this is the one mod id add if i did it all over again. the system i have runs under vacuum from the lift pump (which is not self priming). some pressure to overcome vac leaks is a wonderful thing. the diesel side is a nightmare to get all the air out.

I have a self priming lift pump to stitch into that system at some point when I get a chance.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car