When my 74 145 k-jet gets below a 1/4 tank, just into the red, it bucks a bit until I add gas. I've heard of a refit of a fuel pickup with a pre-pump. What year is the part# and car/year? Any "fitment" issues?
T'anks evree1

Just a note of caution. If the 74 fuel tank is same or similar to the one in my 72, there will be two screw plugs on the bottom side of the tank. Remove the small screw plug and drain the fuel into a container. Then remove the larger screw plug and, if all goes well, you will be looking at a small cylindrical filter which can be gently pulled off the pickup tube. I used some teflon tape on the threads when refitting the plugs. Of course you want to do this only when there is very little fuel in the tank.

These cars don't need one. The fuel pump is very close to the tank thus not needing the prepump setup. When I had bucking problems in my 74 142E with K-jet
it drove me crazy until I talked to an old time Volvo mechanic. Seems in the
interest of clean fuel Volvo installed a sock filter on the outlet pipe for
the pump. This sock clogs up and causes bucking and fuel problems and will drive
you crazy, too. You can remove the plug in the bottom of the tank and pull
the sock out of it. The plug uses a square drive if I remember correctly. It's
usually pretty tight and it's brass so be careful when removing and installing
it. Wish you well, hope it helps.

Dave 82 242ti