Thats what I thought about the lift pump but it seems to be common practice to replumb it the way I did when running a WVO setup. This way the filtered diesel and seperately filtered wvo meet at the valve just before the lift pump and you aren't running wvo thru your diesel filters. I'd sure like to keep the liquids in their respective filters. I have an inline electric pump pushing the wvo up to the lift pump and maybe should put one in the diesel line as well.
So far I've had no power loss at these vacuum readings and all seems fine. Just wondered if it was out of the ordinary.

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'84 300SD, '87 300SDL, '81 300SD