Air bubble trouble

[adb140275]

i did the ofna 250cc midtank... not sure if it's my tank or the way i routed the fuel line, but there's a crapton of bubbles in the fuel line, making it impossible for me to get a tune...

is it the tank, the routing? any help appreciated

 

[frddyj]

make sure the seal on your tank is making a good contact & seal. :dunno:

 

[adb140275]

it doesnt seem to be making a good seal, but it appears to be the correct o ring? i dunno, this is starting to tick me off

 

[Mickey]

ebee you could be boiling the fuel with it that tight to the head and exhaust. turn the fuel inlet on the carb around and shorten that line

 

[adb140275]

sounds like a good idea... ill try that. i need some 1/8 buggy fuel line clamps so i can double loop it and tie it to the roll bar anyways

 

[adb140275]

EDIT: especially since it doesnt bubble when it's cold

 

[Mickey]

ebee you are supposed to be an engine guru. you should know that colder fuel makes more power. in any type of engine lol

 

[double a]

WOW this is a good 1 , maybe remove the line from the carb and plug it then apply pressure on the line from the pipe and look for leaks with some soapy water for a exterior check . for a interior check you could remove the tank an apply pressure to the pickup fitting to see if it makes bubbles on the inside .What size fuel line are you using ?

 

[adb140275]

i never had probs. before though. also, the fuel seems to be bubbling out of the carb and back into the tank when the engine is hot. I'm using dubro medium nitro line, double a

 

[double a]

have you changed the crank timing

 

[adb140275]

Nope, it's stock. that wont last though.

 

[adb140275]

fixed... i had the line pinched with a zip tie, didnt see that...

 

[Os.savageboy]

Glad you got it fixed! I would reroute the fueline directly to the inlet like mickey said! but i c you keeping more fuel for longer runtime this way!

 

[adb140275]

i have it looped once and tied to the roll bar, and then it goes direct to the carb

 

[adb140275]

heres a pic where you can kinda see it, i took this for my 2 stage filter mod