run every x time

#define pump 6
#define solenoid1 1
#define solenoid2 2


unsigned long previousMillis, currentMillis;
unsigned long current_pump_time;
unsigned long operation_pump_start;
const unsigned long interval = 30000; // interval time
const unsigned long TIMEOUT = 3000; // interval 3sec

void setup() {
    pinMode(pump,OUTPUT);
    pinMode(solenoid1,OUTPUT);
    pinMode(solenoid2,OUTPUT);
}

void loop() {
  currentMillis = millis(); // update with every loop
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis; // new startpoint
    pump_running = true;
    operation_motor_start = millis();
    digitalWrite(pump,HIGH);
    delay(500);
    digitalWrite(solenoid1,HIGH);
    digitalWrite(solenoid2,HIGH);
  }
  // Stop pump after timeout
  if(pump_running == true)
   {
      current_motor_time = millis();
      if(current_pump_time - operation_pump_start > TIMEOUT)
        {
             pump_running = false;
             operation_pump_start = 0;
             digitalWrite(pump,);
             digitalWrite(solenoid1,LOW);
             digitalWrite(solenoid2,LOW);
          }
     }
}