vacumn line problems under fuel tank - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 6 (permalink) Old 08-08-2011, 07:38 PM Thread Starter
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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.
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post #2 of 6 (permalink) Old 08-09-2011, 12:19 AM
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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.

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post #3 of 6 (permalink) Old 08-09-2011, 12:28 AM
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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.

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post #4 of 6 (permalink) Old 08-09-2011, 01:24 AM
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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.
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post #5 of 6 (permalink) Old 08-09-2011, 02:46 AM
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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.
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post #6 of 6 (permalink) Old 08-09-2011, 10:07 PM
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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
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