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Rough idle after replacing fuel pump

Tiny
DARREN BURREN
  • MEMBER
  • 2002 SAAB 9-3
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Hi, I have replaced the fuel pump on my vehicle listed above. The pump works fine but now as soon as it warms up, it's idling rough to the point of stall. Drives fine but just idles rough.
Sunday, August 9th, 2020 AT 7:24 AM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
I assume it was running poorly at all before the pump replacement? If not, we need to check the pump operation when it warms up. It may be a faulty new pump.

Here is a guide that will help with that. Let's check the pressure when this is acting up and see what it does.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Also, is there any history with this? Did the vehicle sit for a long time before you put the pump in it? Or was it running fine, then it had the issue with the pump and now it is doing this?
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Sunday, August 9th, 2020 AT 7:36 AM

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