An apparatuses for pumping fuel to an internal combustion engine has a feed pump, a pressure line leading from the feed pump to the internal combustion engine, a check valve, and a pressure sensor connected to the pressure line is operatively connected to the pressure line downstream of the feed pump and upstream of the check valve. An atomic operation assigns both un-encrypted clear-text requests and encrypted requests from a client to the same server at the server farm. The pillar is not covered with a dielectric layer and an LED package is arranged directly on the pillar with the LED packages bottom thermally-conductive plate in direct contact with the pillar top surface. Examples of these methods include the treatment of hyperkalemia, such as hyperkalemia caused by renal failure andor the use of hyperkalemia causing drugs.