[Blades]

Put this anywhere

pawn Код:

stock PlayerName(playerid) {
 GetPlayerName(playerid, name, 255);
 return name;
}

pawn Код:

if(strcmp(cmd, "/refilladm", true) == 0)
{
  if(dini_Get(PlayerName(playerid), "adminlevel") >= 1)
  {
    if(GetPlayerState(playerid) == PLAYER_STATE_DRIVER)
    {
      Fuel[GetPlayerVehicleID(playerid)] = 999; // Change the array name & value to the correct ones
      return SendMessage(playerid,WHITE,"[*] Vehicle refilled.");
    }
    else return SendMessage(playerid,WHITE,"[*] You're not driving a vehicle.");
  }
  else return SendMessage(playerid,WHITE,"[*] You're not an admin.");
}

Based of Finn's reply
Untested, might not work.
Also you should get the PlayerName thingy