Question about 2005 Honda CBR 600 RR

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Petcock leaking took off gas tank alot of air build up in gas tank

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Repair or replace petcock then...Lol
As leaking gas becomes mixed it becomes a dangerous item as a spark will set it alight.

Posted on Nov 09, 2010

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Posted on Jan 02, 2017

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6 Answers

Pressure build up in gas tank Sporster


Harley Davidson has handled gas tank venting in a couple ways over the years. One is to allow the venting to be done by the gas cap the second is to have a non-venting cap and connect a vent hose to the tank which vents air from the top of the tank. You said your hose was dry rotted so it should be replaced. However, I don't feel that, by itself, would allow pressure to build up. Replace the hose and, while it's off, ensure the connection to the top of the tank is not plugged. When you put the tank back on, ensure the hose doesn't get crushed. It sounds like proper venting is all that is required.

Something else to consider is that a plugged vent would, most likely, cause a vacuum in the tank instead of pressure. (As the tank empties while riding, air can't come in to fill the space vacated by the gas.) The only reason I could expect that you build up pressure is if the vent is plugged and the tank gets heated from an outside source such as the sun.

I hope this is helpful.

Mar 26, 2017 | 2005 kawasaki EN 500 Vulcan

1 Answer

2001 Triumph Legend TT engine oil flooding with petrol


Hi, Malcolm you're getting ready to go riding you pull out the dipstick to check your oil level and are greeted with the unmistakable smell of gasoline. What happens next depends on the following:
1. You have experienced this before and do not start the engine but do change your oil and filter leaving it 1 quart low until the engine reaches operating temperature then top off as necessary.
2. The amount of time your bike has been sitting since the last time the engine was running.
3. The amount of gas and contaminants in the tank.
4. The oil pump location, exterior or interior.
5. The condition of your petcock gasket/seal/diaphragm.
If your gas tank was low and you start the engine probably nothing you would notice but if your gas tank was full and you start your engine the oil/gas mixture can blow into your air filter, come streaming out of your crankcase breather hose, and launch your oil tank cap followed by a blast of oil. The mess can be minor or you need to call a Hazmat team for assistance. This will also happen if you overfill your oil tank.
Next is the how and why gas can get into your oil tank/system:
a. The vacuum petcock rubber/diaphragm fails, which allows gas to flow from the fuel tank through the petcock, through the vacuum line into the intake manifold, then into the combustion chamber, where it seeps past the piston rings and into the bottom end.
3. Nonvacuum petcocks that are not turned to the off position will patiently wait until contaminants from the gas tank build up in between the carburetor needle and seat breaking the seal thus inviting gas to enter the combustion chamber eventually finding it's way into the bottom end and the oil tank.
4. Bottom line if you're not going to ride your bike for a while turn off the petcock.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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Triumph Thunderbird Service Manual
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Triumph Thunderbird Owner Manual

Jul 05, 2017 | 2001 Triumph Legend TT

1 Answer

THE PETCOCK VALVE ON THE BOTTOM OF THE TANK IS LEAKING. dOES THIS VALVE CLOSE IN THE MIDDLE POSITIION?


Normally a petcock valve is closed when the handle is PERPENDICULAR to the flow.

Example:

valve
=====----===== (Open)
valve
====='===== (Closed)

Sep 06, 2011 | Craftsman 15 gal Air Compressor 3 hp UMC...

1 Answer

I need to replace the o ring (petcock) on my 2004 honda shadow aero and need to know if i need to remove tank or maybe get special tool to remove petcock


Drain the tank. You should be able to remove the petcock by simply turning the nut holding it on or turning the whole petcock assembly. It may be stuck in place by the o-ring/fuel filter inserted into the tank. Be sure the filter is in place when you put the petcock back on or you will have problems with leaking gas out the carburetor overflows (from tank rust getting into the carburetors). Chances are the leaking gas is not form the tank sealing o-ring, but from the vacuum diaphragm assembly attached to the back of the petcock. Part # 5 on the microfiche.
http://www.bikebandit.com/houseofmotorcycles/2004-honda-vt750c-shadow-aero/o/m2881#sch407448

Sep 05, 2011 | 2004 Honda VT 750 Shadow Aero

2 Answers

Fuil in air box getting in oil dr200se year 2005 have carb soaking now olny 500 miles cant be worn may be the dry rot o ring in pet **** so far all the diaframs good in pet **** and diafram in top of...


What you are dealing with is a vacuum petcock with a bad vacuum diaphragm , in this case fuel is bypassing the petcock via the vacuum line and filling the engine (oil) with gasoline.
If you have a standard petcock that is leaking (not shutting off properly) or just left in the on position a stuck float needle will also fill your engine (oil) with gasoline. This can happen with a clean carburetor and a good float needle. It just sticks and you have to change your oil. If you have the kind of fuel petcock that allows you to turn it off when not in use , always turn off your gas when not riding.
You will have to change your oil if it is fouled with gasoline. I suspect a vacuum operated petcock is at fault. With standard petcocks I have seen new motorcycles in perfect order stick a float needle ( Kei Hin Carburetors ) and fill there engines and air boxes with gas/oil mix. On vacuum petcocks the diaphragm that shuts off the fuel flow is usually leaking and at fault.

Jan 01, 2011 | 2001 Suzuki DR 200 SE

3 Answers

Replacing gas cap caused pressure build up in tank


The tank has to be vented, you have a drain line on the overflow that allows air to come in, but it still has to go out, there is usually a tiny hole in the cap somewhere, He may have clogged some of the lines to the tank with the sealant, what did he use?? Most tanks have a map pasted on them where all the lines go, Find one and see what is missing or wrong, if you have to seal the tank, get it off, dry it out, wash it soap and water, get some POR brand tank sealer, works great, and pour it in there , follow their instructions, hope this helps.

Apr 24, 2010 | 1996 Honda VF 750 C Magna

1 Answer

GSF 600 SV 97 fuel problem


If the bike will run with the choke on then you have a lean fuel/air mixture condition. Most common cause is a vacuum leak or faulty pitcock. Spray some carb cleaner around the carb mounts with engine at idle, if the rpms change there is your leak.
Your petcock should have two hoses attached to it. One hose is the main flow to the carbs. The other hose is/should be a vacuum hose that allows the gas to flow (when vacuum is applied). When your petcock is in the PRI position, this will bypass the vacuum hose. Leaving it in PRI when motor off could possibly flood the engine. Check to see if that vacuum hose is attached properly with no splits or cracks near both joints. If all is attached properly your problem is the petcock itself. It has a diaphragm and 'return' spring. Weak return spring, clogged petcock, damaged diaphragm can all cause your problem. Also, after you recleaned and inspected the carbs, were they synched... if not, this needs to be done.
Good luck...i hope this helps..please rate me a fixya.

Sep 19, 2009 | 1997 Suzuki GSF 600 N Bandit

1 Answer

Leaking Fuel tap (petcock)


This sounds like a vacuum lock pet ****. 3 position? run, prime,and reserve? If you have it on pri, You will fuel running or not. If set on run, then you will only pass fuel when engine is running, and of course res. when tank is used up. Is this leak at the valve? or from the tank or internally flowing? Tis should also be a gravity feed fuel system, please correct me if I'm wrong. good luck. Long fuel lines are not prefered on gravity feed systems.

May 20, 2009 | 1986 Honda VT 500 C Shadow

3 Answers

Gas leaking from air box on 99 B12


there is not a off position i have a 1999 GSF bandit 1200 which i had the same air box gas problem. the positions are On, Reserve, and Pri. if its leaking back into the air box the petcock is not working correctly pull the tank off or disconnect the gas line and vacume line fuel should not leak out if it does the diaphram is riped replace the petcock. Also if you airfilter got soaked it needs to be replaced

Apr 14, 2009 | 1999 Suzuki GSF 1200 Bandit S

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