From what I dimly recall of mechanic school a dozen years ago, no glowing when hot is a "feature" of the 6.5. Sounds like you have a bad pump. Last time I checked Stanadyne rotary pumps were relatively inexpensive. That one should have lasted longer, but maybe it was run on petrol or other bad fuel before you got it.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.