1999 GMC Sierra Fuel delivery problem?

1999 GMC SIERRA
250,000 MILES • 6 CYL • 2WD • AUTOMATIC
Avatar
BRUCEVOS
  • MEMBER
  • 1 POST
The engine runs rough at low rpm say up to around 2000. Then it smooths out somewhat. The fuel pump makes a higher pitched whine than the usual sound. This problem started off less noticeable and intermittent and without me noticing the fuel pump noise. What should I do to fix this problem?
Apr 17, 2008 at 4:23 PM
Advertisement
Avatar
SERVICE WRITER
  • ✓Experienced Mechanic
  • 9,123 POSTS
I would check for codes to start to see if there are any clues there. IF none, I would check fuel pressure to monitor what it does as the problems are happening to see if it is falling out of spec. The were fuel pump connector issues on that era of GM trucks, but I think at your mileage, this would have been addressed.
Apr 17, 2008 at 10:07 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle