'83 240 fuel lines/in tank pump

Has anyone out there changed an in tank fuel pump in 83 240? I cannot get the fuel lines off the access hatch. One is attached with a line clamp, i unscrew the clamp and the hose slides straight off. The other has no clamp (the return fuel line), but will not pull off. Pulling on the hose reveals a black rippled surface, looks plastic. The rubber will move about 2-3 cm before becoming very rigid, once the pressure is released it returns to its original position. I've tried sliding a coathanger into the line to attempt to break any vacuum inside the hose, but this acheived nothing. Am i simply pulling the insulation off the hose? The end of the hose inside the engine bay is attached with brass bolts, but there is nothing of the sort at the tank end. Maybe it is a solid fuel line? Please help, without the pump replaced the car is useless in hot weather, and all the local volvo mechanics are on holidays. I'm worried if i dont get it replaced while the weather is cool i wont be able to drive it to any of these mechanics