Re: 89 OMC 5.8L fuel pump
The pump is no longer available. I had to buy a Volvo pump. That pump must be disassembled and the inlet / outlet tubes "rotated" to match the original part. I ordered it over the phone and don't have the part number yet. When I get the # I'll post it here for the benefit of those using the search feature.
Probably too late now but When I needed a pump for my Mercruiser 454, I looked everywhere (because I didn't want to pay close to $200) for an "Aftermarket" pump.
I discovered that ALL OEM Mercruiser pumps and maybe ALL OEM pumps are manufactured by Airtex. Both Autozone and Schucks/Kragen (now Oreilllys I think) and maybe most major autoparts stores have an AIRTEX or Master catalog.
Those catalogs show just about every pump model made and they have a "Marine" section.
I was skeptical so I called Airtex and spoke to one of their reps and while they do not sell retail he told me that Airtex IS the OEM for just about all mechanical pumps that are not imported. (neither Mercruiser nor Volvo makes their own fuel pumps)
I ended up buying the right marine pump for my 454 for about $50 (it was exactly the same pump that Mercruiser sells and other "marine" dealers sell)
FWIW.....
Rick