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The only squared thing on the pump is the "plastic"
fluid tank... Everything else about the design & function
is "circular".
There is ABSOLUTELY circular "MOTION" inside the PUMP...
PLEASE NOTE... there is a giant pulley on the front..
and the design of the pump is all about rotational force of the hydraulic pump (right THROUGH the middle).
High pressure to the high pressure...
(with a possible cooler option in the middle)
Low pressure back to the reservoir
How do you know there isn't enough electrical power? Low pressure might indicate a bad or weakening fuel pump or bad fuel pressure regulator or possibly clogged fuel injectors. If the fuel pump is getting the 12V via relay/ignition switch then it's not an electrical problem, but a fuel delivery problem probably caused by the things mentioned above.
There is a very good reason why you cannot find it. 2001 Pontiac Aztek is not equipped with a "reset switch" for the fuel pump.
If your fuel pump is not working, you need to diagnose your fuel pump circuits in accordance with the procedures in the shop manual.
This includes using a scan tool that can access the computer not only to retrieve fault codes, but also to command the fuel pump relay on and off so the relay circuits can be checked.
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