Describe your system.

How is the system configured?

If you have a purge valve should I assume you are running a regulated return?

Here to help- just fill in the details. :thumb:

 

Well ok. My conversion is based on the vegistroke checkvalve system. Check valves in the heads on the diesel side, plugged ports in heads opened up & veg is fed into the heads that way. 1/4" SS braided hose for the veg lines to the heads that are connected to a tee that goes to my FPHE whcich is located on the firewall next to the brake reservior. From FPHE I have TIH ( 3/8 aluminum tubing in 3/4: HH,) which runs back to my davco 322 filter head. I have 3/8 check valve right before the davco. Right before the check valve is a tee where the TIH from FPHE terminates & the hydraforce switching valve is plumbed for purging. Then a line returning to tank from the purge valve. Continuing to head back from the davco is my Fass HPFP internally regualted fully adjustable pump which I have set to 75 psi. Then another TIH which goes back to my 60 liter poly tank with hotfox pick up. Everything is plumbed with coolant of course & I also have a auxilliary coolant pump plumbed in the return coolant line for better coolant flow. I also installed a 203f t-stat.

So far it is working very well. I have vegi temp, pressure & fuel gauge in my pillar pod. I go by the factory temp gauge to know when to switch over. I wait until it is fully up to temp before switching. I am seeing veg temps of 180-190f on the road & 160 when ideling( no I don't idle for long periods on veg). The temp gauge is plumbed between the FPHE & the tee for the SS lines to the heads. That's as close as I could get it to the heads. I have had a couple of leaks to deal with from the tubing in the TIH but I hopefully have fixed them so they won't leak again. Time will tell with that though.

Like I said so far so good. I just want to make sure I am purging the correct amount. Not too much but definetely not too little.

 

Well ok. My conversion is based on the vegistroke checkvalve system. Check valves in the heads on the diesel side, plugged ports in heads opened up & veg is fed into the heads that way. 1/4" SS braided hose for the veg lines to the heads that are connected to a tee that goes to my FPHE whcich is located on the firewall next to the brake reservior. From FPHE I have TIH ( 3/8 aluminum tubing in 3/4: HH,) which runs back to my davco 322 filter head. I have 3/8 check valve right before the davco. Right before the check valve is a tee where the TIH from FPHE terminates & the hydraforce switching valve is plumbed for purging. Then a line returning to tank from the purge valve. Continuing to head back from the davco is my Fass HPFP internally regualted fully adjustable pump which I have set to 75 psi. Then another TIH which goes back to my 60 liter poly tank with hotfox pick up. Everything is plumbed with coolant of course & I also have a auxilliary coolant pump plumbed in the return coolant line for better coolant flow. I also installed a 203f t-stat.


So far it is working very well. I have vegi temp, pressure & fuel gauge in my pillar pod. I go by the factory temp gauge to know when to switch over. I wait until it is fully up to temp before switching. I am seeing veg temps of 180-190f on the road & 160 when ideling( no I don't idle for long periods on veg). The temp gauge is plumbed between the FPHE & the tee for the SS lines to the heads. That's as close as I could get it to the heads. I have had a couple of leaks to deal with from the tubing in the TIH but I hopefully have fixed them so they won't leak again. Time will tell with that though.

Like I said so far so good. I just want to make sure I am purging the correct amount. Not too much but definetely not too little.

Not to sound like a dumba$$, but I read all that and cant figure out why the hell you even have a purge valve. If the systems are parallel, just use a relay to switch the pumps, because on a dead head system the VO will burn off and be replaced to D2. No need to purge that way. Normally 60 seconds on a deadhead will be adequate. I run a RR and give it about 30, and it smells like D2 when it fires up on cold start. Sorry I could not help more.....

 

You don't have to have a purge valve but if you don't & just switch from veg back to diesel it takes a very long time to burn up the veg in the fuel rails & injectors before you can shut down. Like 5 to 7 mintues. Thats what I have been told by many. With a purge valve you can flush the veg out of the fuel rails in seconds & then run the engine for about a minute to burn up the veg still in the injectors. That is how many systems are set up including the V3.

 

5 to 7 minutes is a long time, it should only take 30 to 60 to clear the rail i would think. anyone know the diameter of the rail? i would like to know how much fuel is in there...

also, what you may have read is people who have systems that pull veg into their fuel bowl. you need a goot 5 to 7 minutes just to dilute the veg enough to reduce cold start voscosity. never get a true flush. i have one of those, not for much longer thoguh.

since you have a purge might as well use it. here are my thoughts, install a bleed screw or pull a line on the head and feed into a jug of some sort. have a buddy operate the key and time how long it takes to feed a sufficient purging amount of D2 into the jug. that should get you a resonable number.

 

Purge if you like, it will definitely be quicker. But, 5-7 mintues? NO WAY. I run two deadhead systems, and the check valves are back off the heads just a bit. Even then, I run D2 under two minutes, probably closer to one.

 

i know diesels use hardly any fuel ideling, so i will be flushing (deadhead) about 1/4 mile from the parking lot and driveway.

 

I'm just going by what I have been told & no the people that told me this have the same setup as mine. I know the vegistroke has a purge valve. Anyone know how much time that is set for?

 

Clay would know.

I have been thinking about this all day. It has been about a year since my last V3 install and I cant reacall. With check valves in the service ports, I cannot for the life of me figure out how any D2 could ever get back to the module on the V3-thus I still maintain the engine consumes the VO while being replaced by the D2........:dunno:

 

This the discussion I have going on Frybrid about this.

Purge time - Forums

Your probably right about 5 to 7 minutes being way out to lunch on my type of setup. I got that confused with conversions that both D2 & VO go through the stock filter. But purging is suppossed to cut down switchover times alot & better insure the fuel rails & injectors have no VO left in them. Again that's what I have been told & the reasoning behind it.