89 Delta 88 wont start sugar in tank New fuel pump wires plugs fuel filter battery Ran after repair but now loud like rod knock valves lifters Now car won't start STP gas treatment added to new gas?

One of the problems with sugar in the tank is that it can cause so much damage. Water condensate will disolve some of the sugar and it can make it through the fuel system, all the way to the engine. It can plug the fuel pump, fuel filter, injectors and any if any disolved sugar makes it to the engine it can cause deposits on the valves, cylinders, pistons and rings. Sugar in the tank is a very destructive dirty trick and effectively makes the vehicle useless. Many people use locking gas caps, more to protect against sugar in the tank.