Quote:
Originally Posted by Jeremy5848
An interesting concept. How is the vacuum gauge "wired" to show filter clogging?
|
First off the car runs on WVO so the entire plumbing of the fuel supply to the lift pump has been changed.
Original diesel fuel flow: tank > inline filter > fuel heater > lift pump > diesel filter > injection pump.
Modified diesel fuel flow: tank > inline filter > fuel heater > diesel filter > fuel selector valve > lift pump > injection pump.
VO flow: tank > short heat exchanger > flat plate heat exchanger > heated fuel filter > hose in hose fuel line > fuel selector valve > lift pump > injection pump.
There is a "T" in the fuel line between the selector valve and the lift pump. The vacuum line goes from that "T" to the gauge. Since the line terminates at that gauge, no fuel can flow up the line because there is no place for the air to go to get out of it's way.
With unrestricted filters the needle is barely off the peg. On a long road trip I get several hundred miles notice that the filter needs to be changed. I can then change it at a place and time that is more convenient to me rather than spending "store bought fuel" while I look for a safe place to do it.
The needle not jittery at all.
A write up of the conversion is here:
1991 350 SDL Conversion to WVO