Asked by Mar 24, 2014 at 01:43 PM about the 2003 GMC Sonoma SL Ext Cab 2WD

Question type: Maintenance & Repair

I have a 2003 GMC Sonoma 4CYL 2.2L with 140K miles.  It has had a recurring issue where it is hard to start when the fuel gauge reads 1/4 tank or less.  Usually have to knock on the fuel tank to get it to turnover.  Recently replaced fuel filter, still the same.  I thought that is usually indicitive of a faulty pump that is seizing.  Additionally, I am continually battling a P0171 code in the computer.  Is this all related to the same issue, or do I have multiple issues (fuel pump, 02 sensor, etc)?

2 Answers


Ok, so you said the gas gauge is off and you have to bang on the fuel tank to get it started, so you replaced just the fuel filter. You need to replace the fuel pump assembly to replace the pump itself and the fuel level sensor should be part of the assembly. P0171 is usually a lean condition, look for a vacuum leak..http://www.obd-codes.com/p0171

1 of 1 people found this helpful.

Thanks, Tom. Gas gausge isn't off, it works fine - shows full when full, etc. But when I get to 1/4 tank, is when I have trouble starting. I know of the service bulletin regarding gauge misread (1/4 tank actually = empty) but I don't think that is the issue. I never stall when driving, just have a hard time starting - also not sure why banging on the fuel tank seems to work - can you explain? I've heard of that working for a siezed pump, but never heard of a "faulty" pump (i.e. low pressure), I thought they either worked or didn't work. Will check for leak for error code. Was hoping they would be the same issue though. :-)

Your Answer

Add photo

Related Questions

  • fuel 2 answers

    Hesitation,bog out 2-3 times a month replace fuel filter,pump 2010, whats your take??

    1999 GMC Sonoma 2 Dr SLE 4WD Extended Cab SB


    Maintenance & Repair

  • Fuel pumps 1 answer

    1995chevy Silverado 1500 fuel pump interchange with 2003 GMC somoma fuel pump

    2003 GMC Sonoma SL 2WD


    Maintenance & Repair

  • no power to fuel pump 6 answers

    were is the fuel pump fuse

    2000 GMC Sonoma SLS Ext Cab Short Bed 2WD


    Maintenance & Repair

  • fuel pump 2 answers

    I have a 95 gmc sonoma change the fuel and relays and the pump still not pushing gas out the tank threw the lines but its coming on. Dont understand this one do i need to change the pump housing t...

    1995 GMC Sonoma 2 Dr SLS Standard Cab LB


    Maintenance & Repair

  • 2006 gmc sle engine lite on. Changed intake gaskets o2sensor wires plugs sensor at the pipe going to the breather box. I forgot the name. 1 answer

    Truck idles rough p0171 p0174 lean on both banks. It is need to know what will fix it. I had what if to the point is collaring me to death.

    2006 GMC Sierra 1500HD SLE1 4dr Crew Cab 4WD SB


    Maintenance & Repair

Search GMC Sonoma Questions

GMC Sonoma Experts

#1 parkle
Reputation 670
#2 Mike Bonnell
Mike Bonnell
Reputation 460
#3 James Mayfield
James Mayfield
Reputation 320
View All

Related Models For Sale

Used Chevrolet S-10
10 Great Deals out of 1,345 listings starting at $1,395
Used Ford Ranger
196 Great Deals out of 5,805 listings starting at $1,650
Used Chevrolet Colorado
217 Great Deals out of 24,313 listings starting at $2,495
Used GMC Canyon
92 Great Deals out of 9,387 listings starting at $2,495
Used GMC Sierra 1500
824 Great Deals out of 68,200 listings starting at $2,484
Used Chevrolet Silverado 1500
1,716 Great Deals out of 175,753 listings starting at $1,250
Used Ford F-150
2,198 Great Deals out of 206,316 listings starting at $1,499
Used Toyota Tacoma
544 Great Deals out of 40,814 listings starting at $2,495
Used Dodge Dakota
106 Great Deals out of 3,781 listings starting at $1,680
Used Nissan Frontier
305 Great Deals out of 25,149 listings starting at $1,995
Used Dodge Ram 1500
455 Great Deals out of 11,151 listings starting at $700
Used Chevrolet Camaro
226 Great Deals out of 30,943 listings starting at $1,217
Used Ford Explorer Sport Trac
62 Great Deals out of 1,824 listings starting at $1,800
Used Honda Civic
656 Great Deals out of 88,604 listings starting at $995

Used Cars For Sale

2003 GMC Sonoma SL Ext Cab 2WD For Sale
13 listings starting at $2,999

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.