dmpatanis Posted January 18, 2011 Share Posted January 18, 2011 Hello,i have a problem when the fuel drops in 3-liter in the tank(14-liter) of paramotor the engine idles ok but if i push the throtle the engine shut down.Why???? If i put 2liter more(5liter totaly) all its Ok,Why???? What i must check??? The fuel tank is this: Quote Link to comment Share on other sites More sharing options...
pete_b Posted January 18, 2011 Share Posted January 18, 2011 Make sure that the pipe in the tank is on the bottom of the tank. If it is in the bottom you may have leak in the pipe where 3 litres of fuel come, if it goes below this level then it will suck air in to the pipe. Put more fuel in and it will be above the pipe so it will not suck air in. Quote Link to comment Share on other sites More sharing options...
aquatix Posted January 18, 2011 Share Posted January 18, 2011 Is there a weight on the bottom of the fuel tube in the tank ? Quote Link to comment Share on other sites More sharing options...
spigot Posted January 18, 2011 Share Posted January 18, 2011 I was going to write an essay on this, but I wont First check the "Donk" is lying at the bottom of the tank covered in fuel. There are no kinks or restrictive cable ties on the fuel line and the filter is clean. Then check the breather pipe for the tank is clear. A dead giveaway for a blocked breather is opening the filler cap straight After the motor has stalled and hearing the rush of air entering the tank. (a vacuum has formed, starving the carb of fuel). By adding fuel you will have already released the vacuum and the motor runs fine for a while. If all is OK. I would suggest the problem lies within the carburetor. A weak/damaged diaphragm will rely on gravity feeding fuel up to the carb (IE more fuel in the tank). probably Colin B Quote Link to comment Share on other sites More sharing options...
dmpatanis Posted January 19, 2011 Author Share Posted January 19, 2011 Hello,i open the cap of the tank and i see that the end of the fuel line was in the fueland covered of fuel,only this.The engine when the fuel in the tank drops under the 3,5liter seems not working good. For example with 3liter and the fuel line in the gas tank the engine idles ok,but when i push the throtle seems to shut down.If i put for example 2 liter more all was fine.Why does this happend. The fuel line covered of fuel,the breath of the tank its Ok,the engine is new,what other to check?? Thanks a lot. Quote Link to comment Share on other sites More sharing options...
pete_b Posted January 19, 2011 Share Posted January 19, 2011 You may have leak in the pipe where 3 litres of fuel come, if it goes below this level then it will suck air in to the pipe. Replace the pipe Quote Link to comment Share on other sites More sharing options...
dmpatanis Posted January 19, 2011 Author Share Posted January 19, 2011 When i have 3liter in the tank i see that in the fuel pipe appear a bubbles. When i fill the gas tank with 5 liter the bubbles disapear. How i can change the pipe inside the tank??? Thanks a lot. Quote Link to comment Share on other sites More sharing options...
pete_b Posted January 19, 2011 Share Posted January 19, 2011 It depends how it is fitted, if you dont know then get some one else to do it for you. I garden machinery centre should be able to do it. Quote Link to comment Share on other sites More sharing options...
nigel_d. Posted January 19, 2011 Share Posted January 19, 2011 Now listen to me... I used to have a rad that did the same thing, I believed it was because there is a limit as to how high fuel can be sucked for proper fuel flow. I may be wrong in this case but there is certainly a height that a vacuum would form in the closed end of tube filled with petrol or any other liquid. Nige Quote Link to comment Share on other sites More sharing options...
pete_b Posted January 19, 2011 Share Posted January 19, 2011 Now listen to me... I used to have a rad that did the same thing, I believed it was because there is a limit as to how high fuel can be sucked for proper fuel flow. I may be wrong in this case but there is certainly a height that a vacuum would form in the closed end of tube filled with petrol or any other liquid.Nige Yes!!!!!!! you are wrong There is a limit but it is a lot more than the distance from the tank to the carb, And that would not cause it to start sucking air bubbles in to the pipe. Quote Link to comment Share on other sites More sharing options...
nigel_d. Posted January 19, 2011 Share Posted January 19, 2011 Didnt see the bubbles bit, must pay more attention. Nige Quote Link to comment Share on other sites More sharing options...
pete_b Posted January 19, 2011 Share Posted January 19, 2011 Didnt see the bubbles bit, must pay more attention.Nige Quote Link to comment Share on other sites More sharing options...
dmpatanis Posted January 19, 2011 Author Share Posted January 19, 2011 (edited) Now just return from the garage. I check the pipes and its ok then i fill the tank with 6liter of fuel and at the start(cold engine) the motor its ok(idle and the full throtle)but when the engine is hot idles but when i push the throtle dies??? Why??? Sky 100 with WG8 carburetor Please help me. Thanks a lot. Edited January 19, 2011 by Guest Quote Link to comment Share on other sites More sharing options...
garyfreefly Posted January 19, 2011 Share Posted January 19, 2011 from memory the maximum you can suck any liquid is around 33ft no matter how good a sucker you are or have got.. something to do science and stuff thats just the way it is and from what Ive seen no paramotor has the fuel tank 33 ft below the engine Quote Link to comment Share on other sites More sharing options...
nigel_d. Posted January 19, 2011 Share Posted January 19, 2011 ...but it does get harder to suck the higher it has to go, still I agree that the 2 foot or so from the bottom of the tank to the carb is a long way short of 33 ft. I wonder how high a typical motor could pull fuel before it started struggling. Nige Quote Link to comment Share on other sites More sharing options...
pete_b Posted January 19, 2011 Share Posted January 19, 2011 Now just return from the garage.I check the pipes and its ok then i fill the tank with 6liter of fuel and at the start(cold engine) the motor its ok(idle and the full throtle)but when the engine is hot idles but when i push the throtle dies??? Why??? Sky 100 with WG8 carburetor Please help me. Thanks a lot. Try turning out ( anti clockwise) the lo jet screw 1/4 of a turn to richen the mixture it my runn a little rougher on tick over but should get rid of the flat spot. Quote Link to comment Share on other sites More sharing options...
dmpatanis Posted January 21, 2011 Author Share Posted January 21, 2011 Finally the problem solved. The primer pump removed with a new one and now the engine is like new. I set up the WG-8 carburator:i unscrew 1 and 3/4 of a turn each screw(high and low). Thanks a lot. Quote Link to comment Share on other sites More sharing options...
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