I have seen these recommended a few times for replacing the OEM Merc seawater pump mounted mechanical fuel pumps as an upgrade. Do any of you have any experience using them? I am considering one, and the price is very high and am wondering if its worth it. http://www.cvproducts.com/ProdDet.aspx?PN=SPIN-MP-2630

I have used plenty of then, block mount or seawater pump. It's a great pump, 100% rebuildable. you can change out the diaphragm spring also for higher pressures. There are fiber check valves 5 of them, hardest thing to change. They use a spiral lock, like a lock for a piston wrist pin, except smaller.

I run them and they are awesome as MER said. The last fuel pumps you will prob ever have to buy.