I seem to remember a LR bulletin about fitting a spacer to the lift pump to stop an overstroking issue. I can't find it on TOPIx though.
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Found it. It was issued later than I thought.
19/01/97EN
Fit revised gasket ERR7339 to prevent the pump overstroking.
Thanks, Scott. Just called Brad and he'd done that - just about to take it for a test drive.
The first pump lasted less than an hour, the second long enough for the owner to get to near Penrith from Mt Tomah.