There are many answers to this question as there are many various car pumps and they all work using other mechanisms. But generally, they all work to lubricate the engine and reduce friction and heat. The car pumps lubricate and cool the engine by pumping engine oil with tremendous pressure and force overall the engine’s contact points and bearings. The oil smoothens the moving gears and metal parts’ surfaces, ensuring little or no friction from the contact points. This, in turn, smoothens the movements in the engine, reducing heat and protecting it from wear and tear. The engine will also last longer due to the reduced risk of breakdowns.