Re: How do you pressure / vacuum test a 5.7L Mercruiser ?
If you have a 1991 5.7L engine, you have a mechanical fuel pump, not an electric. But if you battery voltage is that low, your ignition system will be cutting out...
It might be a good time to do an audit on your boat and engine, and list all the things you know are not working/faulty, and a list of things of symptoms. Either way, it would be a good idea to stop using the boat and bring it back up to an acceptable level of maintenance and repair so it doesn't leave you stranded and endanger you/your family and friends, and the people who have to try and get out to try and save you...
I'm sorry if I sound harsh, but I have attended too many coroner's inquiries to make light of boats and engines that are not seaworthy... The simple truth is 'people die at sea', and it is incumbent on all of us who go to sea to take every possible measure to ensure not only our own safety, but that of our passengers. That not only includes where we go and when, but what condition our craft is in.... And just saying 'it floats' is not good enough....
Chris.....