Air bubbles in Fuel line

[MrOrange]

I got a force .25 engine from Balistic and have installed it into my Kyosho inferno MP-6 Buggy.

The engine has heaps of comp and starts and idles fine. The problem im having is at WOT the engine splutters about wanting to stall. On closer inspection there's tiny air bubbles in the fuel line from tank to carb which i believe is causing the spluttering (sounds like a miss) I figure because of the positive pressure on the tank from the exhaust the bubbles could only be coming from the tank end but i dont see how. I have replaced the fuel line, tried a different tank, filled the tank right to the top and none seem to make any difference..

I dont see how the air could be getting in from the carb end because you can see the bubbles moving towards the carb.. but i dunno..

Does anyone have any ideas??

Cheers,

James

[MrOrange]

Oh i forgot to add, when i first start it and give it some, it runs fine without spluttering for around 10 secs.. then if i let it idle for a while say 30 secs then take off can do WOT for a further 10 secs without a problem...

[azzachaz]

Check the connection at the fuel tank to the fuel line. Air might be getting sucked in there at WOT (highest negative pressure). I had this problem but a tight zip tie fixed it up