I replaced the new pump that was noisy and I performed all the previous tests I have done.

Without the electric fuel pump, the engine dies after 15 minutes at 110 degrees at idle.

I restarted the engine with the fuel pump on and now it idles fine with no more starvation.

Thanks to everybody for your comments and suggestions.

I hope it lasts. You never replied to my question regarding having your tank boiled.

no matter the gas tank has been boiled and one vent pipe repaired (welded) three years ago, the same vent pipe has started to leak again. It is the one on the left side.

I will remove the tank again next week to fix this problem and eliminate all potential causes.