# Rich fuel mixture in exhaust pipe please help

**URL:** <https://community.cartalk.com/t/rich-fuel-mixture-in-exhaust-pipe-please-help/7161>\
**Category:** Maintenance/Repairs\
**Created:** [November 11, 2007, 6:14pm UTC](https://community.cartalk.com/t/rich-fuel-mixture-in-exhaust-pipe-please-help/7161 "2007-11-11T18:14:55Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![chuck460](https://avatars.discourse-cdn.com/v4/letter/c/e99b99/32.png) [@chuck460](https://community.cartalk.com/u/chuck460)\
**Post date:** [November 11, 2007, 6:14pm UTC](https://community.cartalk.com/t/rich-fuel-mixture-in-exhaust-pipe-please-help/7161/1 "2007-11-11T18:14:55Z")

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after jumpstarting my coworkers car my 94 ford mustang 3.8 v6 now wont go above 40 miles an hour and has a rich fuel mixture coming out of the tailpipe. i fixed the spark plug wires and new plugs. still the same. please help if you can.

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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:** [November 11, 2007, 9:08pm UTC](https://community.cartalk.com/t/rich-fuel-mixture-in-exhaust-pipe-please-help/7161/2 "2007-11-11T21:08:04Z")

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Check the fuel pressure regulator. If the diaphram in the regulator developes a leak, liquid gas will be pulled into the intake manifold via the vacuum hose.

Tester