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Author Topic:   2005 Mercury FourStroke Fuel Hose
howlingdogsteve posted 03-28-2015 07:53 AM ET (US)   Profile for howlingdogsteve   Send Email to howlingdogsteve  
[What is the] size of the fuel hose that runs inside, front to back, on a 2005 Mercury FourStroke outboard engine?
jimh posted 03-28-2015 08:00 AM ET (US)     Profile for jimh  Send Email to jimh     
The inside diameter of fuel hoses usually varies with engine horsepower. Larger engines use fuel hoses with 3/8th-inch inside diameter. Smaller engine use proportionally smaller hoses. Most fuel hoses are marked with their inside diameter dimensions, so a close visual observation of the hose will usually reveal the information you seek.
howlingdogsteve posted 03-28-2015 12:06 PM ET (US)     Profile for howlingdogsteve  Send Email to howlingdogsteve     
Thanks for the reply Jim.
I should have mentioned 90 hp.
I did look rather thoroughly and could not find any size markings.
I'd like to not have to buy from a Merc dealer cause the original hose is pretty thin walled compared to others available.

blacksmithdog posted 03-28-2015 04:14 PM ET (US)     Profile for blacksmithdog  Send Email to blacksmithdog     
I replaced the fuel hose on my Montauk 170 with a Mercury 90 fuel injected 4 stroke. The hose that was on it from the tank on back was 5/16", and rated for fuel injection.
jimh posted 03-28-2015 05:26 PM ET (US)     Profile for jimh  Send Email to jimh     
While I cannot say this as being specifically applicable to your particular outboard engine, it is my observation on many well-designed outboard engines the fuel hoses used on the engine are often specialty hoses, not just some piece of generic fuel hose. These specialty hoses are pre-bent to fit into specific places in the rigging. If it is one of these hoses that you need to replace "inside" the engine--which I interpret to mean a hose that is under the engine cowling--then you probably ought to buy the OEM replacement hose in order to get the proper pre-bent hose.

If the hose is just a straight hose, then using a generic fuel hose is fine, but be sure to check the hose for being rated for tolerance of alcohol-gasoline blended fuels.

I have lost track of the many completely different engines that Mercury has called by the model name 90-HP FOURSTROKE. Is this engine you have one of the engines that is really a Yamaha power head? Or is it the petite-VERADO with no supercharger, AKA VERADITO four-cylinder?

jimh posted 03-28-2015 05:28 PM ET (US)     Profile for jimh  Send Email to jimh     
By any chance is the fuel hose in question that needs replacement the type that has a gray outer cover with a sort of metallic appearance? Those fuel hoses were often used with Mercury outboard engines. They are notoriously bad and cause many problems when used with ethanol-gasoline blended fuel.
howlingdogsteve posted 03-29-2015 09:13 AM ET (US)     Profile for howlingdogsteve  Send Email to howlingdogsteve     
The existing hose is not pre-bent, just a straight hose with a soft radius from the starboard to port side where it connects to the fuel filter assembly. It is black and appears to be single wall. I'm starting to wonder if it might be metric? [The engine] has a Yamaha powerhead and is EFI.
howlingdogsteve posted 04-07-2015 04:22 PM ET (US)     Profile for howlingdogsteve  Send Email to howlingdogsteve     
Blacksmithdog, where did you purchase the 5/16" rated for fuel injection hose?


jimh posted 04-07-2015 08:43 PM ET (US)     Profile for jimh  Send Email to jimh     
What are the specifications for "fuel injection hose"?
Robert V posted 04-08-2015 08:59 AM ET (US)     Profile for Robert V  Send Email to Robert V     
I recently purchased a new Mercury 60 HP EFI Fourstroke motor and the aforementioned 5/16" hose is correct. You can buy a 12' Quicksilver fuel hose kit, with primer bulb, from most online boat part retailers. The part number for the 12' fuel hose kit from Mercury/Quicksilver is 8M0061098. You can also buy 3/8" fuel-rated hose at most auto parts stores and West Marine, along with the fittings that will be needed. I chose the 5/16" hose because it was the size that shipped with the motor but, I think the 3/8" would have worked just as well.


Mike Kub posted 04-09-2015 04:44 PM ET (US)     Profile for Mike Kub  Send Email to Mike Kub     
Took my 1995 Yamaha C-75 in yesterday because it died from running 3/4-throttle. The C-75 would start again, but would die when given gas. I have new, blue hose, that is supposed to be ethanol resistant, but [repairer] said the lining can separate and collapse, preventing fuel flow. Time for tune-up, anyway, so [I] left it and will get the new hose he recommends (that he says costs $7-a-foot but will not fail).
blacksmithdog posted 04-12-2015 03:28 PM ET (US)     Profile for blacksmithdog  Send Email to blacksmithdog     
howlingdogsteve, sorry I just saw your question. I just got it from O'Reilly Auto Parts.

With regard to what makes it fuel injection hose, it's supposedly rated for a higher PSI.

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