Question about 2005 Yamaha Road Star Midnight Silverado

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Too much negitive pressure in gas tank

There is so much negitive pressure in my gas tank that it is sucking my gas tank and causing the tank to **** in and it made a dent in my tank. Also the gas cap is extremely hard to remove

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Wat kinda bike u got. if a dirtbike, u need to check and clean the inside of that hose that comes out the top of a gas cap, thats the only place were air can get it in to let the pressure out and regulate the gas going in. if its a street bike ask sumone else i dont **** with that ****

Posted on Feb 02, 2009

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This is a Kawasaki 650 sr 1978,how I know or why the gas from the tank dosent get to the carburators,the problem is in the gas valve or in the sender sensor tank?


ok they have a prime position, the machine needs to be on prime and turning over, it works from motor sucking or blowing air from carbs to the tank, so does the on and reserve, there is no off on those bikes, it sucks i had them, the tank valve can go bad as well and leak gas!

Feb 02, 2015 | kawasaki Motorcycles

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How to empty gas tank


Pull gas line from gas tank to carburetor/injector/throttle body.

If carb, turn on petcock, allowing gas to flow into a gas can.
Remove gas cap to improve/increase flow.

If injected, turn on ignition to cause fuel pump to turn on, flowing fuel under pressure into gas can.

Oct 28, 2013 | 2011 Aprilia SR 50 R Factory

1 Answer

My gas tank is building up excess pressure when the bike is on for a while or after riding only short distances. This causes a high pitched squeal when the pressure gets too high. If pressure is not...


G'day.
The tank is building up too much pressure because the pressure relief valve in the gas cap is blocked.All gas caps are vented-(otherwise the tank has to be somewhere- like on Canadian models with fuel evaporative systems on them).
clear the blockage or replace the cap & you should be fine.
Under most roadbike gas caps is a cover held in place with two screws-remove them to dissasemble the cap & clear the blockage in the cap vent
If yours is a Canadian(maybe US models are the same)-model then the problem is in the fuel evaporative system. Check out this link.
http://www.mrcycles.com/fiche_section_detail.asp?section=365110&category=Motorcycles&make=KAWASAKI&year=2005&fveh=8485

Hope this is helpfull.
Kind regards Andrew Porrelli

May 17, 2011 | 2005 kawasaki EN 500 Vulcan

1 Answer

I am only getting 150 miles on a tank of fuel on the hi-way.


I believe the full dress HD's have a phenomenom of gas fumes from the end of the mufflers get sucked back into the area behind the fairing where the driver is. My theory is that there is a slight low pressure area there that causes the issue. I have noticed this on my HD in certain conditions as well, not all the time, just once in a while.

May 31, 2010 | 2000 Harley Davidson FLHTCUI Electra Glide...

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

Bandit idles HIGH when hot Just bought the bike! My bandit 1200S, 1997, runs smoothly when the engine is cool. But at hot temps when the bike warms up, the idle increases to 3000rpms. It doesnt want to...


OK.... firstly change the fuel cap, the tank needs to be vented correctly so pressure will equalise. Normally a rich fuel concentration will cause the engine to die not run high. From what your telling me it sounds like the throttle cables are not adjusted properly, if they are too tight the rpm's will not come back to idle. if this is the case you might be able to twist the throttle the opposite direction to lower the revs at idle. For the excess fuel problem, it could be what you say about the fuel cap, another thing will be the Needle and Seat might need changing or the float levels are not adjusted correctly. Whilst your there fit a good inline fuel filter, it will stop problems in the future.

Nov 12, 2009 | 1997 Suzuki GSF 1200 Bandit S

1 Answer

Egnition system wiring conrtol. had it started then ran out of gas so got gas and tried to start again but wouldnt start.


Do you know if you have to prime the fuel system to get it to flow? You can try blowing in the tank to pressureize the system. Try pulling the gas feed line at the carb to see if fuel is getting to the carb. If so, double check to make sure there is spark. If there is fuel to the carb and spark, its possible you may have sucked up some debris from the bottom of the fuel tank and now the carbs need to be cleaned. If there is no spark, you will have to chase down the ignition system, I would start with the spark plug cap and wire.

Jun 16, 2009 | Maico 250 Enduro Motorcycles

1 Answer

2002 roadking flhrci starves for gas


Hi there , ok, sounds like your tank is not breathing properly, Check that the petrol cap seal is sealing properly , check your fuel valve and hoses and make sure they are not touching the motor anywhere, most bike operate better with the tank in not in a vacuum so make sure that the breather holes underneath are not blocked , the reason why this phenomena happens is because when the tank is full , the shear weight of the fuel forces it to come out in abundantly which satisfies its request for fuel when you nail it, once the weight is lowered so is the pressure and the fuel has no air to replace itself because the breathers are not sucking in enough air to allow the fuel to flow .

May 11, 2009 | 2000 Harley Davidson FLHR-FLHRI Road king

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