[Ziggy]

Thanks, l was not aware of them. But, what was the purpose of the "air dome". To vent the air in the fuel line? To maintain constant fuel presence and remove any voids or air slugs to the fuel pump?

[Engine-Ear]

Originally Posted by Ziggy

Thanks, l was not aware of them. But, what was the purpose of the "air dome". To vent the air in the fuel line? To maintain constant fuel presence and remove any voids or air slugs to the fuel pump?

It is not a vent.

But, much like the air columns located on your basement utility tub's water controls, the small volume of trapped air acts to smooth out pressure pulses of fuel associated with the pumping action, which is probably worse at some RPM than others.