andrewjtx - I don't want to step on anyone's toes here but I'm not really talking about alt fuels here. My vehicle does/did run some alt fuel but I'm currently looking for assistance in determining if my IP or LP is faulty. Just because I have altered the vehicle a bit does that disqualify me from asking questions here? Just asking that in a friendly way.

funola- The stock LP does not seem to be used when I'm on the "diesel" side with the electric pump. The mechanical pump pumps from the original tank which has had WVO in it as well as biodiesel. I'll try to make a diagram later today.

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"Gerwalt" 1984 - 300TD

and accurately drawn diagram will help. the engine driven mechanical lift pump is pumping all the time and requires fuel flowing through it all the time for cooling & lubrication.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

No, not at all. Just thought the folks that frequent the alt fuels might make more sense of all this.

I watched your video and got dizzy. Some of these WVO setups look so complicated that I think the people putting them in could've spent the same amount of energy turning the WVO into BioD and then running it in an unmodified 123...

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'85 300TD "Puff The Magic Wagon" - Rolling Resto
'19 Mazda CX-9 Signature - Wife's sled
'21 Morgan 3-Wheeler P101 Edition
'95 E300d - SOLD
'84 300TD "Brown Betty" - Miss this one
'81 240D "China Baby" - Farm grocery getter