The conversion is now complete

12th April 2013. I spent the day at dieselveg in Wolverhampton while Bertha was converted by the guys at DieselVeg.com. It is widely believed around the Internet that its not possible to run the PD engine in the 2004 vw t5 1.9 on vegetable oil. I suspect that this is because there are a few areas to watch out for when performing the conversion

1. You have to use a large extra tank for the vegetable oil rather than a small extra tank for the diesel and the main tank for the vegetable oil. The reason for this is that there is an in-tank high pressure pump which will quickly fail if run on vegetable oil.

2.  You have to fit an auxiliary fuel pump to pump the veg oil from the auxiliary tank, you cannot rely on the mechanical pump driven the cam on its own to pull the oil through.

3.  You have to fit two heat exchangers, one to warm the oil up to temperature and one to cool the return flow from the PD injector spill off. The hot oil from the injector spill off will trigger a de-rate if it s not brought back to normal temp.

4. You have too filter your oil down to 1 micron prior to putting into your tank, to be honest, this goes for any engine running on veggie oil.

View showing the solenoid valve, pump cooler module 

62l fuel tank bing installed