Learn French: Cette saleté ne fait qu'engloutir l'argent de tous les clients. - This piece of junk does nothing but gobble up all the customers' money.

Ne faire que followed by an infinitive is a structure that means "to do nothing but [verb]". If you just used the standard restriction and said Cette saleté n'engloutit que l'argent, it would mean "This piece of junk gobbles up only the money" (as opposed to gobbling up their credit cards, too). By adding fait, you emphasize that gobbling up money is the only action the machine performs.

I thought saleté meant "dirt". Why is it translated as "piece of junk"?

While saleté literally refers to dirt or filth (from the adjective sale, meaning "dirty"), in colloquial French it is frequently used as an insult for a broken, useless, or frustrating object. It functions exactly like saying "piece of junk" or "piece of crap" in English.

What is the literal meaning of engloutir?

It literally means "to swallow up" or "to engulf" (like a predator swallowing its prey whole, or the sea engulfing a ship). Using it in this context paints a vivid, dramatic picture of the machine greedily eating everyone's cash.

Do I pronounce the "s" at the end of tous in tous les clients?

No, the "s" is silent here. When tous acts as a determiner placed before a noun phrase (tous les clients), the "s" is not pronounced. You only pronounce the "s" when tous acts as a standalone pronoun (for example: Ils sont tous là).