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Re: No fuel from tank
Take a clean piece of fuel line and slide one end over the fuel fitting on the carb, and try to blow gently through it. if you cant blow through the line, then you have a problem with the needle/seat assembly inside the bowl of the carb. remove the bowl, and pull the float out along with the small needle under it, and make sure its not stuck, and make sure that the bore that the needle slides into is clean. also, re assemble the float and needle, and check for float adjustment. with the carb upright, check that the needle moves freely along with the float, and isnt pressed shut when the float is at its lowest position. if needed, then bend the small tab on the float that presses against the lower end of the needle, to give it a bit more slack and allow the needle to open up a bit more. do this check on both carbs.
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If you have the fuel petcock (valve assembly attached to bottom of fuel tank) to either 'on' or 'reserve' and no gas is flowing through the fuel line - the most likely culprit is either a) petcock itself is clogged or the filter inside the tank that is attached to petcock is clogged or b.) you could possibly have a malfunctioning fuel cap. The fuel caps are usually vented to allow excess pressure to vent off. If for any reason that fails - then basically it becomes a vacuum issue. You could try loosening the fuel cap - not completely removing - just loosen and see if the flow starts - if so, it's your cap. (Some you could shake to test function - you would hear a rattle if the mechanism was still good - not all though). If loosening cap doesn't help and you're sure you're in correct position - you'll have to remove that assembly. Two screws or bolts usually hold petcock to fuel tank. Remove those two bolts, usually a rubber o-ring type gasket or another type of gasket - and a tube/filter is attached to petcock. As you remove you'll see exactly what I'm talking about- that's actually your fuel filter/reason there is usually not an external fuel filter. IF it's not clogged - the issue lies within the petcock itself. Some are able to be disassembled, cleaned and reassembled - if not/replacing would be only option. These tips are assuming that you've removed fuel line from carb - if not, please check with fuel line removed - if you're still hooked to carb, but are sure there is no fuel flow - and fuel does flow when unhooked/clogged port to carb or your float is not functioning properly allowing fuel to enter carb. All The Best & Good Luck
well yes it does sound like that so lets find out. The fuel needs to move through a fuel basic things to get used. 1st it must pass through the tank screen and the fuel petcock (that probally has a vacuume sw) to get to the carb,so lets confirm that first. when YOU loosten the carb,float bowl screw does fuel leak out. if YES check the carb.jets for blockage if NO check the fuel petcock for clogs or the vacuum hose attacked to the petcock and be sure its in good condition and connecten to a good vacuum source
1. remove the full line from the carb, turn on the petcock and watch it flow into a container. Make sure that the petcock is in the correct position and that the tank has at least a half tank of gas. If the petcock does not flow gas, the tank/petcock has a fuel flow issue. If the petcock has a smaller rubber line connected (vacuum controlled) to it, it will need vacuum applied to it before it will flow fuel. Vacuum can be applied using a hand held vacuum tool (purchased at a auto store) or light suction from the mouth will do.
2. If the petcock does flow fuel, remove the inlet to the back of the carb and spray a 1-2 second burst of starter fluid into the carb and attempt to start it. If it attempts to start after spraying it with starter fluid, the carb is plugged and needs to be cleaned.
Hello and welcome to Fixya! Well first lets start at the tank, remove your fuel hose and make sure your getting fuel out of tank. Next check your line from the petcock to carb. If here is no fuel coming out from this point inspect your petcock for any obstruction, try blowing air threw it. Its either something plugged inside tank, or your petcock. Now if you are getting fuel out of petock to carb, remove carb and inspect where the fuel line hooks up, remove float and float needle and then blow air threw it. If its clear then check your float height and make sure its adjusted to spec. If you need further assistance please feel free to let me know. Thanks and good luck! Cycleworx157
Your bike is equipped with a vacuum operated petcock. To check the petcock out, you must remove it from the tank. I usually use a large funnel and an empty fuel can. Loosen the petcock enough to allow the fuel to run out and use the funnel to collect the fuel in the empty can. Once the tank is empty, disconnect the fuel hose to the carb and the vacuum hose. Remove the petcock from the tank.
On the backside of the petcock, there are four small screws. Remove the screws and the diaphragm and needle in the petcock will come out. Hold the diaphragm up to the light and gently stretch it while looking for holes. If you find a hole, replace the diaphragm.
Personally, I've seen enough problems generated by these petcocks to warranty replacement with a high quality manually operated petcock. I like the Pingle petcocks. They're pricey but they WORK. I've seen too many people stranded with a whole tank of fuel and none in the carb because of these petcocks.
Sounds like a fuel flow restriction to me. I'd drain the tank and remove the petcock. Check the screen for blockages and test the flow through the petcock in all positions with low pressure compressed air. I'd also replace all fuel hoses and filters on a bike with this many years on it.
Now, your problem could be in the carb as well. But, unless you've got experience or a high mechanical ability, I'd suggest letting a shop clean the carb on the inside.
It may indeed be out of gas. You can have a full tank of fuel and be "out of gas" in the carb. The culprit could be the vacuum operated petcock. The petcock has a diaphragm in it that is opened by engine vacuum. If that diaphragm is not functioning as it should, no gasoline gets to the carb.
To test the petcock, reach around behind it and feel for a small vacuum hose. Unplug this hose and replace it with a hose you can **** on. Using your mouth, **** on the hose with the fuel line disconnected. You should see fuel flow out of the petcock. If not, you must drain the tank by loosening the petcock and allowing the fuel to run out of the loose petcock. Use a large funnel and an empty fuel container to catch the fuel. Once the fuel tank is empty, remove the petcock. Take the plate on the back of the petcock off by removing the four small screws. You'll find a diaphragm, a small spring, and a needle. Hold the diaphragm up to the light and stretch it gently. If you find a hole in the diaphragm, replace it. Check the petcock for obstructions by blowing through it. Reassemble the petcock and test it again.
Check the hose that supplies the vacuum to the petcock. It comes from the backside of the carb and runs upwards to the VOES switch and then reduces in size and goes to the petcock. Make sure it's connected and has no holes or cracks in it.
If everything looks alright, replace the petcock, connect the hose and try to start your bike again.
These petcocks are notorious for giving problems. I always recommend that the vacuum operated petcock be replaced with a high quality manually operated petcock such as a Pingle. They're expensive and require you to manually turn the gas off like the "old school bikers" do but they won't leave you stranded out of gas with a full tank of fuel.
dear rockyacers your carb does not have a internal filter the filter would be a in line filter installed in your fuel line. the other filter is a screen in the fuel tank and a sediment bowl located at the petcock. to service tank sreen you must remove petcock from tank simply unsrew petcock remove from tank and clean with comp air and carb cleaner. hope this helpful jim