The amperage pulled from the alternator is not going to effect the drag on the alternator/belt and it is less than 25 amps anyways. At least the fuse for the pump is 25 so the actual draw is going to be less than that. And a pump failure is going to leave you stranded either way. I've seen more belt failures than pump failures and in that situation your not stranded, you can go until you run out of electricity in your battery. I have had more failures of belt driven pumps (3) and none with Meziere electric pumps. Now I have only had them in a few of my cars so my data might be a little skewed, but they have all been daily drivers driven at the track. In all my years of wrenching on peoples cars I have done dozens of pump changes, none have been electrical pumps (that were broken). Too many pluses for me not to have one.I have heard on a daily driver that electric pumps are bad. They still draw current from the alternator so they aren't freeing up as much as you might think, and they have a higher failure rate than a belt driven pump. On a drag car, no biggie, cause ur at the track. On a daily driver it can leave you stranded.
Plus and minuses to everything.
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