lots of comments about the aux pump but did you hear anything about 617.912 spring?

I'm also wondering if the 617 M pump lift pump uses the same spring.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"

Well, the valve adjust didn't do anything for the car. A little surprising since most of them were well out of spec. OTOH, the last time I adjusted them they were all very tight and the car ran worse after the adjustment. It actually took a week or two of driving for the "performance" to return.
I'd be willing to try a different lift pump spring. I'm sure it can't hurt. However, as many have mentioned, it would be wise to install a gauge prior to this.
Anyway, I highly recommend the FD change. I have been able to cruise at 75 mph and actually reduced the 0-60 time for the car. The other night I passed the guy I bought the car from (I didn't recognize him) and he called me right away and asked if I was running jet fuel in the car? This mod has literally made me rethink my plan to sell the 240D and buy a 300D turbo. Sure, the 300D turbo would be a nice thing but for the majority of my driving my car is now just fine. And, I keep the simplicity and maintenance history of my car.
Just avoid 50-60 mph and make sure you plan ahead for inclines.
Thanks for all the comments!

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1983 M-B 240D-Gone too.
1976 M-B 300D-Departed.

"Good" is the worst enemy of "Great".

not sure about the 300d (aprox 125hp I heard), but i'm using every bit of the 71hp the 240d has!! I'm finding it takes more concentrated effort to drive the 240d. When momentum is a B1tch to loose you got to plan ahead and take action planning / anticipating how to drive along the way maintaining speed if you can. Cars with HP on tap have spoiled me. This is a enjoyable challenge to drive.

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2006 Jetta TDI DSG 320k miles
1997 Ford F150 325k miles 4.2L V6 "Work Truck"
2008 Tundra 225k miles 5.7L
1982 240D.....sold
1984 300D...Totaled OUCH!
1985 300D Turbo 222k miles "Dos" sold to 79Mercy
1986 300SDL 98K miles "The Beater"....sold
1987 190E 2.3 16v Euro spec 115K miles....sold