Electric Pre-heaters
To determine the correct number for your application refer to the OEM Order Codes or call Customer Service at 800-328-2611 or 734-429-5665.

12VDC Electric Pre-heater
Identify the correct heater for your fuel processor on this pageThere are various configurations of electric pre-heaters and thermoswitches available for the Fuel Pro/Diesel Pro. These include 12VDC pre-heaters, 24VDC pre-heaters, 120VAC pre-heaters/thermoswitches, and combination pre-heater thermoswitches. The voltage and wattage ratings are stamped either on the sheath or the hex of each component for identification.
Prior to 2014, 12VDC pre-heaters uses a resistance heater (below). This style of heater has a smooth element and a gold color fitting.

After 2014, the DAVCO 12VDC Heater was changed to a PTC Heater (below). The PTC heater has fins on the element, a black cap on the end and a "silver" colored element. Note that the fitting does not have an extension on it.

120 VAC Overnight Heater
Install a 120VAC plug-in pre-heater for overnight cold weather elimination of fuel wax. The 120VAC Watt pre-heater warms fuel when your truck is sitting and freezing on those cold winter nights. Warm fuel won’t ‘wax’ and plug filters. DAVCO 120VAC pre-heater plugs into the same power outlet you use for engine block heaters. If your truck already has block heaters or engine heaters which connect to 120VAC plugs, you may be able to wire the DAVCO pre-heater into that same wiring harness using “Y” cord P/N 102015. Purchase the Y cord on the DAVCO online store.
Coolant Heat
Coolant Heat is available for the Fuel Pro 382 and the Fuel Pro 483.
To determine the correct number for your application refer to the OEM Order Codes or call Customer Service at 800-328-2611 or 734-429-5665.
Fuel Pro 382 Coolant Heat
The Fuel Pro 382 Coolant heat model has an extended bottom plate for the radiator, thermovalve and fluid connections. To determine the correct number for your application refer to the OEM Order Codes or call Customer Service at 800-328-2611 or 734-429-5665.
How it Works
Unfiltered, cold fuel flows from the fuel tank into the body of the Fuel Pro. Coolant heat is routed through the coolant manifold. The body of the Fuel Pro is warmed by the coolant and the heat is transferred into the fuel. The warmed fuel passes through the filter. The warmed, filtered fuel is sent to the engine. The coolant and the fuel paths are separate and there is no contact.
Coolant Heat Routing in Series
Fuel Pro 483 Coolant Heat
The Fuel Pro 483 model after September 2015 is equipped for coolant heat connections. An upgrade kit with instructions is for Fuel Pro 483 models installed before 2015.
How it works
Unfiltered, cold fuel flows from the fuel tank into the body of the Fuel Pro. Coolant heat is routed through the coolant manifold. The body of the Fuel Pro is warmed by the coolant and the heat is transferred into the fuel. The warmed fuel passes through the filter. The warmed, filtered fuel is sent to the engine. The coolant and the fuel paths are separate and there is no contact.
Route coolant lines in parallel
Return Fuel Heat
Return Fuel Heat is available for the Fuel Pro 382 and the Fuel Pro 483.
To determine the correct number for your application refer to the OEM Order Codes or call Customer Service at 800-328-2611 or 734-429-5665.
Fuel Pro 382 Return Fuel Heat

The Fuel Pro 382 Return heat model has an extended bottom plate for the radiator, thermovalve and fluid connections. To determine the correct number for your application refer to the OEM Order Codes or call Customer Service at 800-328-2611 or 734-429-5665.

How it Works
Unfiltered, cold fuel flows from the fuel tank into the body of the Fuel Pro. Heated fuel is routed into the fuel manifold. Returned warm fuel from engine flows into the housing when thermostat senses fuel temperature below 95⁰F. All returned warm fuel from engine flows back to tank when thermostat senses fuel temperature above 115⁰F. Warmed fuel blends with cold fuel and is sent through the filter.