The rubber part of the gas line might have cracks that allow air to leak IN , causing a low fuel delivery. In any event you are probably due to replace the rubber part of the fuel line. And a filter, too A new (rebuilt) fuel pump is certainly in order. Just for your information; Your car has an early '55 engine (the valve covers tell the tale) The fuel pump suppliers are going to ask if you want an early (multiple screws on top) fuel pump or late (single screw on top) fuel pump. Over the years I've had one and then the other on mine. Either one will work fine. Other than the fuel pump, the difference between early and late is the oil filler cap(s). Early (as yours is) has one oil filler cap on the camshaft valley cover. Late (as mine is) has two oil filler caps. One each on the valve covers. I've noticed something else unusual about you your car; is the power steering pump. The other fellows here I'm sure can tell us more, But, your pump looks more like what I've seen on '54 and '53 Buicks I'm sure Then and Now is very good Other good suppliers are CARS old Buick Parts Kanter Steele Rubber Bob's Auto Memorabilia SMS Fabrics (interiors) Waldren Exhaust