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Blocked breather pipe on fuel cap

Blocked vent hole

Posted by Anonymous on


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 209 Answers

SOURCE: oil breather problem

keep your oil breather unblocked all the time's coz the pressure of it can destroy your gasket and oil seal.

Posted on Apr 15, 2009

  • 2418 Answers

SOURCE: Bike runs fine with tank off and separate fuel

The P-**** has a filter built in it, plastic screen type, remove the p-**** and check that for crud.

Posted on Nov 07, 2009

  • 2702 Answers

SOURCE: Truimph Trophy 1993, 20- 30 miles than engine cuts

yes that what it sounds like to me as well a blocked breather in the tank when the bike stops slowly open the fule cap and you should here a sucking sound as the air gets into the tank again find the vent pipe open the tank cap and useing comprest air blow it clean

Posted on Mar 07, 2010

  • 9 Answers

SOURCE: Trophy 900

Sounds more to me like you are boiling your fuel and vapor locking. I don't know how that bike is set up, but many bikes have one way vent to prevent fuel from spilling in an accident. Has the bike been apart lately? There is insulation on most bikes to protect the tank from excess heat. If it is removed the fuel actually begin to vaporize in the tank and won feed the carb properly.

Posted on Mar 07, 2010

  • 156 Answers

SOURCE: Fuel runs out the the right vent tube and breather

Most likely the diaphragm in the fuel tap has a hole in it .The way your fuel system works is that, when the bike cranks and starts it generates a vacuum in the inlet manifold, a pipe from the manifold goes to the fuel tap. The vacuum in the pipe pulls the diaphragm in the tap away from the holes in the tap ,letting fuel flow past the diaphragm and down into your carburetors ( gravity fed).
If there is a hole in the diaphragm the vacuum will **** fuel through the diaphragm and down the vacuum pipe flooding that cylinder and starving the others.
I hope this helps.

Posted on Mar 28, 2010

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Hi just on the inside of the pipe should be a small hole with a pipe goinig downwards that is the breather pipe . it sometimes get blocked and then builds up pressure try to clean that breather pipe and all should be ok. if you leave cap loose it can get lost and it allso could attracte alot of dust in the system over a time.

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When saw is running it dies unless i undo the vented gas cap then the saw will keep going is there any other way on other than the gas cap for it to vent or help breath? on a 372 xp

The vent on the 372 is not in the cat, it is situated on the right hand rear side of the fuel tank, the early vent was a black pipe pressed into the tank with a white ( vion ) plug in it, this can be pulled out by screwing a self tapping screw into the middle of it and pulling out with a pair of pliers, the later breather is in the same place but consist of a green valve pressed into the tank, it then has a black pipe conected to it which comes up into the crankcase and sits onto a nipple under the air filter, this can be pulled out with a pair of pliers and replaced, the later breather is very prone to blocking, due to CE law and gas escape from fuel tanks the breather is very fine.

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My problem is a come and go thing. At times i can get no more than 50 mph when this has happened I have noticed when I remove the fuel cap theres is a lot of pressure released or it is air taken in. It is...

The tank breather is blocked.
The tank needs outside air to enter as the fuel is pumped out, if this is not happening, the tank is pulled into negative pressure and this will prevent the fuel from being drawn at the correct rate.
The tank vent is a pipe from the tank which is then usually attached to the chassis and nothing else. It may have some form of vapour lock on the end to prevent gas fumes from escaping and forming a fire risk. This is the pipe that is blocked or the vapour lock is blocked. Locate it and remove it to clean it but DONT leave the vapour lock off the pipe when you refit it..
Some fuel tanks are vented through the fuel cap and don't have this pipe so check and make sure that the correct cap is fitted. You can also drill a very small hole through the top of the cap which may allow air to enter the tank although this is not advisable as there would be no vapour lock.

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When toilet is flushed the pump will continue to pump.

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yes that what it sounds like to me as well a blocked breather in the tank when the bike stops slowly open the fule cap and you should here a sucking sound as the air gets into the tank again find the vent pipe open the tank cap and useing comprest air blow it clean

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