The extra long hose-on-hose allows filling the 12 gallon Tempo PBW tank outside the vehicle, avoiding those inevitable spills. The custom hose-on-hose design plans can be purchased from Vegoil Conversions.

We use the Minnesota made Arctic-Fox brand HOTFOX heated pickup to heat the oil in the tank. We source our HOTFOX through PlantDrive.com. The special fittings are from Parker. The HOTFOX works like the flame on a candle. Just as a candle heats and melts wax which pools around the flame, the hotfox only heats the oil around the pickup, and lets the thicker stuff slowly slump to the middle. We believe this system is more efficient than trying to heat the whole tank.

The hose is routed partially inside the vehicle for extra protection from Alaska winters.

Here is one possibility for interior hose routing. We made as few modifications to the vehicle as possible.

The hose passes through an existing floor drain, which has been slightly enlarged, and the carpet cut out over it. We used 1/4" fuel line, sliced down the middle, and secured with zipties to protect the hose from the sharp metal. This was all sealed with Permatex Ultra-Black Hi-Temp RTV Silicone.

We use a piece of angle iron to attach the hose, heat exchangers and wiring within the engine compartment.

The coolant lines in the HOH tap into the heater core lines. Hot coolant comes from the head, and loops in 3 parallel circuits. One, through the heater core, Two, Through 5/8" line into the Flat Plate Heat Exchanger (FPHE), and Three, through the HOH lines. We use brass PEX 3/4" fittings to tap into the heater lines. The flow is limited through the FPHE by a 3/4" PEX ball valve to keep enough coolant flowing back to the tank. 16 plate FPHEs (larger for trucks) can be obtained through Vegoil Conversions.

The fuel line from the HOH enters the FPHE on the bottom, and exits the top, allowing air to purge from the slow moving fuel. The hot coolant enters the top and exits the bottom, giving a counter-current flow. The pre-heated vegoil then flows to the filter. The heated filter plans can be purchased from Vegoil Conversions Larger trucks would need a larger filter, such as the VORMAX from PlantDrive.com or the DAVCO filter from Frybrid.com.

From the heated filter the vegoil passes to a 6-port Pollak valve. This switches between the vegetable oil and diesel tanks and also switches the fuel return line so extra diesel fuel and any air bubbles in the system go back to the diesel tank, while the vegoil side is looped back into the vegoil feed, recycling the heat back into the system.

We source our valves, with a handy forgot-to-purge buzzer from PlantDrive.com These plastic bodied 6-port Pollak valve can be upgraded with two 3-port valves such as the Hydraforce valves from Frybrid.com or the new high-flow 1/2" valves from PlantDrive.com.

Next, the fuel then passes through the 12V VEGTHERM (also from PlantDrive.com) self-regulating electric vegoil heater, which is controlled separately from the valve.

From the VEGTHERM the fuel passes through a sight glass and into the injection pump. between the VEGTHERM and the sight glass is a brass T fitting to connect the vacuum gauge.

The VEGTHERM and the valves are on two separate toggle switches. The amber light is controlled by a thermoswitch on the VEGTHERM that tells if there is power to the veghterm and if it's at temperature. The green light reminds you that you're running SVO. If the SVO switch is left on when the vehicle is off, an alarm will sound. The vacuum gauge tests for restrictions in the lines. If a line is blocked with cold, solid fuel, or if the filter is plugged, the gauge reading will increase.

Thanks to the Alaska Biodiesel and SVO network for free advice and for connecting straight veg and biodiesel folks in Southcentral Alaska. Alaska VegOil Services is available to convert your diesel today!