1999 Chevy Silverado

SILVERADO99

MEMBER
1999 CHEVROLET SILVERADO
V8
4WD
AUTOMATIC
94,000 MILES

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?

Monday, March 24th, 2008 AT 11:38 PM

4 Replies

DENNYP

MECHANIC
1,823 POSTS

Check for a leaking fuel pressur regulator.

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Wednesday, March 26th, 2008 AT 4:11 PM

SILVERADO99

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4 POSTS

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

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Wednesday, March 26th, 2008 AT 10:50 PM

DENNYP

MECHANIC
1,823 POSTS

What is the fuel pressure with the engine running?

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Thursday, March 27th, 2008 AT 8:37 AM

SILVERADO99

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4 POSTS

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.

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Thursday, March 27th, 2008 AT 11:23 PM