If I go to MarineEngine.com and go to the Mark 75 Page it shows the part that you need as#22831Q3 or the Sierra equivalent #18-8069. If you Google those numbers you will find all sorts of choices from OEM on down to Chinese knock-offs.
Of course that’s assuming that all is stock on the engine side.
As far as the fuel tank end of the line…..that would depend on what fuel tank you have. Can you post a picture of it?
That should do it. I sold the motor, so I do not have it to take a photo. The tanks are the old original tanks with the large aluminum L shaped connectors. You have been very helpfull, Thanks