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General Category >> Rubber Side Down! >> Gas pouring out of air cleaner
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Message started by weberick on 07/15/06 at 13:14:02

Title: Gas pouring out of air cleaner
Post by weberick on 07/15/06 at 13:14:02

I have gas coming back through the breather tube into the air cleaner compartment.

Any clues as to why this might be happening. I turn the gas on, start the motor with the chock it run as normal and the about 5 seconds out comes fuel down the breather tube from the top of the motor.

Title: Re: Gas pouring out of air cleaner
Post by Steve530 on 07/15/06 at 14:10:52

Sounds like the carb is flooding.

When you wrote that you "turn the gas on", does that mean that you acutally move the petcock lever before you start the engine? These motorcycles have vacuum operated petcocks that turn off when the engine stops. So you shouldn't need to "turn the gas on".

Any chance you're turning the petcock to the "PRI" setting?

Title: Re: Gas pouring out of air cleaner
Post by weberick on 07/15/06 at 15:05:20

I think I am turning it PRI. That was the only setting I seem to get gas out of. But if it is vacum feed that may be the problem. So what position should it remain on. and please tell me what the 3 postition mean.

Title: Re: Gas pouring out of air cleaner
Post by Brewbrother on 07/15/06 at 15:11:37

weberick wrote:

The farthest clockwise turn is reserve.

Title: Re: Gas pouring out of air cleaner
Post by weberick on 07/15/06 at 15:20:49

Changed the setting and still gas POURING out of the air cleaner compartment from the breather hose.

Title: Re: Gas pouring out of air cleaner
Post by weberick on 07/15/06 at 15:23:25

I have tried the handle either @ 9:00 o'clock or 3:00. I'm assuming the 6:00 position is off.

Title: Re: Gas pouring out of air cleaner
Post by thumperclone on 07/15/06 at 20:37:23

there is no off .. handle straight down (6) is on, to the front of the bike(9) is reserve, to the rear(3) is prime..
good luck!!

Title: Re: Gas pouring out of air cleaner
Post by Steve530 on 07/15/06 at 21:28:53

Thumperclone is right. The long part of the valve "handle" should be pointing straight down. On my Savage, I think this is labelled "FUEL". Forward is "RES" and back is "PRI".

If you disconnect the gasline at the carb with the handle poited straight down, the flow of gas should stop. If you then crank the engine, the flow will start.

I understand that the petcock can fail. I have no experience with that failure, but you might do a search for that.

Good Luck

Title: Re: Gas pouring out of air cleaner
Post by serowbot on 07/16/06 at 00:08:05

Yes! Pet-thingy Can fail! I bought mine in bad running condition and it took me 2 months to figure it out.
To test if pet is bad, check for gas in the carb vacuum line (back of pet to right side of carb, usually smaller diameter than fuel line and chrome spring covered). Or cap both ends at carb and pet-thingy and set pet to prime.
If that is the problem, It's a $50.00 rebuild kit or a clever conversion to reserve-on-off from the tech section. (Many thanks to bobo383 for posting it!
)http://suzukisavage.com/cgi-bin/YaBB.pl?board=tech;action=display;num=1113631600

Title: Re: Gas pouring out of air cleaner
Post by weberick on 07/16/06 at 09:38:05

Because I had taken off the tank to check the float in the carb, the tank is just setting on the bike in a test mode. The vacum tube is not connected at this time which doesn't seem to make any difference with regard to my problem, gas pouring out of the breather tube either way. Would any of the screws on the carb have any effect on this. I had drilled out the plug in the one screw and made some adjustments as mentioned to stop the poping. The screw is set now all the way in and the bike was running, what I thought was fine. One day I parked the bike after a ride and the next day I started the bike and gas everwhere.

Title: Re: Gas pouring out of air cleaner
Post by Reelthing on 07/16/06 at 20:01:38

in addition to a not sealing very good float valve - sounds like the petc0ck has failed - when it does this gasoline goes both directions - into the air intake and onto the piston - change your oil as likely you now have too much - some of it gas - you will fry your bearings otherwise -

Title: Re: Gas pouring out of air cleaner
Post by weberick on 07/16/06 at 20:21:07

The gas is coming back into the air cleaner from the breather tube that originates at the top of the head.

Title: Re: Gas pouring out of air cleaner
Post by Keith_B on 07/16/06 at 21:51:00

:-/ is the whole engine full of gas all the way up to the valve covers?

Title: Re: Gas pouring out of air cleaner
Post by Reelthing on 07/17/06 at 05:10:20

wow - dont believe I'd start that!

Title: Re: Gas pouring out of air cleaner
Post by weberick on 07/17/06 at 07:06:48

I can start the bike and it runs. I've been testing and the bike will start up and run as long as you have bucket to catch the fuel coming out of the air cleaner.

Title: Re: Gas pouring out of air cleaner
Post by serowbot on 07/17/06 at 10:08:02

With the vacuum line not connected, you should only be getting gas on the prime postion (petc0ck lever towards you.) Fuel and reserve should be blocked by the diaphram in the petc0ck.
That's one problem.
You have at least two.
Since your not flooding through the vacuum line, you must bet getting it from the float. Check that the floats aren't filled with gas or stuck, if they are o.k. it's probably the float needle and seat. Could have a small foreign object blocking them. You may be able to clean them, if not replace the needle.
Good luck!

Title: Re: Gas pouring out of air cleaner
Post by Savage_Rob on 07/17/06 at 12:02:51

Reelthing wrote:

Amen!

Title: Re: Gas pouring out of air cleaner
Post by Keith_B on 07/17/06 at 12:47:51

weberick wrote:

The gas is coming back into the air cleaner from the breather tube that originates at the top of the head.

how can it be COMING FROM THE BREATHER TUBE FROM TOP OF THE HEAD unless there is gas in the top of the head [valve cover]?

Title: Re: Gas pouring out of air cleaner
Post by necropsy on 07/17/06 at 15:09:12

The breather/ overflow lines from the carb run up and under the tank. At least that's where I found mine from stock. When the carb overflows, it'll go where ever it can. Out the intake (and into the airbox), out the exhaust port (and straight into the engine, seeping into the oil) and out the carb breather tubes.

Title: Re: Gas pouring out of air cleaner
Post by Savage_Rob on 07/17/06 at 15:27:21

Keith_B wrote:

how can it be COMING FROM THE BREATHER TUBE FROM TOP OF THE HEAD unless there is gas in the top of the head [valve cover]?

I believe he meant it was flowing from the carb through the air intake into the airbox. I guess it's possible he has enough flow through to fill up his crankcase and come back through the breather tube. Either way, if it's been flooding that much, it's a good idea to change the oil twice after correcting the source of the flooding before running the engine.

Title: Re: Gas pouring out of air cleaner
Post by Keith_B on 07/17/06 at 17:41:21

I agree to change the oil a couble of times, once it fixed , I was thinking he meant the chrank case vent! :-/

Title: Re: Gas pouring out of air cleaner
Post by weberick on 07/17/06 at 20:21:19

Just so everyone knows. The gas is coming from the breather tube that originates on top of the head and terminates in the air cleaner compartment. Prooven by disconecting the breather tube at the air cleaner compartment and watching the fuel come out the tube.

Title: Re: Gas pouring out of air cleaner
Post by serowbot on 07/18/06 at 10:07:42

Believe it or not, it's just gravity.
Because the petc0ck diaphram is not shutting the gas off it is flowing freely down to the carb. The carb float needle is not stopping it so it flows on into every passage that's below the gas tank! The first place it finds to leak out is that breather hose in the air cleaner. If you blocked that it would run to the next place or fill everything up and turn your engine into a gas tank.
(i.e. Your engine is now a big bucket that's full up with gas! The first hole in the bucket that the gas can overflow from is the breather tube.) That's a lot of gas and could be dangerous!)
The breather hose is not the problem, it's just the place all that gas is ending up coming out. If the needle/ seat in the float bowl is sealing like it should, it will be impossible for the gas to get to the breather hose.
You need to fix the problem there and then get all that gas out of your engine BEFORE! you run it by draining your oil really well and putting new oil in.
One more thing... I think running with the carb's vacuum line not connected will create a vacuum leak. Air will be sucked into your engine from that hole on the carb into the engine. Recommend you put that line back on.

Title: Re: Gas pouring out of air cleaner
Post by keeef on 07/19/06 at 02:21:14

I had almost identical problem with my newly purchased 1987 Savage last weekend. Petrol had been dripping from air cleaner for a few weeks, so I stripped and cleaned carb (very dirty). When I re-started bike oily\petrol gushed from top of head breather hose!!

I have now sent carb to specialist for a rebuild and will let you all know what happens when it is returned.

My Savage has a Harley Sportster tank and K&N filter, so the vacuum hose from the carb is blanked off and the breather hose from the top of the head empties on to the rear tyre!!