I am replacing the oiler pump assembly on a vintage Husqvarna 41 that runs strong but will not oil the bar. Looks like the plastic pinion (part F below) that connects to the gear (part G) on the drive shaft is heavily stripped and not turning. That's easy to replace, but I am having trouble figuring out how to replace the hose (part A) that goes into the oil tank. Here's the part diagram:

Part C comes off easily but part A that goes into the tank is rather tightly stuck to the frame. I think I should replace that as well, even though it may not be clogged. Any suggestion on how to remove it without ruining it? TIA.
BTW, I have started and run the saw with the bar and cover removed and no oil reaches the slot D that part C connects to.

Part C comes off easily but part A that goes into the tank is rather tightly stuck to the frame. I think I should replace that as well, even though it may not be clogged. Any suggestion on how to remove it without ruining it? TIA.
BTW, I have started and run the saw with the bar and cover removed and no oil reaches the slot D that part C connects to.