If you use two valves in a system, switching both back from VO to diesel operation sends the VO between the two valves into the diesel tank. Purging will flush this into the VO tank. Mixing diesel into your VO is preferred to mixing VO into your diesel.

This is where understanding & proper operation of your system come in. The below relates best to my particulars. My system uses (well it's torn apart right now) one valve to switch the supply- For valve 1, the normally open (NO) port is piped to the diesel filter, and the Normally closed port (NC) is piped to the VO filter. The common port goes to the lift pump that has the output directly connected to the IP instead of to the diesel filter. Valve 2 has the NO port piped to the diesel return and the NC port piped to a T in the VO line. The common port picks up the injector overflow.


When no valves are energized diesel is sucked from the tank, and injector overflow goes back to the tank on the return line.
Energizing Valves 1 and 2 runs it on VO. Injector overflow loops back into the VO line.

Energizing valve 2 only runs diesel through the IP and injector overflow and then pushes diesel back down the VO line. The period that valve 2 only is energized is what I call my purge time. I think I used 20 seconds at light throttle. Yours will vary, can be determined by experiment. An inline sightglass may be useful.

I'd verify my purge time is appropriate, run the diesel tank dry and then change the diesel filter out.

__________________
CC: NSA

All things are burning, know this and be released.

82 Benz 240 D, Kuan Yin
12 Ford Escape 4wd

You're four times

It's hard to

more likely to

concentrate on

have an accident

two things

when you're on

at the same time.

a cell phone.

www.kiva.org It's not like there's anything wrong with feeling good, is there?