Small 12-volt diaphragm pumps used in ATV sprayers must be chosen carefully. The original pump included with the spray tank, rated at 1.2 gallons per minute at 60 pounds per square inch, struggled to produce enough flow for the boomless nozzle. We replaced the pump with a SHURflo 2088 pump rated at 3.6 gallons per minute at 25 pounds per square inch and mounted it outside the enclosure on the tank to keep the pump from getting hot (figure 7).

Reducing the speed of the pump with the Micro-Trak electric pump driver will not hurt the pump, according to a technician at SHURflo. The pump performed well in our spray tests. Pumps should have Viton valves and Viton or Santoprene diaphragms for herbicide applications.

Figure 7—The SHURflo 2088 12-volt diaphragm pump is rated at
3.6 gallons per minute at 25 pounds per square inch.