Gas tank pressure pushing/sucking on fuel cap?? - 600RR.net
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post #1 of 12 (permalink) Old 09-23-2009, 06:49 PM Thread Starter
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Gas tank pressure pushing/sucking on fuel cap??

Recently installed a PCV so I had the bike more or less taken apart with my father.

Long story short, when I open up my fuel cap now (it's stock) the cap will either stick to it's track and have to suck back up (like a vacuum is holding it down) or it will blow off when I twist the key. I'm really perplexed and worried about this because I really can't think of what we did wrong.

Where would this problem be rooted? I'd imagine some sort of line is pinched from us assembling the bike back together, but does anyone know what this is exactly? I'm afraid to ride it after just filling it up and the damn cap blew off like a rocket, almost breaking my f%*#ing finger.

EDIT: I noticed my large rubber hose, which I assume is some sort of breather hose, doesn't hang as low as it did before dis assembly. Probably it?

93

Last edited by MachRider; 09-23-2009 at 06:55 PM.
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post #2 of 12 (permalink) Old 09-23-2009, 07:33 PM
 
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Check your vacuum hoses and make sure they are not plugged or pinched.. T




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post #3 of 12 (permalink) Old 09-23-2009, 07:48 PM Thread Starter
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Part #57 is what I was referring to about a hose, labeled as a BREATHER HOSE. It ends up down by the kick stand... what do you think? Weird thing is it just seems like an overfill hose to me since it goes to the tray around the basket and out the bottom of the tank via a slip-on male end to the tube- something that shouldn't take pressure well.

What would you say is the likely problematic hose, trip? Thanks for your help.

93
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post #4 of 12 (permalink) Old 09-23-2009, 08:15 PM
 
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57 goes to your fuel pump... I would pull your tank and check the hoses to make sure they are not pinched, this is probably the problem one got stuck when you lowered the tank down and now it can't vent and is building pressure in the tank.. T




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post #5 of 12 (permalink) Old 09-23-2009, 09:22 PM
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Sounds like a pinched breather hose to me too.

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post #6 of 12 (permalink) Old 09-23-2009, 10:03 PM
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i agree with everyone in the pinched breather hose. when it gets hot, pressure builds and needs to go somewhere as gas evaps.



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post #7 of 12 (permalink) Old 03-06-2013, 04:47 PM
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so what was the answer to this? i have the exact same problem i've checked the hoses and everything seems to be in order.
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post #8 of 12 (permalink) Old 03-06-2013, 07:03 PM
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Definitely the breather hose - I did the same thing when I installed my PCV. It helps to pull the hoses up then drop the tank, then pull the hoses back down to their normal position
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post #9 of 12 (permalink) Old 03-06-2013, 07:50 PM
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Pinched/clogged hoses for the win!!!

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post #10 of 12 (permalink) Old 03-07-2013, 01:54 AM
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Did u use diesel ?




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post #11 of 12 (permalink) Old 03-07-2013, 07:20 PM
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I work on new heavy construction equipment full time+ and had a guy put about 40 gallons of diesel in the hydraulic tank. The machines come to usa from all over the world. Dresta comes from polland and their dozers have the FUEL tank on one rear side and the HYD tank on the other rear side. He drove it off the trailer and because it was low on fuel he took it to the fuel truk like he was supposed to do but pumped the fuel in the wrong tank. Wasn't a good ending for Vladamir.

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post #12 of 12 (permalink) Old 03-07-2013, 09:36 PM
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Gas tank pressure pushing/sucking on fuel cap??

No diesel. The hose was too short to poke out by the kickstand on the armour bodies. I stretched it and zip tied it to the other hose seems to work for now. I messages some other people and one person said it was the gas tank seal from the top.


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