Question about 2001 GMC Sonoma Extended Cab

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POOR GAS MILEAGE

2001 sonoma pickup, poor gas mileage, suppose to get 22 to 28 miles per gallon, getting 17.5 (mostly freeway), also hard to start. Humming noise like fuel pump is going out.

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Have you changed the fuel filter? I know it sounds weird but a plugged filter will make a truck use more gas. The computer tries to compensate for less fuel by commanding the injectors to open longer. Also a plugged filter will cause excess back pressure on the fuel pump making it loud.. Good Luck.

Posted on May 29, 2009

  • rella_fan Feb 19, 2011

    mechanicm639 OMG, my sonoma 99 vortex 4.3 v-6 ive had it for two years. Ive always thought the fuel punp on my truck was wayyyyyy to LOUD! I bet this is the answer. Pi$$ pour mileage as well, just filled it, down to less than 50% full and only 50 miles on that useage! You are the man! Thanks!

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Not sure what engine you have as to options, etc?

How you drive will greatly change that number up or down depending on a number of driving and driver variables.

A few being -

Driving habits?

Tire pressures?

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How many people in the SUV on average?

Are you towing anything?

Type gas you are burning - BRAND? (See injectors below)

Area you are driving in (hills and valleys verses flat out,
etc)

Jeeps in general don't have a good track record for great mileage, and rough engine idling is always a clue that your fuel injectors are dirty. Typical on all Jeeps with port fuel injection systems! On Jeeps with dirty fuel injectors your mileage will go way down accordingly. If your not putting at least a 12 oz bottle of say Walmart brand Super Tech Fuel Injector Cleaner (~ $1 each) in your gas tank religiously every logged 1000 miles, or every 2 tank fill ups, then you are just inviting dirty fuel injectors and POOR fuel economy!

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Hope that helps ease your mind about gas mileage as it relates to your Jeep there.

Frank


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