# Fuel Pump 5psi Low

**URL:** <https://community.cartalk.com/t/fuel-pump-5psi-low/77807>\
**Category:** Maintenance/Repairs\
**Created:** [March 5, 2013, 8:48pm UTC](https://community.cartalk.com/t/fuel-pump-5psi-low/77807 "2013-03-05T20:48:43Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![zombi86](https://avatars.discourse-cdn.com/v4/letter/z/48db29/32.png) [@zombi86](https://community.cartalk.com/u/zombi86)\
**Post date:** [March 5, 2013, 8:48pm UTC](https://community.cartalk.com/t/fuel-pump-5psi-low/77807/1 "2013-03-05T20:48:43Z")

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My fuel pump is about 5psi low. Is that enough to justify replacing it. The car likes to buck when accelerating. Had the cat converter tested. It was in good shape. Replace plugs and wires a while back. Regular maintenance. 2002 Monte Carlo SS 100k miles.

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**Author:** ![UncleTurbo](https://avatars.discourse-cdn.com/v4/letter/u/e9a140/32.png) [@UncleTurbo](https://community.cartalk.com/u/UncleTurbo)\
**Post date:** [March 5, 2013, 8:52pm UTC](https://community.cartalk.com/t/fuel-pump-5psi-low/77807/2 "2013-03-05T20:52:27Z")

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where are you measuring the pressure? There is a fuel pressure regulator in there somewhere, so you need to determine if the pressure is low from the pump, or if the regulator is off.

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [March 5, 2013, 9:32pm UTC](https://community.cartalk.com/t/fuel-pump-5psi-low/77807/3 "2013-03-05T21:32:25Z")

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Yes. If the reading is 5 PSI below spec the fuel pump requires replacement.

Tester

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**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\
**Post date:** [March 5, 2013, 9:57pm UTC](https://community.cartalk.com/t/fuel-pump-5psi-low/77807/4 "2013-03-05T21:57:02Z")

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Is there a spec & test for pump volume (gal per minute)?  
This would help to judge whether it’s the pump or regulator.

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**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\
**Post date:** [March 5, 2013, 10:45pm UTC](https://community.cartalk.com/t/fuel-pump-5psi-low/77807/5 "2013-03-05T22:45:25Z")

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I’d test the regulator first. Maintaining pressure is it’s only job.