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Because they can be expensive. You cant get them at a local parts store. They need electrical power. They need to be wired into electrical power. Its hard to tell when they have stopped working. They may pump too little coolant. They might pump too much coolant. Unless you can get direct bolt on you have to fabricate stuff. You will have to rearrange your accessory drive, which involves fabricating brackets most of the time. Its an additional load on the limited power the electrical system can provide. The weigh more than the belt driven pump.
And maybe more reasons that I cant think of right now.
One of the reasons I do like the electric coolant pump is that I can use it to circulate coolant through my 5500 watt coolant heater.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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