Sounds like a blocked fuel filter. Causing the pump to work harder - hence the funny noise from it.

Change the fuel filter and check pump supply. Not sure of exact figures but you should get so many ml per min. If after changing the filter you don't get the required volume - change the pump.

BTW, do not work in the pits when working on the fuel line under the car. Fumes get trapped in pits. This can be dangerous.

Adam