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Gray fuel lines and new gasahols

post #1 of 11
Thread Starter 
i was just told that if gasahol is being used in the gray colored fuel lines that they deteriorate in a few years; the white internal lining breaks down and buggers up the carbs; was told to change to a black colored fuel line. does anyone know if this gray / black line thing is true? thanx
post #2 of 11
I just pulled all the black hoses outta my boat. Now that they're dry, you can roll them in your hands and black dust comes outta them...rubber dust. My filters were clogged with this stuff. When it's wet with gasoline, it smears on your fingers like grease. I installed the grey Sierra "alcohol resistant" hoses at the recommendation of the outboard shop. They clearly state "alcohol resistant" on the hose.
post #3 of 11
Guy at the marine store showed me a fuel line with the interior tubing half eaten away. Some scary stuff...
post #4 of 11
I just replaced mine this past spring. The old hoses were hard as a rock and my hands were completely black after handling them. That's due to the boat being 25 years old and never having proper maintenance from the previous owner.. but I will start replacing my hoses on a more regular basis.
post #5 of 11
Thread Starter 
my boat mechanic friend responded to my question w:

So far I have not found one that does not turn gummy in a few years. When they seem to stick together/closed when I pinch them then I change them out.

he says to expect 3-5 years out of a hose w gasahol
post #6 of 11
Thread Starter 
They clearly state "alcohol resistant" on the hose.-----

my new 2008 OEM silver merc gas hose does not mention alcohol resistant on it; is it resistant? anyone know?
post #7 of 11
Thread Starter 
In the United States, the amount of ethanol allowed for use in gasoline is federally controlled by the EPA (Environmental Protection Agency). Based on these regulations, the current maximum allowable ethanol content in gasoline is 10%. In conjunction with this mandate, most outboard manufacturers – including Mercury Marine – have designed their outboards to tolerate up to 10% ethanol. Unfortunately, some of the fuel samples Mercury has tested that were taken directly from the engine’s fuel system have actually shown ethanol content as high as 30%, or three times the maximum allowable amount. This is most likely the result of phase separation that has occurred inside the boat’s fuel system (not necessarily from the gas pump having higher ethanol content).
Phase separation essentially means that the ethanol in the fuel has attracted water (usually already present from condensation and/or other sources) into the fuel mix. When the right amount of water enters the mixture, most of the ethanol and water will tend to separate from the fuel (into a different “phaseâ€) and drop to a lower level or layer inside the tank (water is heavier than fuel). If this layer of concentrated ethanol and water is drawn into the engine’s fuel system, significant damage can occur. Further, the level at which phase separation occurs is determined by a number of variables, one of which is the temperature of the environment. This may help to explain why some regions of the country may be more affected by ethanol than others. Mercury Marine believes this higher ethanol exposure has caused product failures in fuel system components on two-stroke and four-stroke product.
Ethanol has very different solvency behaviors than gasoline and is a proven contributor to the deterioration of certain rubber and/or plastic components and electrical potting compounds. Mercury is aware of this potential and is constantly working to implement material improvements to better withstand the effects of ethanol. One such improvement in place on all 75-115 hp four-strokes since 2006 and Verados since June 2007 (most easily identified by the polished chrome graphics package) is an improved float switch in the fuel supply module that ensures the integrity of the switch itself, even when exposed to higher ethanol concentrations. This change alone should address the majority of ethanol-induced product failures within the fuel system.
Mercury continues to monitor the ethanol situation worldwide and makes every effort to upgrade materials as necessary to ensure the continued reliable, durable operation of all of its outboard products.
For more information on ethanol, including what you can do to minimize its effects on your outboard, please review Mercury Marine’s comprehensive Ethanol FAQ document at
post #8 of 11
Color doesn't matter, what you need is a fuel line with a rating of "SAE 30R10" - the SAE rating is stamped on all fuel lines.

A line with a rating of "SAE 30R11" can handle 100% Ethanol.
post #9 of 11
Thread Starter 
super, wayne; thanx
post #10 of 11
What about all of the fuel lines inside of the motor?
post #11 of 11
Thread Starter 
Originally Posted by Topside2 View Post
What about all of the fuel lines inside of the motor?

see REVISTED response........
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