[79gmc5.3]

Hey guys I called Performance Online about my fuel tank today. I was inquiring about an intank fuel pump they said I would have to use an inline pump because the was not a sending unit/fuel pump for this tank. any suggestions on how I could use an intank or which inline to use? If you look at the first pic where the sending is it looks like a fuel line coming out of it but it's not, mine just has the red wire that hooks to the gauge. The fitting to the left is a return and the other (feed line) is below the return line at the very bottom of the tank. Thanks for your input!