vacumn line problems under fuel tank - Triumph Forum: Triumph Rat Motorcycle Forums
Thunderbird Cruiser Chat Cruiser chat for the the Thunderbird twin

LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old 08-08-2011, 07:38 PM Thread Starter
Production 125
Main Motorcycle: 2010 Triumph Thunderbird
New Member
Join Date: Feb 2011
Location: Massachusetts
Posts: 10
Other Motorcycle: Norton Commando
vacumn line problems under fuel tank

Has anyone had any problems with the vacumn lines coming off under the fuel tank above the heads? I've had them come off during down shifting and engine breaking...this in turn causes the bike to not want to idle and stall. The engine light subsequently come on on the instrument gauge. I've clamped them but it's happened a few times and the bike backfires as a result. I talked to the dealer in my area in Halifax Massachusetts and they said they had a couple people call them about it but so far no recall notices out there.
madpaddy1 is offline  
Sponsored Links
post #2 of 6 (permalink) Old 08-09-2011, 12:19 AM
Main Motorcycle: TB 2010
Senior Member
Ray548's Avatar
Join Date: Sep 2007
Location: California
Posts: 373
Other Motorcycle: BA 2007
Extra Motorcycle: Shared Bonn 09 w/daughter
I had it happen about 1 1/2 yrs ago, no problem since then. The dealer took care of it and tightened everything up good, I hope. So far so good.

San Fernando Valley, Calif
Ray548 is offline  
post #3 of 6 (permalink) Old 08-09-2011, 12:28 AM
Grand Prix 250
Main Motorcycle: Triumph Thunderbird 1600
Baltothunder's Avatar
Join Date: Oct 2009
Location: Baltimore MD
Posts: 80
Other Motorcycle: '83 Honda Magna VF750C
The backfire is what causes it. The explosion coming back into the injector bodies pressurizes the lines and causes them to blow off. Mine will do it on start up from time to time.

Reconnect everything and do the 12 minute tune. Solves the backfire problem 9 times out of 10.

2nd Officer Harbor Chapter #215 Southern Cruisers Riding Club
Never take for granted what you have been given, and what you have earned....
Baltothunder is offline  
post #4 of 6 (permalink) Old 08-09-2011, 01:24 AM
Supersport 400
Main Motorcycle: 2011 Ducati MTS 1200ST
Nikko's Avatar
Join Date: Jun 2010
Location: Akron, OH
Posts: 84
Other Motorcycle: 2010 Triumph Thunderbird
Been there, done that...

Mine happened when I stupidly put the bike in gear with the kickstand down. The symptoms were EXACTLY like you described.
Dealer fixed it, never a hint of the problem since, over 5,000 miles later. The engine design is SOLID!!! They were put on sloppily at the factory but it's NOT a design flaw, just a "whoops" at the production stage.
Nikko is offline  
post #5 of 6 (permalink) Old 08-09-2011, 02:46 AM
Join Date: Jun 2005
Location: L.A., Ca.
Posts: 9,598
They're talking about the small hoses that attach to the map sensors. they are a biotch to get to if you do it the regular way, IE: remove or lift the tank, then a mess of a wiring harness and just a real pain. But over at the other forum someone showed how you can do it w/o removing anything by just going under the tank ! If you know what to look for should be pretty easy since the hoses are attached UNDER the map sensors, so they are naturally going to be easier to get to from below. I just never thought to look. The only issue according to the thread is when the engine is hot you obviously are going to cook your arm on the valve cover a bit. But the person who started the thread said it happened to him on the road and he was able to re-attach it just by reaching under the tank. This is good news because when i had to do it the process turned into a major PITA that took a hour or more with all the [email protected] i ran into. Wish i'd thought to try this !

Last edited by dazco; 08-09-2011 at 02:48 AM.
dazco is offline  
post #6 of 6 (permalink) Old 08-09-2011, 10:07 PM
Supersport 400
Main Motorcycle: thunderbird
Join Date: May 2011
Location: western australia
Posts: 88
I got the right hand one on without lifting the tank the second time it happened beacuse i knew what to look for after lifting the tank the first time . I noticed it seemed to be routed wrong which was sort helping it to come off so i pulled it right out (but not off the injector body) threaded it a slightly different way so it sit up under the tank and because of the curve of the hose it wants to push it's self on now. I did put a dab of silicone to help it stick just in case.The left one would be harder without lifting the tank i reckon. And yes wait for it to cool down or you will get the hickey
wallacej is offline  
Sponsored Links

Quick Reply
All posts must adhere to Forum Rules

Register Now

In order to be able to post messages on the Triumph Forum: Triumph Rat Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter your valid email address, that can receive an automated confirmation message. Otherwise, you won't be able to gain full access.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuel line and Gas tank skos Sprint Forum 7 04-26-2011 05:01 PM
Fuel tank fuel line size jjimmydutch Air Cooled Twins Technical Talk 5 06-18-2010 01:55 AM
Fuel line came undone from tank spigot when lifting tank for battery removal sodapop Sprint Forum 1 01-30-2010 11:17 PM
vacumn line connection question ricster Sprint Forum 26 07-07-2007 05:57 PM
Sprint ST Fuel Line Question (fuel tank to/from fuel rail) Sprint Forum 7 01-26-2005 10:23 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On

For the best viewing experience please update your browser to Google Chrome