The actual fuel line is HWH.
The lines running next to it are coolant return to engine and vegy return to tank.
Here's another look at the vegy filter:
The hose with the dotted line is supplying coolant (coolant doesn't mean it cools anything, should I say heatant?
)to the HWH, notice when it meets the HWH it goes in 2 directions. Half goes back to the tank and the other half goes through the filter heater and onward toward the engine. That allows twice the coolant flow but also requires 2 return hoses.
The hose with the solid stripe is coolant heading back to the engine from the tank, after heating the oil in the line from the tank to the filter.
The brown PEX line running past the filter is the return to tank. I don't use it often but it works great when it's time to purge air from the line. I run a looped return and believe that every once in awhile fuel in this loop needs to be flushed back to the tank and sent back through the filter.
Here's a look at the gasser waterneck with the extra 5/8" port, used for supplying coolant to the HWH (dotted hose), and the place coolant from the tank is returned to (striped line):
I had 2, 3/8" ports welded onto the metal coolant return line, for the returning coolant. Cleans it up, looks better than a "T" and hose clamps.
Many of the improvements I make on each new system I install are about making it look cleaner. This time I ran the fuel/coolant line bundle through the rocker panel under the doors. This is alot easier on a 2 door. On a 4 door there is very little room between the rear door and the wheel well. I had to cut a route and cover it with a shield:
That was the most difficult part of the conversion... I dreaded having to mess with it. The shield looks worse now after loading the car so heavy with car parts coming back from Osh Kosh Golf part out. It rubbed when I went to leave, I had to remove the wheel and take a hammer to it,.. it still rubbed occasionally on the way home. Ha, I probably should have put the Golf springs on the rear of my car before I loaded it.
Here's the heating and pickup tubes that were installed inside the vegy tank:
The center tube is obviously the pickup. I took a cuttoff wheel and cut slots halfway through the tube all along the bottom. It pulls fuel past the hot outer tubing loop that surrounds it. The extra ports on the flange are a fill port and a barbed fitting for the return-to-tank.
'91 Golf gasser converted to a 12mm pump, M-TDI.
'84 1.6TD Rabbit with a VNT-15 turbo, still setup to run on vegetable oil.
'84 GTI with 1.7TD pistons and intercooled.
2003 TDI wagon
2000 TDI Jetta.
I see you've gone the hose on hose route for this one; I remember when I saw the Fatmobile you were using hose in hose, any reason for the change? I used hose on hose for my Rabbit and F250 and it seemed to work pretty well.
