Combo fuel filter/ pressure regulator won’t fit tight and leaks

[gabsgrammy54]

Trying to install new fuel filter/pressure regulator on 2000 Dodge Neon ES and it won’t fit tight and it leaks. Is there that much variance in sizes that I could have gotten wrong size? Would reinstalling old one to see if it fits and doesn’t leak be a good way to determine that new one is incorrect size?

[Professor_Brap]

Is the Oring on it ripped?

[JeremyJ]

Have you compared the two side by side? I had some slight trouble getting mine to seat properly, but it eventually went in all the way and functions as it should. It's possible you have the wrong part.

[NickKo]

Double-check that the (tiny) little O-ring that goes on the end of the regulator, didn't get stuck up inside the regulator housing bore seat, when you removed the old regulator.
I've seen it happen where that tiny O-ring will come off, remaining stuck inside the regulator seat area.

- Nick