How to Troubleshoot & Replace Bosch AP2802387 / 00263099 Sump To Water Inlet Hose

(It's the middle of the three tubes you can see on the side) Tube is held into both ends by friction of o-ring. End that is nearest also has a plastic clip to keep it on. Removed that plastic clip, then both ends are held in by friction. Removed tube by carefully pulling on nearest end until tube is loose. About the same for the other end... there is a small friction fork-like clip that it can be freed from before pulling out the tube in much the same manner as the other end. Replacement is opposite of removal - a little grease on o-rings didn't seem to hurt either. (non-petroleum based, they're likely rubber) No tools needed, but the tools listed were for removing dishwasher from under cabinet. 

Bacteria buildup in the venting assembly and drain hose. Replaced them and it's back to normal 

Dishwasher would not run. When I turned the unit on the sump/drain pump would run continuously. Disassembled the dishwasher side panel and noticed water had filled the lower tray. I turned off the water to the unit and emptied all the water from the tray using a sponge and paper towels. Then I turned the supply water back on and looked for the leak. The leak was coming from the sump drain hose at the point where the hose sits on a support post near the outlet of the sump/drain pump. I pulled out the hose and saw that there was a hole in it. Bought a new hose from Appliance Pros. Reinstalled the new hose and it was fixed. 

Replaced 20 year old hoses, age-embrittled with pinhole leaks. Leaks only visible from the side under pressure, so had to jury rig dishwasher in garage to diagnose 

I bought the drain hose, the sump to the water inlet hose, and the sump to the float hose. All three fit perfectly. My only serious problem was connecting the drain hose to the air gap. Since the air gap unit was placed in the cabinet before the dishwasher was originally installed, it was difficult to access because of the water and drain lines now in place. 

I found the model number and went to the blue prints on the site and found the parts needed. I ordered the parts and was surprised they arrived the next day which was quicker than expected. Allowed me to get the repair done quickly. 

I tracked down each part either in my local hardware store or online and I replaced each hose; from supply to drain and everything in between 

Replaced circulation pump and hose seals. 

REPLACED HOSE 

I watched the repair videos and read the reviews for both repairs prior to placing my parts order. Other reviewers had suggested ordering two hoses that could possibly break during the repair, so I did that as they were pretty cheap. I had the repair video for the circulation pump up during the repair and completed the valve replacement during that session. The valve replacement was a piece of cake. I followed the circulation pump repair video exactly, and it went really well. I have a Thermador dishwasher instead of a Bosch, but the only difference was some extra insulation and side panels. The dishwasher acted like new after starting it back up. This is a great site for DIYers.