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1998 Kawasaki Ninja 500 R not getting fuel from the fuel tank to the carburetors

How to hook up the hose to petcock can't get gas from the tank to carburetors. @

Posted by art burt on


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  • 126 Answers

SOURCE: gas runs out of from carburetor

if you suspect the float is stuck, grab a screwdriver and tap the carb float bowl with the handle. you should be able to see this from the bottom of the tank. hopefully this will unstick the float.

if it doesn't, then it will require removing the carb and taking the float bowl off and seeing if the float is adjusted properly.

Posted on Mar 19, 2009


Ned C Cook

  • 3433 Answers

SOURCE: 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.

Posted on May 21, 2009



  • 8 Answers

SOURCE: 1985 Yamaha xj700 Maxim- Carb. fuel lines

yes, the breather line hooks to the petcock on the line facing the back, the fuel line hooks to the larger one. the line from the breather is actually a vacume line that turns on the fuel, without it you will not get fuel out of the petcock unless it is in the prime position.

Posted on Jul 04, 2009


  • 16 Answers

SOURCE: 1980 gs 1000 fuel petcock has two connections where do they go?

On the one that has two hoses does it still have an "Off" position? Usually petcocks that have two hoses, one goes to the carb vacuum, and the other is for a fuel supply for the engine. That way it only allows fuel to flow when the engine is running. I have found these to be a poor design and can often leak and allow fuel to run into the engine if your carbs are acting up. If the replacement only has one hose, then it will work fine, just be sure to cap off the vacuum port on the carb.

Posted on Sep 24, 2009


  • 3 Answers

SOURCE: hose coming out of the bottom of the carburetor of

Probably just an overflow hose from the carb. If the float gets stuck or gummed up, too much fuel will go in the carb and come out, the hose routes the excess fuel away from the hot cylinders, etc and to the ground.

Posted on Apr 15, 2010

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Atv not getti g gas to bowl, new carb petcock lines new gas ?

With the pet **** hooked up and in the open position from tank and vacuum line attached to carburetor and fuel line detached from intake of carb and in clear bottle crank engine. Does fuel go in bottle while cranking. Pour a few drops of fuel into in sparkplug hole reinsert the plug and plug wire to plug hook fuel line back to tank and carb turn on ignition and crank in neutral of course.

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Scooter not getting gas to carb.

Silly question, but are you sure you are getting gas through the line? Could the line from the tank be plugged? How about the tank port?
Is there a fuel shutoff?

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Hooking up the gas tank the gas line to petcox the vac line to petcox what is the other line what do it go to this is on a 1982 gs650 suziki

The other line goes to the fuel gauge overflow right next to the petcock vacuum line on the tank. Big nipple on petcock goes to fuel line leading between carb 2 and 3. Small nipple on petcock goes to the brass nipple on the front of carb number 2. The other hose hooks up to the nipple coming from the fuel sending unit and routes down below the battery and ends. It's there in case the fuel sending unit leaks the hose will route the gasoline away from a hot engine instead of pouring out right on top of it. The nipple to the fuel sending unit should be positioned pointing directly at the petcock on the bottom of the tank. In case you don't know what I mean by sending unit it's the big round circle on the left side of the bottom of the tank with 2 wires coming from it.

Jan 29, 2014 | 1982 Suzuki GS 650 GT

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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.

Sep 05, 2011 | 2004 Honda VT 750 Shadow Aero

1 Answer

Seems to be a fuel problem, fuel not getting thru to cylinders but runs on easy-start (did this to eliminate poss. electrics problem) fuel tank full and switched on !!!

Don't use too much of the starter fluid. This stuff is bad on an engine as it can crack cylinder heads and pistons. Check the fuel petcock on your fuel tank. In 1996, Harley went to a vacuum controlled fuel petcock and they do give troubles. To check it, pul the fuel line off at either the petcock or the carburetor fuel inlet. Turn the switch on and spin the engine. You should see a good stream of fuel come out of the hose or the petcock. If not, check to make sure the vacuum line is hooked up to the backside of the petcock. If it is, you may have a hole in the diaphragm in the petcock. You must loosen the petcock and allow the fuel to drain out of the tank. Catch it with a large funnel and an empty fuel can. Take the petcock out of the tank and take the plate off the backside of the petcock. There's a needle and diaphragm under the plate. Notice how it comes out so you can put it all back together. Hold the diaphragm up to the light and gently stretch it while looking for a hole. You can get a replacement diahpragm from your local dealer. I'd much prefer to simply replace the petcock with a high quality manually operated petcock and plug the vacuum line. Of course, then you'll have to turn your gas on and off manually, old school style.

Good Luck

Jul 30, 2011 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

Working on a friends 81 yamaha 650xs. I removed and cleaned the carbs and put them back on but can t remember how the T hose from the petcock to the carbs hook up. Can someone help me

The petcock on these bikes is vacuum operated, which means that there are two hoses that go to it. The thicker hose is the fuel line and it runs from the thick port on the petcock to the fuel input on the carburetor rack. The fuel input on the carburetors is located between the number two and number three carburetor bodies. If you aren't sure which is the fuel connection, just turn the petcock switch to prime for a second and you will see gas come out of the fuel connection.

The thinner hose on the petcock is a vacuum line. It runs from the vacuum port on the #3 cylinder (between the carburetor body and the engine) up to the smaller connection on your petcock. When the engine is turning vacuum is applied to this thinner line and allows fuel to run from the tank into the carburetors.

There are the only two lines that should run to your petcock, and the fuel line should not be split anywhere between the petcock and the carburetors.

Good Luck,

Feb 24, 2011 | 1981 Yamaha XJ 650

1 Answer

Gas is leaking from the peacock valve under my gas tank seems to be coming directly from the bottom,what could cause this?

There's a gland nut that holds the petcock into the tank and pulls it up against the seal. Try tightening the nut. But, in all probability, it's the vacuum diaphragm in the backside of the petcock.

Harley went to a vacuum operated petcock in 1996 and they've been a pain ever since. The diaphragm gets a small hole in it and leaks gasoline or quits opening leaving the rider stranded.

Now, You can repair the petcock if you wish. Get a large funnel and an empty gasoline can. Loosen the petcock and allow the fuel to run out around the nut, catching it in the funnel and directing it into the gas can. Once empty, take the fuel line and the vacuum line off the petcock. The vacuum line is the small line on the backside. Take the petcock out of the tank. Look on the backside and there are four small screws. Take them out and carefully take the back plate off the valve. You'll see a diaphragm, a spring, and needle. Take the diaphragm and hold it up to the light and gently stretch it. You'll probably find a hole. You can get a replacement diaphragm from you local dealer. Reassembly is the reverse of disassembly.

Personally, I'd rather replace the vacuum operated petcock with a high quality manually operated petcock such as Pingel. The OEM petcock will fail on you and leave you stranded with a full fuel tank and an empty carburetor. The Pingle won't. Just install it, connect the fuel hose, and plug the vacuum hose.

Good Luck

Sep 12, 2010 | 2000 Harley Davidson FXDL Dyna Low Rider

1 Answer

Engine will turn over but will not continue to run

the fuel filter is in the tank on top of petcock that bike has a vacum operated petcock(fuelvalve)if the vacum hose is bad no fuel flow check the back of the fuel valve for a small hose that goes to the manifold make sure it is good put vacum on the hose wile hooked to the fuel valve and make sure that gas runs out of the hose give me a rate please hope this helps

Dec 13, 2008 | 1997 Honda VF 750 C Magna

1 Answer

Fuel petcock

The petcock is what the fuel flows through when it comes out of the gas tank. It probably includes: * A switch with positions for On, Off and Reserve. * A fuel line going to the carburetors. * A vacuum hose attachment which attaches to a carburetor which tugs on a rubber diaphram to let gas flow through. * An overflow/drip valve from the vacuum area. It's located right under the tank on the rear/left side.

Nov 10, 2008 | 2005 Honda CBR 600 RR

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