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Also, the dimensions of the separating chamber are relatively large. For these reasons this solution is only adopted for small pumps, e.g. garden pumps. More frequently used types of self-priming pumps are side-channel and water-ring pumps. Another type of self-priming pump is a centrifugal pump with two casing chambers and an open impeller.
Positive–displacement pumps, however, tend to have sufficiently tight sealing between the moving parts and the casing or housing of the pump that they can be described as self-priming. Such pumps can also serve as priming pumps, so-called when they are used to fulfill that need for other pumps in lieu of action taken by a human operator.
Installed directly onto the air inlet of the starter, the in-line lubricators are self priming pneumatic pumps that require a 1/4″ lubrication line piped from as far away as 4 feet. Air Starter lubricators perform best using misting type, non-detergent oils such as diesel fuel or Marvel Mystery oil.
Another problem is the reluctance of the fuel to vaporise and combust at low temperatures. Oil dilution systems were developed (mixing fuel with the engine oil), [8] and engine pre-heaters were used (including lighting fires under the engine). The Ki-Gass priming pump system was used to assist starting of British engines. [9]
The Ki-Gass system, also referred to as Kigass or K-Gas, is "a system of starting petrol and Diesel engines by injecting finely divided fuel in the form of a mist into the in-take pipe." [ 1 ] The system uses a hand-pump to spray fuel into the air in-take, thus priming the engine for easier starting.
Since the electric pump does not require mechanical power from the engine, it is feasible to locate the pump anywhere between the engine and the fuel tank. The reasons that the fuel pump is typically located in the fuel tank are: By submerging the pump in fuel at the bottom of the tank, the pump is cooled by the surrounding fuel
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