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If you have an early stle tank the pickup is welded in and the only way to remove it is to remove the tank and have a weldind shop cut it out and reweld. If it is a later style the pickup is integral with the fuel sending unit and after you remove the quarter window you just remove the 6 cap screws and wiggle the assembly up and out of the tank.
Good luck.
I had to do the fuel sender/pickup on 3859 several years ago; here is how I did it.
1. Remove the quarter window as outlined by the previous post.
2. Remove the nuts that retain the sender/pick-up to the tank (remove the gas line as well).
3. Carefully begin lifting the sender/pick-up unit out of the tank opening and lift toward the window opening; the unit has a pivoiting arm with a float on the end that is positioned toward the rear of the tank so as you are lifting it out toward the window opening carefully snake the unit toward the rear as well.
I hope this helps your effort, it is quite easy once you get the window out, I did not repair my unit (it was not damaged or worn-out) I replaced with new unit (Hall Pantera orginal type from Detomaso).
The confusion on this topic comes from the fact that '71-late '72 cars have a welded fuel pickup integral to the tank while '73-up cars use a pickup integral to the fuel sender, which is removeable per the mentioned methods.
So, if you have an early tank, the pickup is utterly un-service-able without removal of the tank and major surgery. But a later fuel pickup is perfectly interchangeable with both tanks, requires no tank removal nor welding and then allows the presumably defective integral fuel pipe to function as a fuel injection return. For this, little is necessary beyond a non-leaking banjo fitting on top. The late fuel gauge sender/pickup unit is quite expensive, but I wrote an article in the Winter '99 issue of the PI magazine on converting an early fuel sender to have a late type home-made fuel pickup. Back issues of the magazine are available from P.I.
To my knowlege, there is NO substitute fuel gauge sender that works accurately with the stock Pantera gauge. The electrical parameters and appearance of a '70-74 Alfa fuel gauge sender is very similar and is available more reasonably that a genuine DeTomaso part, but no guarantees as to whether it will be accurate. Plus, it has no low-fuel warning circuit. I have not tested this in a tank, either.
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