E+D+J Fire pump system, with electric pump, diesel engine pump, jockey pump and control panel. Fire pump system E+D+J,Operation: 1 ... to electric pump capacity, fuel tank.3. Jockey pump, horizontal or vertical, 10, 15, 20, 30, 40, 50, 75, 100, 125...GPM4. ... protection for main electric pump, hand off auto selector switch for each pump, indication lamps for pump run and pump trip, pressure switch ...