Lift pump mechanical or electric?
When it is hard to start have you cracked the lines to the injectors to see what you have there?
My guess would be that when the fuel level gets low the system is loosing prime because gravity is no longer keeping the system full of fuel.
The fact that...
When the fuel level gets low is the pump above or below the fuel?
When it is hard starting can you take a line off your primary filter and see if fuel runs out?
Has it been acting this way a long time? Have you replaced the rubber lines?
When you say the pickup is plenty long...what do...
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