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Not Pulling Fuel

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S

StrykingRevo

RC Newbie
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Location
Elmira Heights, NY
RC Driving Style
  1. Bashing
So I'm frustrated. i just put a picco .26 with eaze start in my revo. went to go start. wouldnt turn over. didnt have a glo plug driver/starter.. went and bought one with a few new plugs. plug is good. motor wouldnt pop or turn over. i unhooked fuel lines and blew through the tank and gas came out. running blue thunder although heard some bad about that fuel. it seems like the carb isnt pulling fuel from tank. i have the carb at factory settings. it wont prime with finger over exhaust. I'm sure everything is hooked up correctly. why wont it pull the fuel? i dont use that garbage blue wire anymore just the plug ignitor. the motor turns the piston. i put some raw fuel in carb and it turned over but died cause it ran out of fuel. everything seems to be working fine. i could have an air leak which would make it not pull the fuel. I'm going to get some high heat rtv tom. and seal things up. Any ideas? I'm truely confused. please help
 
Check to see if the seals are good on tank. I had the same prob. and it was th o-ring on the tank went bad.
 
make sure that you have the fuel lines on the right way and prime the engine by blowing on the back pressure line untill fuel reaches the carb and then put a few drops of fuel into the engine and start it and c what happens.

Putting a few drops into the engine should be enough for it to start for a short period of time and then the back pressure should draw more fuel into the engine :)

hope that helps
 
revo_rob_1984 said:
thats a good way to be
Click to expand...

Wish more people were like that because when some people post information and it works but dont get told that its a good idea or what so ever then they tend to stop posting because they think what they are saying is useless
 
working on it

So i failed to tell you vital info. i cut the fuel line alot shorter... more direct fuel flow to carb my thought. not sure if that was a good idea? i def. had the fuel lines hooked up correctly. i talked to someone at my local hobby shop striving for info. he said take off air filter and put a finger over that intake and over exhaust while trying to start. thus testing the carb for air leak. this doesn't let air in but pulls only fuel. i tried and eventually got the fuel to flow to carb. no air leak thankfully i think. my starter battery died shortly after. not to mention i believe i killed my one way bearing in my starter the night before because i was frustrated with the motor not even popping. so i dumped nitro drectly to carb and it turned over. so i knew the fuel wasn't getting to the carb. i think the short fuel line being pressurized had air in it. I'm thinking the air in the line was fighting the fuel to get to the carb. still not sure why it just didnt pull the air then nitro to carb.??? like i say i got fuel to the carb thankfully. so now the starter only engages for a few seconds when u hit the button. so its got to be the one way bearing right? the reason i smoked the one way bearing is because when i dumped the raw fuel into the carb directly i think it locked up the piston (too much fuel)and stressed the one way. FRUSATRATION OF LEARNING! so it wont start still. i may have air leak still.. i dont know? i am going to buy one way bearing and replace it. why would starter only engage for a few seconds? Thinking the piston has to turn over more to spark fuel.i know a few of you know my multiple questions and frustrstaions! HELP!
 
I'm still not sure if its actaully pulling the fuel. could the high speed needle be clogged? i pulled it all apart and it looked okie. why wouldnt it suck the fuel? There has to be an air leak! I'm getting some high heat rtv silicone!
 
First off the carb does not "pull" fuel. The exhaust pressure "pushes" fuel up to the carb.

Air leaks are a big problem, but you need to start at the beginning of the chain. Does your mill even have any back pressure? Does your exhaust have a leak somewhere? Is your pressure line from the exhaust intact and connected to the fuel tank?

From here check the fuel tank. Is the lid sealing tight? Is there a leak in the tank?

Next check the fuel line from the tank to the carb.

Need more? You can brush a soapy water solution over everything. Pull off the air cleaner and place your thumb over the inlet. Blow through the pressure line while looking for bubbles. Any place you find bubbles will be an air leak.
 
Okie.. first of thank-you.. u r a rc addict.. umm i think the exhause does have a leak possibly. me and my buddy thought the rubber boot between header and exhaust was leaking. i put some electrical tape around boot to help. (rookie move, input???) How would i test for air leak in exhaust? soapy brush test while starting??? i didn't realize air leaks wee such an issue but that makes sense with the high compression. everything in exhaust section is in contact from what i can see. the fuel lid may not be properly sealed. i have ruled everything else out with the fuel tank besides the seal. To test i just push down on the fuel lid while trying to start? it was sealed a few years ago when i put the rc up for storage. with the blow test everything seems to be working fine. i think the lid seal is still good. still need to test carb for air leak. More important the starter motor isnt staying engaged. one way bearing? only stays engaged for a second or two upon hitting the button. please help this amateur!
 
I would pull and check that OWB--it is either bad or dirty. As for the exhaust/carb/tank leaks just use the soapy water. Pull the pressure line off the exhaust and the air cleaner off the carb. Bush your soapy water solution around the carb base, the exhaust port and header coupling, the tank seam and lid, needles, etc. Put a finger over the crab inlet and another over the exhaust outlet. Blow through the pressure line to the fuel tank (make sure the tank is empty! :) ) and look for the bubbles.

Since your rig has been in storage for so long, I would say you definitely need to remove that OWB and give it a good cleaning. When you go to put the backing plate back on, use some RTV sealant to seal it up. Just a little will do ya!

I would also get a new o ring for the fuel tank even if it doesn't look like it's needed. Sitting that long has bound to have dried it up. You may be better off replacing all the fuel line with new since old line tends to get porous from dry rot.

If you need anything else, or this doesn't help, let us know! ;)

BTW--I doubt the electrical tape will help much. A new coupler will get it fixed, though! :)
 
Last edited:
Thanx... all those tips seem very helpful.. i will shortly pull the owb. looks like i need to go back to my local hobby shop. :) this time I'm going to need a list. i can pull stuff off today and test for air leaks as soon as i gain some ambition. Um when u said use a little rtv silicone on backplate u mean all the way around it? to seal it? I kinda figured the electrical tape wasn't helping much not mention its an eye sore. I'm sure i will be back on here soon!!!
 

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