I use the pumps that Tracy sells set up in parallel. I had one fail after about 150 hrs. The failure mode was very soft. It just stated making lower output. Since the pressure is set by the regulator, I only noticed that the pump was failing because the normal fuel flow started dropping off dramatically over the course of a few hours. Normal pump output at 35psi is about 40 gal/hr. With both pumps on the flow is 80 gal/hr. When the pump died flow fell off to about 20 gal/hr without a drop in pressure.
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