In tank fuel pump.
 

It the in tank fuel pump easy to replace?

Not sure what model you have but in my 83 volvo 244GL you can access it from the trunk. pull back the trunk liner...more so the area under the window ( the Hump)...there is an access panel there 2 phillip head screws, remove it to allow access to the fuel tank and pump.....i have not done it myself but all of the fuel line go into that access....i think that you will need a special tool to rotate the assembly..good luck