Fuel Display GUI Procedure not working

I've done a lot of looking for answers and so far everything I've seen shows this procedure should work. I have 10 different procedures attached to 10 different images in a GUI. The image is meant to be displayed when the procedure returns true. The first one showing 0 fuel does work. The rest however do not. They all follow this pattern. Is there anything you all see that might be part of the problem?

import net.minecraft.world.level.block.entity.BlockEntity;

import net.minecraft.world.level.LevelAccessor;

import net.minecraft.core.BlockPos;



public class KCFD9Procedure {

    public static boolean execute(LevelAccessor world, double x, double y, double z) {

        double max = 0;

        max = getBlockNBTNumber(world, BlockPos.containing(x, y, z), "MaxFuel") / 10;

        if (getBlockNBTNumber(world, BlockPos.containing(x, y, z), "fuel") > max * 8 && getBlockNBTNumber(world, BlockPos.containing(x, y, z), "fuel") <= max * 9) {

            return true;

        } else {

            return false;

        }


    }



    private static double getBlockNBTNumber(LevelAccessor world, BlockPos pos, String tag) {

        BlockEntity blockEntity = world.getBlockEntity(pos);

        if (blockEntity != null)

            return blockEntity.getPersistentData().getDouble(tag);

        return -1;

    }