1999 Chevy Silverado

silverado99 · Posted at Mon Mar 24, 2008 8:38 pm

Engine Performance problem
1999 Chevy Silverado V8 Four Wheel Drive Automatic 94,000 miles
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I had a new fuel pump installed. Before changing fuel pumps I was getting about 16 MPG. After the new fuel pump was installed, the gas mileage immediately dropped to about 11 MPG. Any suggestions or recommendations?

dennyp · Posted at Wed Mar 26, 2008 1:11 pm

Check for a leaking fuel pressur regulator.

silverado99 · Posted at Wed Mar 26, 2008 7:50 pm

I had the fuel pressure regulator replaced about a month after the fuel pump was replaced. No change in MPG.

dennyp · Posted at Thu Mar 27, 2008 5:37 am

what is the fuel pressure with the engine running?

silverado99 · Posted at Thu Mar 27, 2008 8:23 pm

No problems with fuel pressure since replacing the regulator. I don't know what the fuel pressure reads or how to check it. But with the old regulator I had problems starting the engine. It would also occasionally die while running. No problems with the new regulator. Gas mileage has not been any better since the new regulator.