The Auxillary pump is a simple job to replace. The pump is mounted in a rubber holder and will slide out of the holder. No need to remove the metal bracket holding the rubber holder. Before inserting the new pump into the rubber holder spray the inside of the rubber holder with a little WD40 or a little soapy water. This will make the new pump slide into the rubber holder easier. The rest of the job is to plug in the wires and remove replace the 2 hoses.