Poor gas mileage

Tiny
RAGU_TD21
  • MEMBER
  • 2002 CHEVROLET AVALANCHE
V8 Four Wheel Drive Automatic

There is no check engine light on. I've changed the fuel pressure regulator. I didn't seem to be leaking but changed it anyways and it still doesn't seem any better on gas. I put injector cleaner in it every oil change 5000km's. Can the return fuel line be plugged? I've talked to the previous owner of the truck and he told me the truck just stalled on the highway and wouldn't start up. He got it towed to the GM garage and they changed the fuel filter and pump. It worked after that.
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Saturday, February 20th, 2010 AT 4:29 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hello,

The MAF sensor can be off a little causing the bad mileage but not enough to trigger a check engine light.

Here is a guide to show you what you are in for when changing the sensor out.

https://www.2carpros.com/articles/how-to-replace-a-mass-air-flow-sensor-maf

Please let us know what happens.

Cheers
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Sunday, July 18th, 2010 AT 11:51 PM
Tiny
CHRIS42772
  • MEMBER
I had this exact same problem once I replaced the sensor the truck never run better, thanks! I love this site.
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Monday, April 16th, 2018 AT 7:12 PM

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