Plantoil/diesel conversion basics
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danalinscott

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(Under construction)



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mcarman

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i'm using mr linscott's basic conversion diagram to convert an '88 190d mb.  would like to see a schematic and maybe some basic instructions for hooking up the electrical part.  like how to hook up "relay(s)" and the two 3way valves and the electric fuel pump for the veggie.  much thanks for any advice or suggestions      michael carman

danalinscott

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Are you using one or two electric pumps?


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mcarman

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am using one for veggie.  the mb lift pump for diesel.  as per your diagram i think.

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This one?


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that's the one

danalinscott

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I will look in my desk top computer in the office tomorrow and try to post the schematic by evening.

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thank you very much mr linscott

danalinscott

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Here it is:
I could not find the copy I had previously so I drew up a new one.

I have also posted this in the discussion on this conversion HERE along with a link to more info on the relays.

Let me know if you have any questions.


In Figure 1 the engine is not running and the Ignition Switch is off.

In Figure 2 the engine is running and/or the Ignition Switch is on. Return fuel is being sent to the diesel tank.

In Figure 3 the engine is running and/or the Ignition Switch is on and BOTH dash switches are on. (The engine is running on VO and the majority of return fuel is being looped with a small amount being returned to the VO tank.
The electric fuel pump and Injector Line Heaters are on.

In Figure 4 the engine is running and/or the Ignition Switch is on and the purge cycle has been initiated. (The mix of VO and diesel is being looped and sent back to the VO tank. When enough time for a complete purge has elapsed the last switch should be turned off.

This schematic uses lighted dash switches to make operation as obvious and easy to track as possible. If you choose to use unlit dash switches you may omit the switch ground.

This is the most basic schematic.
It does not provide the fastest possible purge.
To accomplish that an additional 3 port valve is required as is a slightly modified wiring schematic.

In addition some simple automation is an option.
But again..this requires a few more components and modification to the wiring schematic.


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mcarman

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thanks again !  very nice looking details !  i'll  be studying these hard.   sincerely,  michael carman

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FINALLY HAVE THE CONVERSION RUNNING!! SLIGHT PROBLEM.  THE VEGGIE TANK IS FILLING WITH I GUESS DIESEL.  AND THE DIESEL TANK IS GOING DOWN EVEN THOUGH I'M ON VEGGIE MOSTLY.  AM NOT SURE WHAT'S WRONG.  I'M SURE IT'S OBVIOUS TO SOMEONE OUT THERE.  HAVE TRIED TO USE MR LINSCOTT'S DIRECTIONS TOTALLY FOR THE 88 BENZ 190

danalinscott

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Is his posted in this discussion because you used the electrical schematics in this discussion?

This sounds like you may have the solenoid valves reversed.

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well thanks.  i took apart one three way valve today cause it leaked.  i think it's ok now.  i noticed in the diagram today that the tubing coming off the injectors for return fuel on mine still go straigt to the diesel filter.  you have them going to the tube from the inj pump, before the 3way.  is that correct. if so i guess i need to cut the small tubing from injectors and get a tee for to put it into the tube from inj pump before the 3 way.  then plug the other end before diesel filter  ?????  jumbled, sorry.  i'm so close to getting this done, i think.

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