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Hey guys, I can't seem to get fuel to go down my gas tank without me having to blow air into it. If I leave it the "on" or "res" nothing goes down so I tried blowing in the tank and voila' gas flows, is there a reason for this besides it being clogged dirty etc.? The tank did flow fuel fine before. Also I recently reinstalled the carbs after cleaning them and am having trouble with the idle and the rpms, I have tried adjusting the throttle nut and that seems to affect the rpms but I cannot get it to stay steady and when it does when I give it gas the rpms go up or stagger a little then go down very slowly as if it stays in the rpms too long going down. Does anyone have any suggestions? Does the black spring screw type thing on the bottom of the carbs have anything to do with it? I tried playing with it but did not notice a change.
 

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Have you checked for air leaks around your carbs? That would cause the unsteady idle. Use carb cleaner or wd40.



If you bypass the vacuum function on your petcock and still have trouble clean the screen in the tank that is on your petcock straw.
 

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Your carbs might still be dirty.....



Bad spark plug boots can cause erratic idle as well and make you think it's something else....so pull the plugs boots and look at them carefully for cracks even under the little rubber grommet at the very bottom of the boot (if yours has that).



As far as the fuel flowing...is it a vacuum petcock with one big fuel hose and two smaller air hoses hooked to it ? If so then it's possible you don't have the two little hoses hooked back up onto the correct nipples. The fact that you say when you blow into the tank the fuel flows fine makes me think of this.



OR the vent hole in your gas cap is clogged.



Just some ideas
 

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The black spring screw thing is the idle adjustment, what have you been using to adjust the idle? Also how many turns out are your fuel mixture screws? Should be between 2 and 2 1/2 turns out



Do you have Larry's carb book? If not, I suggest buying it... It's worth the money for sure
 
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