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My manual is for the military MK model. The MK engine was a multi-fuel version of the 330cu in diesel engine with an injection pump that could be set to suit aviation fuels as well as diesel.
The transfer pump (on the MK) is an electric pump.
You describe a hand lever, suggesting that yours is a mechanical (engine-driven) lift pump.
My manual shows a shut-off tap between the fuel tank and the primary fuel filter (there are two filters on the MK model). The primary filter is between the tank and the delivery pump (not the injection pump).
Maybe your tap (if yours has one) is partially blocked?
Otherwise, your lift pump should be capable of freely-delivering fuel (if you disconnect the outlet pipe). If the fuel doesn't flow freely then that is your problem.
There is no filter (or anything similar) inside the tank (of the MK) so fuel should be able to be drawn easily from the tank by the lift pump.
If you cannot easily suck fuel from the tank, there might be an obstruction on (or in) the pipe.
You might have a crack somewhere in the fuel pipe between the tank and the lift pump allowing air in.
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