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Earlier carburated vehicles used external fuel pumps.
Nissan 280z's and zx's had external fuel pumps around that psi, and Ford's from the 1980's had external fuel pumps (but it had a higher psi).
Steam has the capacity to flow through the system without support of external energy sources like pumps. However, it lacks modulating quality
Depends on the size of the system and what exactly you are going to replace. In many areas now, you must have an 'engineered' system of tanks,pumps and a field. This can cost 20-25,000 dollars to build. For a better answer you must be more specific as to what exactly you wish to replace.
The cardiovascular system pumps blood throughout the body.The Nervous System of course.
The circulatory system
Heat pumps use compression pumps and condensers to cool air.
Well the excretory system is port of the digestive system.The excretory system pumps blood around the body and the digestive system pumps food down the body.
A gear pump uses the meshing of gears to pump fluid by displacement.[1] They are one of the most common types of pumps for hydraulic fluid power applications. Gear pumps are also widely used in chemical installations to pump fluid with a certain viscosity. There are two main variations; external gear pumps which use two external spur gears, and internal gear pumps which use an external and an internal spur gear. Gear pumps are positive displacement (or fixed displacement), meaning they pump a constant amount of fluid for each revolution. Some gear pumps are designed to function as either amotor or a pump.
The heart is a muscle, but it is NOT in the muscular system, and pumps blood to all parts of the body :)
the circulatory system. it is a blood organ that pumps blood.
Erdem Koc has written: 'End plate lubrication in external gear pumps'