How a pump sounds when it breaks down

Hi eveyone, today I will talk about an issue with a pump of a burner of a boiler.

When pump sucks up fuel oil and this one is not clean, the pump goes under stress and this can cause damages to it, in fact the pump will be replaced. 

So:

1. Use a good filter before the pump.
2. Cleaning of what it sucks up is so important to not damage the system.
3.  If you see oil leaks from the pump, it is damaged.