hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
50,187 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2003 GMC Sierra 1500 fuel system problems

fuel system problem

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2003 GMC Sierra 1500 Owner Comments

problem #5

Dec 112014

Sierra 1500

  • 44,300 miles


While having my vehicle check over for the winter, the mechanic inform me that the front brake lines are very rusty as well as the fuel lines and the cooling lines going to the transmission. This situation is very disturbing since I have very low mileage. The tubing used for the brake as well as the fuel lines should be able to withstand rusting for the life of the vehicle. If the material used by GM was not up to specification as far as corrosion protection either compensation to repair it is in order a recall should be made.

- Oswego, IL, USA

problem #4

Jun 092011

Sierra 1500

  • miles
My 2003 GMC Sierra 1500 sle has corroded brake, transmission and fuel lines. A certified mechanic stated that they all need replaced or breakage and leakage will occur without warning causing break, transmission or fuel delivery or fire damages. Please help with this problem asap. 00.

- Huber Heights, OH, USA

problem #3

Oct 192011

Sierra 1500 6-cyl

  • 29,000 miles
Check engine light investigated, and cause found to be loss of fuel tank pressure due to rotted out fuel filler neck. Original part made of non-corrosion resistant steel. Other corrosion problems with this vehicle have involved brake lines. The first line was replaced in 2007, when the vehicle was only 4 years old. A more extensive replacement of corroded lines was done in 2008 or 2009. These are serious safety and emissions related problems, and these vehicles should be recalled as a result of them. Owners who have paid for repairs in the past should be compensated by a reasonable amount.

- Gloversville, NY, USA

problem #2

Jul 212011

Sierra 1500

  • 77,636 miles
A brake line burst underneath the truck when I applied the brakes with substantial pressure (not enough to engage ABS on the dry pavement). Was able to swerve to avoid vehicle that cut us off and use emergency brake to slow/stop vehicle in a safe place. All brake lines were severely rusted/corroded and needed to be replaced. Fuel lines were replaced as well at the same time, due to severe corrosion.

- Brookline, NH, USA

problem #1

Sep 012010

Sierra 1500

  • 100,000 miles
Fuel line corrosion resulting in multiple leaks in pressurized fuel line. Fuel dripped continuously onto the transmission, including some electrical connections, as well as onto the exhaust system, clearly representing a fire hazard. When problem first started, gasoline vapor was noticeable in the cabin. 2003 GMC Sierra 2wd ext cab fuel line assembly was replace by local mechanic ~$640 parts and labor.

- Grosse Pointe Woods, MI, USA

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