Jaguar Repair: No fuel to pump, permanent magnet, fuel pumps

Question
Hi Howard,

 Catherine here again working on the 1984.  After circut test you taught me before discovered it had a bad fuel pump.  Bought a new one and nothing.  Still has power.  Can run pumpwith a jump to socket but fuel does not come.  Ordered a new pump.  Same thing.  Checked pump after it runs and there is no fuel in it.  Tank is full and I pulled the fuel hose right at the tank spout in trunk and fuel came pouring in.  So no clogs thus far.  This car had run last year.  Not well but it did get fuel.
  I bought a delco fuel pump. After market type.  
So is there anything else to stop the pump from drawing the fuel ?  Any thing else to check? or do I just need a better fuel pump.  I never used this brand before.  It had the same flat connecting pins as my broke lucas.

 Thank you

Answer
If you have fuel available at the line going into the pump and it runs but does not take any fuel into the pump itself you either have the lines connected backwards or the wires backwards. Most fuel pumps are permanent magnet fields meaning if you reverse the wires, it will run backwards.

Just test run the pump off the car and put your finger over the inlet and you should feel suction on your finger and then put your finger over the out let and you should feel pressure.

The pump has to be an injection pump that can pump fuel up front and have a 40+ Psi to the regulator.