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General Category => Yamaha FJ1100 / FJ1200 Running Problems => Topic started by: Fallout_rain on May 26, 2017, 01:39:53 PM

Title: Hose/line routing
Post by: Fallout_rain on May 26, 2017, 01:39:53 PM
Thank you in advance for any help.

I'm having such a hard time with these hoses. Does anybody have a reference guide or could tell me off hand how they're routed. I've searched the interwebs and so many posts here. I'm sorry for the late question but I would really appreciate some advice.
I just rebuilt the carbs but of course forgot to take pictures of the hoses before hand.
I'm specifically talking about the hoses running off of the carbs.
Title: Re: Hose/line routing
Post by: FJmonkey on May 26, 2017, 05:50:16 PM
The routing in the posted image is correct. It is shown on the OEM air box, if you have one. The routing is not intuitive and often done wrong, myself included. With the hose going under, it lines up properly with the petcock when the last few inches of tank is lowered into position. 
Title: Re: Hose/line routing
Post by: Pat Conlon on May 26, 2017, 06:03:56 PM
Mark covered the fuel line... :good2:
In case you're asking about the vent hoses...
There are 6 hoses. 4 smaller choke vent hoses and 2 larger fuel bowl vents. (Each fuel bowl vent serves 2 carbs)
All are run between the engine case and frame at the back pointing to the ground.
In the case of fuel flow out any of the hoses (abnormal) you do not want fuel pooling at the top of the engine case.
Some folks merge the lines, but I don't do that. I like to keep them seperate lines and number them, that way when I get a problem with fuel flowing, I can know which carb or carbs are the culprit.
Don't kink the lines. They are vent lines. They either draw air in the choke circuit or equalize the air in the fuel bowls.

Hope this helps.  Pat
Title: Re: Hose/line routing
Post by: Mike 86 in San Dimas on May 28, 2017, 12:30:25 PM
(http://i1048.photobucket.com/albums/s361/anchondomichael/card%20routing_zpsj3qkfisw.jpg) (http://s1048.photobucket.com/user/anchondomichael/media/card%20routing_zpsj3qkfisw.jpg.html)

Here's a photo from my 86.
Mike
Title: Re: Hose/line routing
Post by: Mike 86 in San Dimas on May 28, 2017, 12:34:28 PM
Crap just found this photo I saved. OEM box is in the attic. Took the tank off for nothin :blush:
(http://i1048.photobucket.com/albums/s361/anchondomichael/20140802_145604_zps7ab9a793.jpg) (http://s1048.photobucket.com/user/anchondomichael/media/20140802_145604_zps7ab9a793.jpg.html)
Title: Re: Hose/line routing
Post by: Charlie-brm on May 28, 2017, 03:57:09 PM
(http://i1296.photobucket.com/albums/ag17/Charliebrm/Forum%20images/Carb%20hose%20routing_zps6gqyojjj.jpg)

Once I got "stranded" a few times within an hour after the first time I re-installed the carbs on my '84 I finally saw the light and never got it confused.
You're a lot luckier than I am if that's working. Mine always got pinched by the tank. Goz'under.

?? Maybe because with the Unipods there is more headroom for the petcock hose? I'm using Unipods now but it still goz'under. :)
Title: Re: Hose/line routing
Post by: Pat Conlon on May 28, 2017, 05:20:24 PM
I recall something about Yamaha having an incorrect fuel hose routing diagram on some bikes.
I think they had some sort of recall notice to dealers on this issue.

On my '84 the hose diagram shows the single line from the petcock running under *both* branch lines, and not under one branch line like Mike's diagram shows.

Wonder what the GFSM shows?

Like Charlie, I just know what works and what doesn't, learning the hard way. The oem fuel line is soft and when hot, it does not take much to kink it.


The harder aftermarket fuel lines are prolly less prone to pinching.
Title: Re: Hose/line routing
Post by: FJmonkey on May 28, 2017, 05:47:43 PM
I ran my '86 for many years with the line over with no issues. Then I started having fuel starvation issues and began the search for the root cause. I fixed the line routing but not the problem. Then I did the flapectomy with no improvement. Then did the suck test and found the petcock was failing. I opted for an 84/85 to gain the Prime feature and did not really care for the electric reserve function. That seemed to fix it till the problem happened again at a rally. Randy swapped out my fill cap and I had no issues that day. Randy took my fill cap apart and found the problem. The white plastic bit that holds the orange/brown flappers was put in upside down preventing the tank from venting. So I caused a problem to fix a problem and I fixed a problem that really was not a problem. The line routing is important, some have no issues but others have. It is a PIA when reconnecting the line to the tank but it makes one less thing to worry about.
Title: Re: Hose/line routing
Post by: balky1 on May 29, 2017, 01:28:34 AM
Quote from: Pat Conlon on May 28, 2017, 05:20:24 PM
I recall something about Yamaha having an incorrect fuel hose routing diagram on some bikes.
I think they had some sort of recall notice to dealers on this issue.

On my '84 the hose diagram shows the single line from the petcock running under *both* branch lines, and not under one branch line like Mike's diagram shows.

Wonder what the GFSM shows?

Like Charlie, I just know what works and what doesn't, learning the hard way. The oem fuel line is soft and when hot, it does not take much to kink it.


The harder aftermarket fuel lines are prolly less prone to pinching.

My diagram is the same like yours. Under both lines. I ran it that way and over both lines, never had a problem. With OEM or aftermarket hose.
Title: Re: Hose/line routing
Post by: mr blackstock on May 29, 2017, 02:43:40 AM
G'day,

I cracked the sads with my fuel line routing very early on, decided to go my own way, and after a few years has remained problem free.

(http://fjowners.com/gallery/2/1121_08_07_11_5_25_08.jpeg)
Title: Re: Hose/line routing
Post by: SausageNips on June 01, 2017, 05:21:54 PM
Where does the fuel filter go on this setup?
Title: Re: Hose/line routing
Post by: big r on June 01, 2017, 05:38:26 PM
What year are you looking at. The early models 84 to 87 or 88 did not have filters. Someone will correct me if I am wrong but I think the only models that had a fuel filter were the ones with a fuel pump Big R
Title: Re: Hose/line routing
Post by: SausageNips on June 01, 2017, 05:55:55 PM
Yeah, I think it was added after the fact.  Should I not have one?  I have aftermarket filters (no box)
Title: Re: Hose/line routing
Post by: FJmonkey on June 01, 2017, 06:07:49 PM
You only need to remove it if you are having problems with fuel flow. If you keep it, then keep a spare under the seat. Or a way to bypass it if you get stuck on the road. The problem will be when the filter is clogging and fuel level is low. Not really the best time. I would remove it and go Commando.
Title: Re: Hose/line routing
Post by: mr blackstock on June 02, 2017, 05:09:08 AM
G'day,
I have my fuel filter at the far left in the picture.  I have two inches of pipe coming off the petcock, then the filter.  When I lower the tank the filter sits in the depression on top of the air box.  That is the only place I could put it without fouling something else.  If you want a close look: https://www.youtube.com/watch?v=0VvnXuv16Yk&feature=youtu.be (https://www.youtube.com/watch?v=0VvnXuv16Yk&feature=youtu.be)

If you decide to use one, make sure it is bike specific and not a car one.  many people would suggest you do not need one, but I guess it is up to you to weigh the pro's and con's.

Cheers, Gareth
Title: Re: Hose/line routing
Post by: Rich on June 13, 2017, 04:31:32 PM
Gareth - where did you get your filter from? I'm looking for one for my 1100 but the one I bought is much larger and I'm having trouble fitting it under the tank.
Title: Re: Hose/line routing
Post by: FJmonkey on June 13, 2017, 04:41:40 PM
Welcome Rich. Do you NEED a filter or just want one? It will cause you problems as the filter becomes clogged. So be aware of this and change it often or keep a spare (or bypass method) on the bike so you won't get stranded by $4 part.
Title: Re: Hose/line routing
Post by: Tor-King on June 13, 2017, 09:26:11 PM
Quote from: big r on June 01, 2017, 05:38:26 PM
What year are you looking at. The early models 84 to 87 or 88 did not have filters. Someone will correct me if I am wrong but I think the only models that had a fuel filter were the ones with a fuel pump Big R

Hey, Big R!
The '88 (Canadian model), '89 in the US was the first year with a fuel pump.  It is located under the tank, mounted to a metal tab.  I believe you are right about the earlier models not having a filter as it would probably restrict the flow to the carbs being gravity fed.

Dean
Title: Re: Hose/line routing
Post by: Rich on June 14, 2017, 01:27:03 PM
I fitted a filter as I was getting engine faltering and cutouts. I probably caused it when I took the tank off to clean up the frame. The first time it happened, I cleaned the pipes and got it started again but after a few miles the same thing happened. I've now had the carbs cleaned and have managed to fit a filter, although it was a bit of a squeeze.
Title: Re: Hose/line routing
Post by: FJmonkey on June 14, 2017, 02:47:58 PM
Rich, your first post is the top of the page on this thread. If you have not already, please review the first page from the the top. Fuel line routing is critical on the '84/'87  gravity feed models. I had it wrong on my '86 for years. I was lucky and had no problems but others have to great frustration till they figured it out.