info on fuel lines! BTW you had a wonderful opportunity to recommend non-ethanol fuel for marine & small engine use.

Most new gray fuel lines have been upgraded and are ethanol safe. If you're still worried you can always still purchase ethanol-free gas. Multiple filling stations in my area sell ethanol free

Thank you so much. Exact fix for my engine. Tank and hose 20 yrs old. Been out twice all day no problems. I'm subscribed. You save my a lot of money and grief!!

There's probably no good reason to use USCG approved hose. I'm so glad that you are there to teach us about these things!

where I live we have 10% ethanol in all fuels in Pennsylvania . you can get ethanol free fuel at special gas stations for racing fuel and special motors and small engines not made for ethanol. the premium gas doesn't necessarily have less ethanol you have to test it .i put stabilizer in the fuel and disconnect fuel from motor and run it out so it does not gum up in carburetor

I got news for you. I make gasoline and blend gas for a living. Unfortunately with premium fuel we use ethanol to bring the octane up. We as refiners only make gasoline. We don't make premium or mid grade. We "blend" gasoline with alkylates and butane or pentane along with ethenal to reach the desired spark knock rating. So it is a big myth premium has less ethenal. It will have the same or more depending on the refiner and blend stocks available. If the crack spread is getting sketchy as in high prices your getting less true gasoline.

I'm glad you showed how to remove those factory hose clamps; that helped me keep the costs down when I replaced my boats gray fuel line.

Not all the "Grey" fuel lines have an inner liner, there are also black fuel lines that also have an inner liner that will degrade and fall apart over time. The only way to really tell is to examine your fuel line and see if it has an inner liner or not. If it doesn't have a clear or yellowish inner circle then your fine.

Bingo, i witnessed this the other weekend. I thought it needed fuel treatment. All that did was magnify the problem. It turned loose all the inner lining gunk and ran awful. Bulb got sucked flat because the motor was starved for gas. Thanks for the video. Cut the old hose and bulb to discover all the junk.

Good lord yall have 15%-85% ethanol in your non premium fuel up in Canada? That just sounds insane. We have no more than %10 in our gas but most of the newer gas/petrol stations have an ethanol free option. ive seen it offered in anywhere from 88-91 octane. They're proud of it, it's super expensive but i figure it's cheaper than rebuilding all my carbs in my outboards, mower, pressure washer etc etc basically anything carbureted! Love your vids!

Thanks for the video. I replaced with hose from autozone. Took test drive of 10 mile.. Ran like a bat out of hell and never a hiccup. I have a 2018 Deep V Proguide. The hose cost me $26 usd but now I'm not afraid of getting stranded.

Your right, I had the same problem with my Merc 4 stroke! I bought a black fuel line & bulb and installed on my fuel tank. I found pieces of the old gray in my filter and in the fuel tank..

You single handedly fixed my boat thanks !!!!!!!!!!!

New boat owner here of used Arima with a 90 hp Merc. Doing the water pump service. I can not get the lower off. Even with rubber mallet helping :). I had heard about chaining out my fuel lines. Where do I purchase a kit? Mercury? Amazon? Local Marine Supply? Not sure what is best. Thank you for great videos. I am learning a lot from them.

Ear fittings are great for fuel. I just switched over to this great fitting.

I'm tryin' to fix up a classic 28 hp McCulloch as a total boat newb so thanks for the great video!

use tiny screw driver to open the pinched area on the clamp and open it back up.. then just resmash it.. should have the special tool for those clamps. they close the clamps nice and neat like the factory

I thought gray lines are the only ones that are USCG approved to run above the floor in a boat (exposed to UV), as they are UV resistant. The black ones are fine for under the boat/covered, where they are not subject to UV and deteriorating? Or permeation.

thanks for your information I got the same problem went to new fuel lines now it runs perfectly

Did this yesterday to my bass tracker : ‘) and those good ol oetiker clamps love em things but certainly don’t have to have them on that line with the lower psi running thru.

Andy and i really enjoyed this video yesterday.. (kitchen tv) came back for another view and lay our comment lol.. you were very informative Roland.. i'm sure this will help many. 👌

Never thought of that. Always have to hunt down ethanol-free gas stations. Thanks for this fix. -Brad

Replaced my fuel lines with updated gray line w/o linning yesterday and fuel filters. My original line was lined but the issue for my engine is a bad fuel pump.

Thank you for your videos, but let us not forget that alcohol is an octane. Octanes purpose is to stabilize fuel from pre igniting.

That’s a great idea I never thought about automotive fuel lines that makes sense

Interesting. This is the first time I've heard someone say premium was better for ethanol content and that is a reason to use it in EVERYTHING. Premium is an octane level of gasoline not to mention whatever cocktail of detergents they choose to add. You use Premium because you want a certain octane level for the compression ratio of your engine. Using premium in a low compression engine is just wasteful. I find it kinda reckless to recommend people use premium to avoid ethanol since it has ethanol in it. If your concerned about Ethanol, buy Ethanol free gas which in my area is referred to as rec-gas or "recreational gas" and is only sold at stations that choose to. Rec gas will probably be a minimum of 91 octane so it will be good for your higher compression engines and you can let it sit in your carbs/engine longer without worrying about it absorbing tons of water and gumming up everything which happens after about a month depending on the environment. I use Rec-gas in everything but my daily driver because it eliminates a lot of the problems I've had with gas going bad in machines that sit for periods of time. It's too expensive for a daily driver IMO. But I make sure I fill my motorcycles up with it before I put them to sleep for 6 months every year. They are really killing us with this ethanol crap and I wish they'd find something better or ban it's use. It does more harm than good. Just my two cents.

I just did this same EXACT thing before seeing your video. My motor would run great then suddenly cut out for a second. I fixed some bare wires, checked the spark plugs adjusted cables, ect. When I was cleaning things up on the boat which is new to me I noticed the gray hose collapsing on itself in several places. I took the hose apart and noticed the plastic you mentioned which had broken down and was blocking the hose. I got the highest grade line I could for fuel injection systems and used regular clamps instead of this POS clamps that were on the gray hose. I haven't taken the boat out yet but will later. The bulb already feels 100 percent different. Before when you squeezed it it felt all squishy and half the time wouldn't re inflate. Not it works great with no issues. I'll update after I go for a ride.

Roland.... thanks for sharing 👍. I will be doing that this year before it goes into the lake 👍😊😁🚤

I recon you probably mispoke but, regular gasoline has LESS than 10% ethanol as per the United states laws. Premium fuel has the most or highest ethanol content. Ethanol is generally the main ingredient used as an octane booster to bring the straight refined stuff up to the 92/93 octane rating. Higher octane facilities higher compression ratios and higher revs equaling more fuel efficiency and ultimately more power. Grey marine hose is ethanol resistant and required in primer bulbs by the government.

Great information there Roland! We only use premium or ethanol free gas.

Very cool Roland. I can't believe they sell that hose that will break down like that.

Thank you I like the way you illustrate your videos and explain

Good info and on the subject of UV. UV destroys everything it hits....there is no known man made materials that are 100% UV resistant.

I used a dremel to remove the hose clamps. One of my grey hoses was packed with green crystal like substance. Didn’t look like the hose was deteriorating though.

I know exactly. My boat bogged down . Mechanic changed fuel line to black. A few hundred dollars but he figured out the factory had installed grey line. Now i know. 🇺🇸

I believe you are required to use US Coast Guard approved hose on all vessels.

I used a small thin butter knife to remove my same fittings. Fits under the tab

Very smart advice - question I find my reservoir too close to my feet in the boat. I would prefer if it was further up towards the front of my 14’ boat. Is it acceptable to extent the long hose to 6 or 7’ instead of 4’. And where do you buy the black flexible hose ?

Getting It Done North Of 7 (what is the size of the hose do I ask for? Thanks

If you think it makes a mess of Carburated engines , you should see the damage it will cause to all the Fine mesh filters on the fuel pump and presure releaf valve fine mesh returen filter inside the Vapor Seperator tank as well as the extremly fine mesh filter inside the nozzle of an E-tec injectors , this dissolved material will go right through a inline fuel filter in suspension then re-deposit on all the fine mesh filters down stream in the fuel system and is quite resistant to being cleaned by by anything but the strongest solvents. I am told they have redesigned the new lines to be more resistant ,I dont think its just Ethanol. But it is a real issue . the new fuels have a diffrent chemical package that really does a job on attacking the the materials used in all but the most resistant fuel lines , The automotive industry had to find a solution to this issue and thats why there lines can stand up to chemestry of the new fuels .

What size is the black automotive fuel line? Thanks for the video

Those are good looking hose clamps versus the old worm gear type that cuts into the hose. Where did you get them.

Well instead of looking up mercury fuel lines I will be looking up black automotive and replace them the same. Thank you. Hidden fuel filter and now lines before doing anything else since I got home from the bay.

What's your opinion on Fuel Demand Valves? I have a suspicion that mine is faulty. I want to replace my hose just like you suggest, but I'd like to leave the FDV out of it this time.

Have you put an external fuel filter in line, too? I have the same symptoms. It seems overwintering adds to degrade of fuel line.

Premium or regular gas is not an issue, you just want to get ethanol-free fuel ! As to the grey or black line, color is not a decisive factor, for safety sake, you should just make sure your fuel line is Coast Guard approved !

Great Video- information- AWSOME thank you 👍🏻👍🏻👍🏻

I would also add a water separator filter system

Don't forget to replace the fuel lines inside the motor,,mine were as soft as bubble gum,,when you went full throttle the would vacuum seal shut

I'm extending my fuel line for outboard. 3/8 gray above deck is what was recommended to me?

Can you make your hose that is 48 inches shorter? I have a great one now but I wanna switch and was just wondering?

How long does it take for this to happen?

Having the same problem with the liner in the grey fuel line, and I only use non ethanol fuel labeled at the pump. Sometimes I check, but not always. I use whatever octane gasoline that is available in non ethanol. I do use chevron marine additive as a cleanser and stabilizer. Premium gasoline only allows one to run a high compression, high performance engine. There is one advantage to running premium, that is the higher the octane, the more stable the fuel. 87 octane fuel will drop in octane at a faster rate than 94 octane. I would rather buy 87 non ethanol than 94 octane with ethanol.

What diameter is the feul line?

Stay at home orders yeahhh I'll do whatever I would like to do whenever I want 🤣🤣🤣

That happened to me awhile back

Hello, Great video my problem bogging is with a 1980's model, 90 hp Evinrude. It may be also a gray hose as well as the lenth and fuel pump diaphram.; Hmmm.... I wanted too put the 6gal gas cans under my drivrer and passengers front bk to bk lounge chairs. So I added about eight feet of 3/8 gray fuel line to achive this and that poor little dipharam work itself to death//;// lol I'ma gona try dos things; Uno shorten fuel line to and C if that fixes and or numeral dos: replace fuel line, filter and last but not least the Fuel Pump. Really my only real question is, Will the fuel pump deliver adiquite fuel for my 1980 16ft Ebko 90hp Evinrude wih an eight foot extended fuel line and should the primer bulb be a couple feet from the gas tank or the fuel pump, or does it really even matter:\ Thank you, Shane, Oklahoma Cityy s

Is true that the new gray fuel line no longer has the inter liner issue?

For the Europeans watching this. In Europe we have E10 at the pump. A maximum of 10% bio ethanol is added. You can also go for Euro 98 which usually doesn't have those products added. But in the US the standard fuel is a bit worse than in Europe.

Doing this very soon, now is the bulb ok to reuse or should I invest in one made for a vehicle

I got a 2 stroke engine. Should I run the fuel and emission line for $2 a foot or should I go with the feul injector line for $6.50 a foot?

I had to order a fuel connector kit for an old Evinrude I got second hand. When I squeezed the ball, the fuel leaked out from the end of the hose. I thought I needed a different size hose but I saw this adapter and the tons of comments from people who said it worked. I am going to try replacing it today but I wonder if anyone has heard of these issues with Evinrude or Johnson.

Don't assume that premium fuel has no ethanol, in fact in NY and other states only 91 octane premium fuel is ethanol free. If it's ethanol free it will be plainly marked as such. I personally use the ethanol free in all my small engines (motorcycle, mower, Harley Davidson, boat, etc) and my BMW. I also use StaBil stabilizer in all my gasoline except for my Nissan Xterra...

When a primer bulb gets hard from age can it be softened or does it have to be tossed? Some bulbs are quite expensive and it would be nice to get a few more years out of them.

How do you get air out after you do this

What size tubing?

What size fuel line, 1/4th?

Where do you get the black hose?...auto parts place?

Mine is a the same. Fuel starvation at full throttle going fine the dropping off the plane and struggling.

What inner diameter is that hose?

So it’s not a garbage hose you just have to run a certain gas through it sooo how it’s a garbage hose? Because I’ve had mines for 3 years no problem

Where I live premium has NO ethanol not 10%.

as a certified Outboard mechanic and a retired Coast Guard boarding officer, I do not recommend using automotive gas lines on any boat. All fuel lines on a boat should be Coast Guard approved fuel lines. Any marine mechanic using automotive fuel lines is asking for a lawsuit. There is a reason the Fuel lines on a boat have to be Coast Guard approved. Boat fires are not good. Think about it.

where did you get the fuel line?

next thing that will happen is your water flow will get blocked you have to pull the power head theres a rubber water line connector that swells up and shuts the water flow down then its limp home mode

I thought those lines were for the ethanol mixed line

You forgot to clean out the bulb.

I dont think the colour of the line is what was causing your issue I have grey lines and have no issues.

One good reason why you are running out of fuel is that you need to replace diaphragms in your fuel pump every year. If not, you will have issues like this. My father has been a marine mechanic for over 45 years and he has never had an issue with the grey fuel line causing an engine to run out of fuel. You better check your fuel pump my friend

Don't use automotive fuel line on a boat. Make sure it is USCG approved. Its different.

You lost me at beating a screwdriver with a hammer. I taught all my sons to use the proper tool for the job. A screwdriver is for driving screws period.

Do not buy the $40 kit at wally world junk Grey Chinese line ,junk Chinese ball.waste of money

There is NO ethanol in premium fuel