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Softening the plastic hose by immersing the end in hot (boiling?) water might allow you to stretch it over the connector.
Concentrate first on getting the lift pump to work (disconnected from the injection pump). If that doesn't deliver fuel freely then you have a basic problem.
As I've mentioned, the low-pressure side of the fuel delivery system (from the tank to the lift pump) is simple and should operate freely without obstruction.
From the lift pump to the injection pump (via the filter) there will be more restriction, but it should flow relatively easily. Loosen the connector before the filter and you should be able to pump fuel easily (and without air - unless there is insufficient fuel in the tank of course!) - or a blockage or split in the supply pipe.
Was the fuel pump that you changed the lift pump or the injection pump?
You mention thread tape - is there a chance that there is some blocking the pipe?
Loosen the connection between the filter and the injection pump and you should be able to pump fuel easily. If this isn't possible there may be a blockage in the filter.
It's only when the fuel leaves the injection pump that it is at (very) high pressure.
The injection pump shouldn't pass fuel until it reaches very high pressure (apart from the relief valve which might return the fuel to the tank).
Unless you can supply adequate air-free fuel to the injection pump it stands no chance of working.
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