And now a simple explanation of why your car may get crummy fuel mileage... Have you considered that your odometer is slipping? I've never been able to get my 300D's mileage because of that fact. (2 different speedos too) Check your odometer when warmed up (that's when my slips) against mile markers. If it is less than the markers... then you know the problem. The resolution is to have the odometer gears fixed to the shaft.

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Pete Williams, President emeritus - MBCA-International Stars (Eastern Mich.) Now Wi. & Az.
1985 300D Manual 4 speed Green Hen's tooth
1979 MGB triple black Az car nice
1969 back 1/2 of MGB (Az home built trailer)
1991 Volvo 245 Wagon Nice AZ Restored Gold Brick
1983 Jeep CJ7 37,600 Miles Summer use only

Those lines are nylon, too stiff to be clamped shut without destroying them. Even the tiniest flow through the clamped line will result in no pressure increase.

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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