Delaming outboard fuel line

iamsaws

Petty Officer 3rd Class
Joined
Aug 14, 2012
Messages
93
What are peoples thoughts on this?

I have a fuel injected 70 HP suzuki outboard. I have had an issue with it shutting down in 5000 + rpms. I finally took it off the boat and when I did I decided to cut the entire fuel line apart. When I did that I found a 2 foot section in the external fuel line near the primer bulb had completey cam detached and was floating loose inside the gray line fuel line. Would this be enough of an issue, so when the motor was really demeaning fuel would cut off the fuel supply? I found no real consistency to when it would shut off, only seems to do it when quickly accelerating or running at 5000+ rams for a period of time. I had tried a number of other fixes and never really found any clear indicators besides this issue. Little dumb on my part that I didn't try exchanging the fuel line, but it was fairly new and I don't run ethanol gas. Motor always started and idled and revved perfectly in driveway. Only does it under heavy load and high RPMS. So I am hopeful That a new external fuel line will solve this issue. Anyone have anything similar happen?
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
47,307
yes, that is an issue (and more common than you would think). get yourself a new fuel line.
 

GA_Boater

Honorary Moderator Emeritus
Joined
May 24, 2011
Messages
49,038
These new fuel lines with the ethanol-resistant lining are a pain. :blue:

I replaced my line with a brand new hose and bulb. The motor ran terribly and after going though carbs and fuel pump, finally checked for fuel flow through the hose. Turns out when I inserted the barb, a flap of liner was folded and all but closed off flow through the barb. Trimmed the hose back and couldn't stop the liner from wrinkling and choking the flow. I chucked the hose and used some 2 stroke oil to lube the barbs on another new hose.

That hose wasn't a cheap fix!
 

dingbat

Supreme Mariner
Joined
Nov 20, 2001
Messages
15,417
Let me guess...it's grey hose from a big box store.

That stuff is krap with a capital K. Buy hose from the reputable supplier and be done with it
 

robert graham

Admiral
Joined
Apr 16, 2009
Messages
6,908
Probably best to bite the bullet and invest in some genuine Yamaha factory fuel line....it's not cheap but it's good!.....
 

Sea Rider

Supreme Mariner
Joined
Sep 20, 2008
Messages
12,345
Had same issue with a Mariner grey fuel hose which had another internal sleeve, drove me crazy for some time. OB didn' want to rev higher, cut the hose at connector side and tiny pieces fell off hose, pieces were blocking fuel entrance to pump...shame on them!!

Happy Boating
 

robert graham

Admiral
Joined
Apr 16, 2009
Messages
6,908
Like I say, fuel lines are too important to buy cheap stuff....and the good stuff lasts a long time!...
 

Texasmark

Supreme Mariner
Joined
Dec 20, 2005
Messages
14,544
Had the same issue with 10 year old Mercury OEM hose, gray and slick, looked to be silicon material.
 
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