changing the in tank fuel pump on a 240 SW

One hose is attached to the top of the sender unit permanently, the connection is about 50 cm away.

I just changed both fuel pumps in my 83 wagon recently(like three weeks ago). The toughest part was removing and reinstalling the filler tube. There is a collar on the left side of the back that you reach by angling your arm between the body and the gas tank. It took a 10mm wrench. I took out the tank and was glad I did since it was very easy and five bolts. The two fuel hoses on top of the tank I seperated from the tank inside the car. If the hose was stuck I would have, in a difficult case, try to work soapy water between the hose and metal tube. Disconnect the battery of course. The electrical connection, I disconnected at the connector on the body and let it flop with the tank when I took it out. I don't think it will seperate from the tank access when changing the intank fuel pump. I cleaned up the tank access really well using WD 4o and then tapped it open( it only goes one way) with a solid brass piece of metal. It came off with surprisingly easy taps. The inserted fuel gauge and fuel pump had to be manuerved carefully which is one reason I was glad to remove the tank. Ok, if there was a vaccum I would think that removing the gas cap would solve that problem. You could also remove the hose at the main fuel pump. Mine has a screw clamp holding it on, It seems a daunting task but the only weary part was taking and reinstalling the filler hose collar. Rojo