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unusual fuel issue

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J

jeff5150

RC Newbie
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Location
sevierville, tn
RC Driving Style
  1. Bashing
  2. Racing
just picked up an used team losi xxx-nt with the factory mach .15. brought it home and after i cleaned it up some and added a roto start from a hpi savage 4.6(i hate pull start, lol) fired it up and tuned it out. ran great, good smoke, good temps, plenty of power. ran a couple tanks through it to make sure all was well, then i put it up for the night. next morning a bunch of us go out to a local bash area and i pull the truck out, fires right up. idles good then all the sudden stalls. tried to fire it back up and no go. starts to spew raw fuel from the exhaust and wont fire. the carb settings were not touched from the time i set it the night before when it was running perfect. so i changed glow plug, nothing. run the hsn and lsn all the way in and set to factory setting. nothing, still raw fuel. leaned the lsn to the point it was almost closed, still raw fuel. brought it back to 4 turns out as per factory. pulled the fuel line to the muffler and it was where the fuel was coming from. the fuel going to the carb inlet wasn't moving, but it was pouring from the fuel line to the muffler. the fuel lines are not backwards. i thought it might have been the mip stinger exhaust for some reason, so i put the stock set up back. no change. talked to the lhs and they want me to replace the motor, of course.... thats a thought but i want to figure this out first, before i go that route. any help is greatly appreciated because I've tried about everything i can think of. pulled the needles out of the carb and cleaned the passages with carb cleaner and rest them. i havent tried it since then because it was late, so I'm hoping it helped.
sorry for the long post, but i wanted to get as much info in the post as i could. thanks in advance. :worship:
 
It's likely the new plug got soaked on the first pull.
Remove it, spin the engine upside down to blow out any excess fuel and wait 10 minutes before putting the plug back in.
 
ill give it a try, but i can't figure out why the fuel would be going through the fuel line to the pipe and not the fuel line to the carb. if i put my finger over the pipe to prime the fuel system, it squirts out like a garden hose from the pipe.
 
That just doesn't work that way. From the bottom of the tank the line needs to go to the carb. The other line goes from the fitting on the muffler to the top of the tank, often in the lid.
If it already ran, then the only possibility is that it's flooded and you continued flooding it.
 
thats not what it is. it is not flooding the cylinder. the glow plug is dry. when i start to turn it over the fuel squirts out of the muffler and then i pull the line out of the muffler and the fuel is pouring out of the line. no fuel is going through the carb, or not enough to flood it.
 
full, 3/4, 1/2, near empty... i have been in this for 10 plus years and have never seen this before.
 
Have you taken the lines off and tried blowing through the line that goes from exhaust to tank and see if fuel comes out the other line? Almost sounds like the line going from tank to carb is blocked and back feeding to the exhaust.. the pressure has to go someware
 

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