Pressure build in fuel tank - MVAgusta.net
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post #1 of 29 (permalink) Old 06-01-2017, 11:07 PM Thread Starter
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Pressure build in fuel tank

Today I was out riding in the city on my F4rr and when I pulled over to get fuel I noticed a large gap between my fuel tank and airbox. When I opened the tank I got an abnormally large release of air pressure and the gap immediately went back to normal. Later on that evening it happened again but this time when I opened the cap fuel blew out like a geyser since it had more fuel in it this time. Again the gap that preceded me opening went away.

I'm sure it can't be too hard for the people here to let me know what to look for. I was thinking maybe a blocked or pinched breather hose or something. Any suggestions are welcome.

Thanks,
DJ
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post #2 of 29 (permalink) Old 06-02-2017, 05:41 AM
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Look under the rear of the tank. There are two hoses that come out, wye together and then run down the left side of the engine to the ground.

Make sure that path is not blocked or kinked.

What is the last thing done to the bike before the issue arose?

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post #3 of 29 (permalink) Old 06-02-2017, 10:55 AM Thread Starter
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Hoping to look at it closely today but decided to remove some fairings in the meantime. I noticed that my coolant bottle is really low. Not sure if that is related or not. The bike didn't seem to be overheating but maybe running a little hotter around town than normal.
The last thing I had done to the bike was install a QD slip-on exhaust.

Thanks for the help,
DJ
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post #4 of 29 (permalink) Old 06-02-2017, 11:14 AM
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The coolant level should be low in the bottle.

Installing a QD slip-on should not have an effect on the tank vent.

Again, I would check the tank drain and vent lines to ensure they are not pinched or fouled.

Have you removed your tank for anything recently?

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post #5 of 29 (permalink) Old 06-22-2017, 09:52 PM Thread Starter
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Sorry for the delay in replying but I was away at work for the past two weeks and haven't been able to look at it.
So I hadn't had the tank off before. I checked the vent line today that runs to the small hole under the gas cap. I blew air into the hole and was able to feel air coming out of the hose that exits on the left side of the bike. I'm sure what other lines I should check.
I don't know if it would cause it but the bike was low on coolant. I haven't had the fairing off the bike for a bit and realized later that the coolant bottle looked practically empty. I have topped it up but haven't been out with it since.

Do you think low coolant could be a cause? I only had the problem running around the city and not on the highway.
I am also concerned as to why my coolant has gotten so low as well. I may have the dealer look into it but I'm trying to save myself some money by being able to point them in the right direction.

Thanks,
DJ
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post #6 of 29 (permalink) Old 06-22-2017, 11:43 PM
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DON'T FILL THE COOLANT TANK ABOVE THE "MIN" MARK !!!!!!!

It will just piss it out in front of YOUR back tire in left turns

If you have a MicroTec or remapped ECU set to turn the fans on at 85C/185F ignore this


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post #7 of 29 (permalink) Old 06-23-2017, 12:06 AM
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Quote:
Originally Posted by stickmandj View Post
Sorry for the delay in replying but I was away at work for the past two weeks and haven't been able to look at it.
So I hadn't had the tank off before. I checked the vent line today that runs to the small hole under the gas cap. I blew air into the hole and was able to feel air coming out of the hose that exits on the left side of the bike. I'm sure what other lines I should check.
I don't know if it would cause it but the bike was low on coolant. I haven't had the fairing off the bike for a bit and realized later that the coolant bottle looked practically empty. I have topped it up but haven't been out with it since.

Do you think low coolant could be a cause? I only had the problem running around the city and not on the highway.
I am also concerned as to why my coolant has gotten so low as well. I may have the dealer look into it but I'm trying to save myself some money by being able to point them in the right direction.

Thanks,
DJ
You have checked the hoses are free,thats good.
Have you had a look at the fuel cap itself that it is venting?


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post #8 of 29 (permalink) Old 06-23-2017, 12:20 AM Thread Starter
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Quote:
Originally Posted by mitchy View Post
You have checked the hoses are free,thats good.
Have you had a look at the fuel cap itself that it is venting?
Not sure how I check that...suggestions?

Thanks,
DJ
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post #9 of 29 (permalink) Old 06-23-2017, 12:22 AM
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Quote:
Originally Posted by stickmandj View Post
Not sure how I check that...suggestions?

Thanks,
DJ

This thread may help you-
It's an oldie but a goodie.




http://www.mvagusta.net/forum/20-mai...-question.html


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Last edited by mitchy; 06-23-2017 at 12:36 AM.
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post #10 of 29 (permalink) Old 06-23-2017, 10:29 AM
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After a couple of tries by the dealer to fix the venting issue that is just like yours, they removed the canister. Problem solved.

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