When I go out the engine runs fine for the whole tank. When I come in to refuel the engine will stall and I see bubbles in the fuel line. I have the fuel line going around the back of the engine as I have all last year and never had any problems. This year it is a spec. engine and I put new fuel line on it. I was wondering if I need to run the fuel line in front of the engine. Any thoughts? Thanks

Tanks vibrating? The only real cause or too short of line between the pipe and tank. This can cause that as well. Try lengthing that if it isnt already long enough.

What car is it.

It's a MTX-3.

I'd look to see if you have any bubbles at all, when the tank is full. Look at the fuel line from the carb. If you have any bubbles, pull the motor and get some high temp silicone and seal the back plate, the carb base, and your pinch bolt. I do this to all my engines as a pre-caution anyway. My pressure line in my MTX3 is about 4 inch's long, and my fuel line is around 3 inch's. I've ran the Mugen x12 engine, OS-TR, and now the Sirio modified by Mernan.

Hope that helps.

Thanks Jea3 I will try it.