I spent quite a bit of time under the car looking for the best place to run my fuel lines. I needed two hose-in-hose (see below for an explanation) which ran from the trunk where the WVO tank will be located to under the hood. I've seen conversions where the lines were ran inside the car under the carpet, and I've seen conversions where the lines were ran under the car. After much contemplation and examination of the car and schematics of the car I decided to route my lines under the car.After studying other conversions of this car and laying under the car for what seemed like forever I decided to follow the existing fuel lines. The big question was where to enter the trunk. I noticed there was quite a bit of unused space just to the left of the stock fuel tank behind the stock fuel tank mounting bracket. The only problem I could see with this location was I would have to remove the fuel tank, and my fuel tank was almost full. So I put off pulling the fuel tank for a week to burn off some fuel. I then drained the remaining fuel and pulled the tank.
After pulling the stock fuel tank I drilled two holes next to each
other and then cut away the "little triangles" between the holes. I then filed the edges smooth.
To protect the hose-in-hose set up from rubbing and most likely getting cut on the metal edges I slit a section of 3/8" fuel line and slid it over the edge of the sheet metal. This fuel line was then glued in place using silicone.
****The need for two hose-in-hoses****
First off a diesel engine does not burn all of the fuel delivered to the engine. The unburnt fuel is sent back to the fuel tank. So, in a WVO conversion there is a need to provided a return line back to the WVO tank to avoid cross contamination between the two fuels.
So why the hose-in-hose set up?
There is a heating element inside the WVO tank to heat the oil in the tank. This heating element gets its heat from the cooling system of the car. So there is a need to run two lines to carry coolant from the engine bay to the heating element in the tank. Well if you are running the lines to carry the coolant you might as well run the WVO fuel line inside of them to heat the WVO while it travels to the engine bay. Each heating element with in the system can only heat the WVO by a certain amount. So if you figure the WVO fileter housing can raise the temprature of the WVO by 10 degrees and the WVO starts off at 60*F then the filter housing will raise the WVO to 70*F. So, if you can heat the oil (via the hose-in-hose set up) to 90*F by the time it gets to the WVO filter housing then not only will the filter perform better, but the temp of the WVO that leaves the WVO filter will be even hotter.
Some people favor a hose on hose set up, however in my professional opinion there is too much heat lost to the environment and the rubber lines make poor conductors. This is also one of the reasons why I used aluminum for my fuel lines. Aluminum is a great conductor of heat and allows the heat from the coolant to be transferred to the WVO.
