Trash pumps with diesel engines are often to get water out of the way so your crew can get back to work.
The longer they stand around, the more it costs. When maximum output is the objective, this is the group of trash pumps with diesel engines that produce. And they produce at dynamically tested, CPB Certified levels, not some theoretical laboratory estimate.
Because these trash pumps with diesel engines are hard to beat for portability, convenience and reliability, they form the largest selling category of trash pumps.