Originally Posted by Griff

I've never run a Hardin Pump. Mine are the Gen VI sea pumps with no fuel pump. I did have one of mine rebuilt--twice. Blew out the inner seal both times. After the second rebuilt failure in less than a year, I bought a new OEM Merc one from Michigan Motorz. That was 5+ years ago and no issues since.

Originally Posted by xlint89

I do not have any personal experience with the Hardin sea pumps. I did do a lot of reading up on them when I found one for sale at a good price.

It seems some people have differing opinions. Might want to hang onto the OEM pumps just to be safe.

It's prob safe to assume most people have had good results with them.

One of the problems I had read about was the oil reservoir for the fuel pump lubrication builds up pressure and pushed oil past the front seal. Hardin does sell a kit that is supposed to bleed off excess pressure. https://www.hardin-marine.com/p-1044...equalizer.aspx

Another issue I had read about had to do with low or lower water pressure than the OEM pump. Someone was saying there were slight differences in the impeller cavity size that reduced output?
You can do a search on here by typing in Hardin sea pump in the "search" bar and you should see threads about them.

Originally Posted by 87CigCafe

Will I hurt this pump if I put a two 90° fittings on the back of this instead of these inlet and outlets being vertical because my oil cooler is on the port side of the engine instead of the back and top of the bell housing of the engine….

Originally Posted by Ryanw10

I would bet that you would hurt flow. How much though im not sure. When I used to work automation I swapped out a bunch of 90 degree pneumatic fittings for straight ones and we gained significant cycle time on our machines just by doing that.

Originally Posted by Helmwurst

I have never had a water pressure problem with the Hardin pumps. In fact, I have the opposite. I tend to have excessive pressure, except at idle.

Originally Posted by Griff

I've never run a Hardin Pump. Mine are the Gen VI sea pumps with no fuel pump. I did have one of mine rebuilt--twice. Blew out the inner seal both times. After the second rebuilt failure in less than a year, I bought a new OEM Merc one from Michigan Motorz. That was 5+ years ago and no issues since.

Originally Posted by 87CigCafe

Disregard needing two 90’s just need one.

Originally Posted by Helmwurst

How were your old pumps plumbed in? You had the stock Merc's right, they are straight???