re: Help starting older outboard

check the compression on all cylinders first what are they in order? Some motor are killer to crank with low compression. Next what is your fuels psi leaving the fuel pump needs to be about 6psi while cranking at a minimum. from there check from tank to carbs for any crack or leak...the smallest amount of air can cause huge problems. if carbbed check bowls and jets for debris. if EFI check for air in system and debris in cleanouts and filter seperator...lots to check for sure