[kennyredfield]

Hi There,

This might be of interest to budding WVO's.

During the course of converting a Mazda 2.5 Turbo (indirect injection, Zexel rotary IP) I had trouble getting the 12volt fuel pump (Holley Blue - vane type) to work consistently.

To give it a helping hand I decided to place the WVO return line before the pump (and WVO filter). The assumption being that the return lines hot WVO would make the pump perform better and allow the WVO to pass through the filter easier, thereby further aiding the pump.

Big mistake:

My fuel filter is a standard 'glass bowl' unit available from any diesel/hydraulic shop. The filter cartridge sits between the upper housing and the glass bowl and contains what looks like pleated paper or cardboard. The same model has had over 1000 litres of cold WVO (pre-filtered to 1 micron) gone through it without a cartridge change in my Toyota BJ42.

However, in the Mazda after only a few hundred kilometers with the return line in front of the pump/filter, the paper in the cartridge started to disintegrate and bits of fluffy paper mache blocked the metal mesh filter in the IP, thus stalling the engine.

According to the filter supplier these diesel filter cartridges are NOT suitable for HOT liquids, diesel or otherwise! They suggested to use engine oil filters instead, which are obviously designed to take hot oil.

If any of your guys/girls are running hot oil through their filters, please post a reply here - I'b be interested to know how you fared/what filter you use, etc.

Best regards,
Kenny