About 5 years ago, when I was having air bubble issues I replaced most push on hoses with new ones.

Plus bypassed the fuel heater and tiny pre-filter by using the 3/8 barricade type hose and an inline large 3/8 sediment filter of 125 micron. From that filter I used 3/8 barricade to the snipped off old clear hose that fed the fuel pump.

The snipped off clear hose was a good fit for the larger 3/8 hose that fed it. Tightened all new hose ends with good quality fuel hose clamps. No problem since.

As I recall the 3/8 hose that connected to the metal fuel line from the tank was pushed over a ridge in the metal line and the clamp put just behind that metal ridge. No problem with air bubbles or leaks since.