Fuel pressure 100% will bend the tangs for the float on some carbs. Huge problem on the older Jeeps with the inline 6 and the Carter carbs. 6 psi is all it takes with that carb. The needle gets forced back The floats are all the way up and there's no movement left. You can put brand new float...
100%. I've witnessed exactly what you're describing with fuel pressure bending the float tabs. Huge issue with the Carter carbs in the Jeep world. 4 psi max. The fuel filter controls pressure, and nobody checks fuel pressure after they replace it. 6 PSI, and the carb won't last a month. So...