Ok I have a 1986 Alpha 1 outdrive and I may need a new trim pump, I think the valve block on the bottom is cracked and leaking. In 1986 Alpha's what type of Prestolite pump did a Alpha use, High pressure low volume or low pressure high volume. How do I tell the difference is it is only discernible through the part number?

Ayuh,.... Just buy one of the new plastic tank replacements, 'n plumb it in,.....

It'll work perfectly, regardless which one ya got now,.....