Fuel problem

[tallgoldguy]

Okay, looking for help cause I'm stumped. When I run my model, as soon as I get to around a little less of an inch of fuel left in the tank, the engine starts to bog and eventually stalls out like it's out of gas. When the fuel is at this level, you cannot even prime it, it won't suck fuel. The clunk is completely submerged in fuel. My carb(WT-668),fuel lines,cylinder and piston (OBR), and clunk are all brand new. My model is a Nutech Thunderbolt III with a CY F~270 if that matters and the fuel tank itself has three lines, one supply,one return, and one vent. Weird, it seems like the carb is not able to pick up fuel from a certain level. I guess it doesn't matter cause I could just keep the fuel topped off but it does effect run time length and I want to figure it out.

 

[rcwildman]

either there is a hole in the fuel line above the clunk, or the pick up and return lines are reversed.

 

[tallgoldguy]

either there is a hole in the fuel line above the clunk, or the pick up and return lines are reversed.

Okay, that may be a possibility, but without making me look completely stupid, is the return line the top line near the primer or is it the lower one?

 

[rager33]

the return line is the one next to the primer bulb. also make sure the vent is not pluged.

 

[tallgoldguy]

Yeah, it seems that I did have the lines backwards! Thanks for the help!!!