Fuel bubbles?

Seriously consider a "vapor return system." You can use a Wix fuel filter METAL which has a 1/4" orifice built into the filter for that very purpose.

You need to run the 1/4" line back to the tank. Also make SURE your tank is actually vented

Wix 33054:



or Wix 33040, for 5/16 and 33041, for 3/8 lines