Plantoil/diesel conversion basics
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danalinscott

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Under construction

These are pretty basic to convert with a few special considerations.
1. They have no separate fuel pump. The Injector Pump also acts as the lift/fuel pump. This places the entire fuel system under vacuum and so exacerbates the most common "bug" in new conversions. (Air leaks into the fuel lines)

2. They appear to be more susceptible to piston/ring/land/groove coking than many other diesel engines of that vintage.

To adapt to #1 I suggest using two inexpensive low pressure electric fuel pumps to "push" fuel to the IP. This also simplifies the conversion configuration a bit.

Adapting to #2 requires that you make certain that a compression test indicates that there is very little blow-by and retest regularly (every 10K or so) AND check lube oil for any signs of polymerization at every oil change.

The basic conversion schematic I suggest using is
#15 or #16 shown HERE


 

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agil3

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Hi Dana, Thanks for the unbiased opinions. I am gathering more info on converting my 1981 Caddy to a two tank system. In a past post you said , in your opinion not to use a lift pump with more than 7 psi. I found two vendors on eBay  selling Facet electric fuel pumps. One is rated at 2-4 psi & the other is 4.5-7 psi. Both pumps are brand new & between $30-$50 including shipping. Do you think the 2-4 psi or the 4.5-7 psi pump would be the best choice for this 81 Caddy conversion? Thank you for your help, agil3
danalinscott

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I believe that the lower psi pump will suffice. I am not sure if the higher psi pump will overpressure your IP but it is best IMO to play it safe.


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agil3

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Thanks Dana, I'll keep you informed on how my conversion is going.
danalinscott

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vwild

Registered: 02/15/08
Posts: 5


Old post Yesterday at 08:53 AM Reply #6

Here's the configuration so far. I decided on a 20 plate FPHE.
I'm still working on the fuel tank. I hope to place it in the spare tire area under my truck bed.
Where might I find a "needle valve" for the limited return?
I'm still confused about parallel vs series coolant configurations, - how should I route my coolant?
What would you suggest to improve my system?
Thanks for all your help!


Quote:
Where might I find a "needle valve" for the limited return?


Most hardware stores carry them in the plumbing section.

Quote:
I'm still confused about parallel vs series coolant configurations, - how should I route my coolant?
 


I think that a series circuit with a parallel loop will probably work best for you. There is a schematic of one in THIS discussion.

Quote:
What would you suggest to improve my system?
 
I suggest using a configuration simialr to
#15 or #16 shown HERE   You can omit the Vegtherm IMO.


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