Hi,
The fuel pump should have lifted first once you removed the retainer. Then the o-ring is between the pump and the tank. Is that how you have it installed or did you place the pump in the tank, the O-ring on top of the pump, and then the retainer? Also, there are notches on the lock ring. Make sure all seven notches of the lock ring have engaged.
Next, I attached the directions for the auxiliary fuel pump module installation. It indicated the o-ring must be replaced. I've never had a problem with one that was in good condition, but maybe that is the case with yours; it's damaged and not visible.
Take a look at the directions below. Make sure everything is clean and confirm the quick connector isn't the source of the leak.
Let me know what you find.
Joe
See pics below.
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Tuesday, November 14th, 2023 AT 2:02 PM