Hope your tank is low!! Yes you have to drop the tank on the '88, I've had to do it a couple times to replace the fuel pump in my '88 Pony. Once you get the tank out there's a locking ring you have to remove then you can just lift the pump/float assembly straight out of the tank. The new fuel pump should come with a new O-ring to use when you put the locking ring back on. Be sure you use the new O-ring.