Which pump do you need? You have a 383 SB and closed cooling, but nothing about what pump is installed now, or serial number of motor

With Mechanical fuel pump option
Without the option
With drain option
Which Gen

Good Questions. I am swapping outdrives in my boat that had an OMC outdrive to B1. I have the upper and lower units, now , among other things, I need the transom assembly, gimbal etc and a sea water pump. I have a separate mechanic fuel pump I don't really want to go with the sea pump that has the fuel pump combined, unless there is an upside to that I'm missing. As far as I know the transom assembly doesn't effect which sea pump I use, if someone could confirm that I'd appreciate it. I can go with any sea pump, I'm trying to figure out the best way to go, that's why I was considering the crank mounted pump as well. I'm leaning towards the gen 4 Hardin that's all stainless, or the factory merc w\ plastic housing.
I've seen the drain plug option, how does that effect the decision? Also sen one and two piece pumps, I'm assuming that is just the cap that has the nipples mounded into it or separate where the nipples thread on, is that correct, what's better?

thanks guys, I appreciate it. I've got a lot of work to do, just trying to figure out the best way to spend the money, I wold defiantly like to spend it with a forum vendor if possible?

In this case

There is nothing wrong with a mechanical fuel pump, they last many years and need no safety devices. If the gear lube in chamber is changed every year during winter maintenance it will let you know if there are issues. My 1995 is on its 2nd Mech fuel pump and same sea water pump

Use electric fuel pump means no changing lube every year (or two) in sea water pump but need to add oil pressure switch to disable pump when motor is off.

If there is enough room in front of the motor, a crankshaft mounted pump can be installed and makes changing impellers real easy

No need for newer Gen pumps since your converting

Had a plastic pump crack and the only thing keeping my above water was 2 bilge pumps.

That's a pretty scarry situation, I'll be 100 miles out into the ocean counting on that plastic housing. It sounds like the factory pump with a $100.00 rebuild kit every season should be pretty safe. I'm planning to have a valve in between the pump and the outdrive, I added that thinking I may have to service the pump on the water but now that you mention it I guess it's a must. Thanks for mentioning it.
So what do you use, now?

Well after I had a cracked housing a month later the boat got hit by lightning on the lift. It melted the impellers on both engines. One impeller melted and pretty much fused itself to the plastic housing. So started engine had no water so pulled housing off and found that. Checked other side it was also in bad shape. They where only a month old. After the cracked housing I went with new housings and impellers. With that and all the wire that now needed replacing I pulled it all out mounted an outboard bracket and have twin outboards now.

I would like you said at the very least have a way to shut the water supply off. Talked to a few others and they have seen the housings crack also. If I still had the big blocks I would for sure go to a metal housing if doing offshore stuff. We like to hit the Bahamas so I would not use that crappy plastic housing.

The first day I starteed loking I found the Hardin stainless pumps and I though that was great, but I've see a ****pile of people talking about them leaking. I guess leaky isn't a bi deal compared to crackeed housing. I'd imagine the housing doesn't last cracked very long, probably turns into a gusher pretty fast. I was leaning towards servicing a factory pump every year and calling it a day. I still might go that route, I think most people get a year out of them no problem, as long as they don't get hit by lightning. Maybe it's better to go with the Hardin stainless pump, they make one that has two wear plates that you replace rather than the housing correct?

Here's some new info on the new Gen 7 Plus pump Hardin just came out with.

https://cimg2.ibsrv.net/gimg/www.off...49bc29f6c0.jpg
New Gen 7 Plus pump
https://cimg8.ibsrv.net/gimg/www.off...27603f5bf3.png
Advantages of new Gen 7 Plus

my hardins have worked perfectly for two years so far. they look great and i used a teague mounting bracket to mount them. you can use fittings that allow you to angle the outlets. dont know what the *****ing about them comes from.