Waste Vegetable Oil Conversion for Diesel Bus

Step 7 Heated Screen Filters

The heated fuel line carries the fuel through these two heated screen filters with a 20 micron asbolute rating. Unlike the sock filters seen earlier, this micron size actually means there won't be any particles in it larger than 20 microns.
They are Volkswagen motor oil coolers from a junkyard. Each unit has a water hose in and out and a fuel line in and out, so there are plenty of hoses to delight the senses.In the original car, the hot engine coolant is cooler than the hot motor oil, meaning the heat exchanger in this case will heat the engine cooant and cool the motor oil.
In this case, the hot engine coolant exchanges heat with the cooler vegetable oil, raising the vegetable oil temperature as it passes through the metal screen filters.
They work great for that.

The filters are plumbed in parallel to decrease resistance, that is some fuel goes through one filter and some through the other.

The first photo shows a filter with the can removed.
These pleated screen filters seen here are handmade and intended to be used for motor oil.

Comments

[jonveggiebus]

 if you got the oil coolers from a junk yard, where do you get replacement filters?