So I drained the oil and it looked good. Blew out the oil line, replaced the in line filter, and soaked the 90 degree brass valve with quikleen and gas by the remote tank. Hooked everything back up and ran it for 10 minutes and it stayed at the same level maybe filled a little bit. When it was running I checked for leaks with soapy water and nothing bubbled. Should I replace the brass coupler in the picture? Does this have a check valve in it? Also the air side that c20250425_165534.jpgonnects to the block has a brass fitting directly to the block. Should I replace that too?