Here's a little background on the 5.7 if anyone is interested.
The original pump was a great unit that normally provided many years of service. Somewhere along the line, the supplier for the pressure sensor went out of business leaving SF high and dry (pardon the pun). SF had to redesign the pump, and for what ever reason couldn't seem to get it right. Most were lucky to get a year or two out of the new design and SF replaced many under their warranty. Finally, SF came out with the 4048
I personally had 4 of the new design 5.7's replaced, the last of which was replaced by a 4048 which is still going strong after 3 years.