Plantoil/diesel conversion basics
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bombthreat

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Posts: 3
Reply with quote  #1 
I'm very new to this and planning a system for my 1993 7.3L Ford. Which will be used in Upstate NY. In this configuration, I deleted the stock mechanical fuel pump and replaced it with electric pumps, also plan on using HOH for the fuel line heating.. I'd really like to hear what your thoughts are. Thanks!


longwolf

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Reply with quote  #2 

Hi, I'm new to the forum and looking into making the conversion.
There's some great info on this site!
But it looks like there isn't much activity, I hope it's still 'alive'.

I've studied the Configuration schematics thread and have a couple of questions about bombthreat's design.

1. Is the 3 port switch valve before the IP needed, or will the electric motors prevent a back flow of fuels to the wrong tanks?

2. It looks like his VO return line could return a small amount of diesel to the VO tank. I think I like that idea better than returning a small amount of VO to the diesel tank, but would it cause a problem in the VO tank?

3. Does this design allow for a proper purge mode? It doesn't look like it.

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danalinscott

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Reply with quote  #3 
Quote:
But it looks like there isn't much activity, I hope it's still 'alive'.


This forum is actually a space intended to present information in a more linear way that most of the active forums allow and discuss new ideas without the distraction of trolling.

Quote:
I've studied the Configuration schematics thread and have a couple of questions about bombthreat's design.

1. Is the 3 port switch valve before the IP needed, or will the electric motors prevent a back flow of fuels to the wrong tanks?

 


The switch is probably not needed but two good one way valves are. Some electric fuel pumps have these..and some don't.

Quote:
2. It looks like his VO return line could return a small amount of diesel to the VO tank. I think I like that idea better than returning a small amount of VO to the diesel tank, but would it cause a problem in the VO tank?

 


The "air trap" will send a very small amount of diesel to the VO tank but that is not a big problem. And since the likelihood of air bubbles in a configuration with twin "pusher" pumps is almost zero it is probably not needed and can be eliminated or plumbed into the VO side of the system at the filter. It would then not be pressurized when diesel is being used and should not return ANY diesel to the VO tank.

Quote:
3. Does this design allow for a proper purge mode? It doesn't look like it.


Designs like this are intended to purge by delaying the loop switch for  several minutes after the main fuel switch is made. The vo in the shared section of the loop will then be used up and replaced with diesel before  the second 3 port valve switches the looped return to a full return to (diesel) tank. If one is careful this will work well. You need to determine how long this takes (and always allow that much time ..and a bit more) or Vo will be sent to the diesel tank. Again..this is not a huge problem unless the VO% in the diesel gets over 5% at which point cold weather starting may become more difficult and ring coking may accelerate a bit.



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