Technician A says that the primary filter helps extend the life of the secondary filter. Technician B says that the primary filter is located between the engine's high-pressure injection system and the secondary filter. Who is correct?

Technician A says that a fuel heater located in a filter housing is the best way to prevent wax and ice crystals from restricting fuel flow. Technician B says that ethanol can be used to dissolve wax and prevent water from crystalizing in fuel filters. Who is correct?

Technician A says that a float sensor in a filter housing can be used to measure the level of water and determine when the filter should be drained. Technician B says that a probe in the bottom of a fuel filter, which measures the difference between the conductivity of water and fuel, is used to switch on the water-in-fuel warning lamp. Who is correct?

Technician A says that primary filters typically use chemically treated paper filter media with a micron rating of more than 10 μm. Technician B says that synthetic filter media is used to separate bound, or coalesced, water from fuel inside a primary filter. Who is correct?

Technician A says that coolant is used to heat fuel in fuel-water separators. Technician B says that electrical heating elements keep water and wax from plugging the filter in a fuel-water separator. Who is correct?

Technician A says that a gear pump requires no check valve to prevent fuel from draining back to the tank. Technician B says that a leaking hand primer pump check valve will allow fuel to drain back to the tank even if there is a gear pump. Who is correct?

Technician A says that a restricted fuel filter will produce a low-power complaint under load but will not cause the engine to stall at idle. Technician B says that hot fuel can cause a low-power complaint under load but will not cause the engine to stall at idle. Who is correct?

Technician A says that electric priming pumps prevent suction-side air leaks in a fuel system. Technician B says that electric priming pumps are used to purge air from the suction-side fuel lines during filter changes and before engine start-up. Who is correct?

Technician A says that the best indication of when a fuel filter should be changed is based on how much distance a vehicle has traveled. Technician B says that the fuel filter should be changed whenever the oil is changed. Who is correct?