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Breather pipe fuming - Cars & Trucks

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Engine worn out, is my guess with out any other details.

Posted on Jan 18, 2013

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My 1986 300ZX turbo is building up a lot of pressure in the fuel tank. If I leave the cap on, there is a long whoosh of gas fumes when I open it. What is causing this - and what is the problem if I leave...


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.

Aug 04, 2013 | 1986 Nissan 300ZX

1 Answer

Installing 40mm waste pipe over 7metres long, does it need a breather connection


Yes otherwise the water in the waste trap could be sucked dry and allow fumes to enter the room by the waste trap.

Apr 13, 2012 | Cars & Trucks

1 Answer

I have a 2000 beetle 1.6 petrol. When it warms up, the exhaust emits lots of blue/grey smoke. It is not losing any water. I have flushed and changed the oil. it needs 2 breather pipes which i will change.


would need a look iam afraid as it sounds like its sucking the oil fumes as it should into the engine but its drawing too much as a filter is missing in or around the breather pipe area ,either that or its just been hammered and now its needs new rings and a valve guides ,without a good look myself i honestly couldnt say

Apr 13, 2011 | 2000 Volkswagen Beetle

1 Answer

I get a petrol fume smell when i am driving


You have a leak, inspect very thoroughly, find someone with a good nose who can sniff around when you've stopped the engine.
Look around all the places associated with fuel, filler pipe, breather hoses, fuel lines and unions, fuel filter, any flexible fuel hoses, fuel tank and sender etc. Look for tell tale 'wet' patches. If it is very strong you need to find it as it is dangerous.

I hope I have been of help but please do not hesitate to ask if you have any further questions.
I appreciate your vote if you appreciate my reply.

Feb 28, 2011 | Fiat 500 Cars & Trucks

1 Answer

I have changed pcv valve twice and still getting oil in breather


The PCV valve does not control the oil situation, it just keeps the pans and valve covers from blowing off during a backfire. Excessive Oil in the breather is a result of excessive crankcase pressures, usually due to a worn engine, specifically rings.
SOME oil is normal, especially if you are loaded heavily and hard on the throttle.
There is a tester that measures crankcase pressures, but usually some other manifestation shows, like excessive oil consumption.

the PCV system draws crankcase fumes into the intake at idle and lower throttle situations. air going into the crankcase is filtered by the small PCV filter, where the oil shows up....

At highter throttle and lower intake manifold pressures, the system reverses, the PCV valve closes, and the fumes exit the crankcase VIA the breather filter. All of this is normal.

It costs tons less to periodically clean or replace the PCV filter.

Feb 13, 2011 | 1988 Ford Econoline

1 Answer

I have a 2000 volvo S70 i smell fumes in side car when driving went to get exhaust checked no problem there what can the problem be?


What type of fumes are they exhaust or oil burning.
Exhaust ..Idle engine and put glove on hand put hand over the tail pipe and if engine stops in 20 seconds then the exhaust is good if it keeps running then its the exhaust is your problem..
2 if ex ok then its due to the breather pipe on the engine and it should go back into the inlet manifold to be reburnt but if its not fitted or rubber hose split or broken then thats what you can smell.
So check out under the bonnet and see if you can smell or see any smokey fumes or sucking noise.
Can you see smoke when you start engine.
Let me know ASAP Ron

Nov 23, 2009 | 2000 Volvo S70

1 Answer

Fuel comes back out when refueling


EITHER your filling to fast or the breather pipe on the side of filler pipe
which lets the air and fumes out as you fill the tank .
Or the fuel in the tank is very hot which will also cause the same problem as you only use less than 1/3 of fuel the pump pumps up and the other is returned to the tank and after a run its warm fuel in there.

Oct 20, 2009 | 2005 Hyundai Elantra

2 Answers

Pressure is building up in engine and causing oil to blow out the filler cap. why is this


you need to check engine breather pipes these are common for clogging up

Aug 02, 2009 | 1998 Volvo S70

2 Answers

What does the breather pipe from the the engine overhead to the air intake unit actually do


Allows the intake of air so that the engine will run,By mixing air and fuel to a combustible level the internal combustion engine is possible,If you take away the air,you have a big gas pump,If you take away the fuel,you have a big air pump.

Jun 04, 2009 | 1990 Toyota Corolla

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