STC-100 Diesel Fuel to SVO Conversion BUILDER'S Kit for Factory Tank Operation

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NOT a complete kit. Read carefully below. You should have experience with these type conversions. Special Price. No further support other than videos is offered.

The included video instructions are for 1977 to 1985 diesel Mercedes models 240D, 300D, 300TD, 300CD, and 300SD.  STC100 SVO conversion. STC stands for "Single Tank Conversion" (meaning you will use just the factory tank for both diesel and vegetable oil). 100 is our short BUILDERS kit (meaning it is not complete, and you will have to supply other components of your choice. SVO stands for "straight vegetable oil." This can be either new oil or waste cooking oil. This is NOT biodiesel.  PLEASE NOTE: Experience required. This is not a beginner's kit. You will need a good understanding of the diesel fuel system and automotive electrical wiring ( or someone to help who does).  You will also need electrical wiring tools and additional wiring terminals to complete the installation successfully. The videos are complete, so any additional personalized installation help is not provided. This is what is included.

STC-100 Diesel Fuel to SVO Conversion BUILDER'S Kit for Factory Tank Operation $188.00Sale
$150.00
SKU:
SVO-STC100SHORT
Free Add-Ons Included:

How to Install a Large Aftermarket Filter for Running SVO Fuel in Your Diesel - On Demand Video

SVO Single Tank Conversion STC Fuel Hose Kit Installation Part 1 - On Demand Video

SVO Single Tank Conversion STC Fuel Hose Kit Installation Part 2 - On Demand Video

STC100 Conversion Wiring and Electrical Component Installation Instructions - On Demand Video

SVO WVO Flow Glow Fuel Booster Heater Wiring Tips - On Demand Video

Product Details

  • Electrical wire and components to power a fuel pump and electric boost heater.
  • Fittings and valve to modify your fuel system to "loop mode."
  • 3-way valve and fittings to move from normal return to loop mode
  • Kent's video instructions on installing our entire kit, which is no longer available. 
  • Operational procedures

The real value here is in the detailed video instructions that Kent will share when doing the full conversion on a 1983 300D. The instructions will show a different type of fuse box fuse boss assembly with 5 to 6 relays. This is not necessary for a single-tank operation. You really only need two relays and two switches which are included in this builders kit. Be sure to watch ALL the videos before you begin.

This is the three-way valve and fittings you will use to convert your fuel system to loop mode. This is explained in detail in the video instructions.

You will need to source and supply the following on your own.

  • Large SVO filter and mounting brackets (video will show example purchased on Amazon)
  • 5 to 8 psi electric boost pump (video will show example purchased on Amazon)
  • Electric boost HEATER if you operate in colder climates - see note below*
  • 1/4" and 5/16" fuel hose
  • All hose clamps as required ( video shows pinch clamps but standard clamps can be used )
  • All wiring terminals as required
  • A good understanding of automotive electrical wiring

*If you plan to drive in cold climates (freezing and below), you will need to add a fuel boost heater to heat the vegetable oil fuel before it enters the injection pump. See related products below to order separately.

If you would like a complete assembled kit ready to install in your W123 diesel, as of August 2026 we still have the full kit that was used to create the videos that are available to do this conversion. This was in the car and only used for two or three hours of operation and then removed. See the related products below for more information.

Related Products:

$118.50

SVO Single Tank (STC) to Dual Tank (DTC) REQUIRED "Extras" Kit.

Applies to Kent's kit only. You will need this extra valve, hose, and hardware, along with video instructions.

These are the additional components required to run your old Mercedes diesel on dual tanks (DTC) when using Kent's conversion kits or methods.

Sale
$499.00

W123 Dual Tank Diesel to Vegetable Oil Conversion - Assembled Kit Used

Will come with video instructions so you can complete your conversion - 5 videos plus Extras included.

You can also use this as a STV  "single tank conversion" SVO WVO by changing the hose routing, removing one valve, and not using the extra pump. Watch the video below. Kent will explain in detail how this is installed. 

Electrical components are pre-wired.

$95.00

SVO WVO 12v Flow Through Electric Fuel Heater - Vegtherm

No extras other than mounting straps as shown. Install the heat vegetable oil just before in enters the injection pump

This is the veggie heater that was commonly used during the height of the veggie oil craze (2004 - 2012). This has been used lightly and is still in good working condition. No instructions. Must be operated by a separate electrical circuit with a relay activated.

$130.00

Heavy Duty Electric 3-Way Fuel Switching Valves for SVO WVO operations

Very expensive new when available in the early 2000's. This is our last set!

These are the exact units you will receive with the fittings attached as shown. They have been tested, so some fuel has been run through them, but they have not been mounted or used in a vehicle. There are no instructions included.

Sale
$58.00

SVO WVO Heavy Duty Rotary 12 volt 4 to 8 PSI fuel pump

Strong enough to move thick veggie oil from back of car up to the engine compartment.

A very efficient fuel pump with good volume output at low psi.  Open box and tested, so it has had fuel run through it for video purposes. Less than 20 minutes of run time. Comes with mounting bracket and fittings for 3/8 inch fuel hose, as shown.