# Is my fuel regulator any good?

**URL:** <https://community.cartalk.com/t/is-my-fuel-regulator-any-good/53261>\
**Category:** Power/Fuel\
**Tags:** j30, infiniti, gasoline\
**Created:** [August 9, 2010, 8:37pm UTC](https://community.cartalk.com/t/is-my-fuel-regulator-any-good/53261 "2010-08-09T20:37:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![mjgrosso93](https://avatars.discourse-cdn.com/v4/letter/m/41988e/32.png) [@mjgrosso93](https://community.cartalk.com/u/mjgrosso93)\
**Post date:** [August 9, 2010, 8:37pm UTC](https://community.cartalk.com/t/is-my-fuel-regulator-any-good/53261/1 "2010-08-09T20:37:51Z")

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I have a 93 Infiniti J30 and I was wondering if my fuel regulator is good. It has a small opening for vacuum which I can’t suck or blow through. It has two openings for fuel, top and bottom. I can blow through the top one and it comes out the bottom, but its better when I blow through the bottom and it comes out the top. In your opinion is this ok? I’m not sure. I’m replacing my filter and was wondering if I should replace this as well.

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**Author:** ![ok4450](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@ok4450](https://community.cartalk.com/u/ok4450)\
**Post date:** [August 10, 2010, 12:02am UTC](https://community.cartalk.com/t/is-my-fuel-regulator-any-good/53261/2 "2010-08-10T00:02:29Z")

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A fuel pressure regulator can only fail in a couple of ways. One is leakage through the diaphragm. If it holds a vacuum then the diaphragm is good. The other would be if it’s sticking and this would require a fuel pressure gauge to verify as the fuel pressure will change a little depending on manifold vacuum.

It’s unlikely that either of these things would cause a no-start condition.