A failing fuel pump in a 2008 GMC Sierra doesn’t announce itself with a grand breakdown. It whispers first — a long crank when the engine is hot, a sudden lack of power climbing a grade with a trailer, or a fuel gauge that starts dancing erratically. Ignore those signals and the silence comes on the shoulder of a highway with 8,000 pounds of payload behind you. Choosing the right replacement means understanding the specific fuel system architecture of the GMT900 platform, where a drop below the required 58 PSI at the rail means injectors starve and the 6.0L or 4.3L stumbles.
I’m Amir — the founder and writer behind Four Wheel Ask. I’ve spent years analyzing automotive fuel delivery systems, cross-referencing OEM service bulletins, and aggregating long-term owner data from full-size truck forums to identify which aftermarket modules actually hold pressure and which fail within a season.
This guide breaks down the best 2008 GMC Sierra fuel pump options based on real-world pressure retention, sending unit accuracy, and installation compatibility with your specific cab and bed configuration.
How To Choose The Best 2008 GMC Sierra Fuel Pump
Selecting a fuel pump for this generation of full-size truck is not a one-size-fits-all decision. The 2008 Sierra spans multiple platforms — the 4.3L V6, 6.0L V8, and 6.6L Duramax diesel — each requiring a different module assembly with specific pressure ratings and sending unit interfaces.
Match the Module to Your Engine and Bed Length
The 2008 GMT900 trucks use a saddle-style fuel tank mounted under the driver-side frame rail. The 97.6-inch standard bed uses a different module than the 133-inch or 157.5-inch long bed configurations. Always verify the wheelbase and bed length against the manufacturer fitment chart. Gasoline and diesel modules are not interchangeable — the diesel module operates at a higher pressure range and uses a threaded outlet instead of a hose barb.
Prioritize Sending Unit Longevity
The most common failure on original modules is not the pump itself but the fuel level sending unit. The resistive strip on the sender corrodes over time, causing the gauge to peg empty or bounce randomly. Many aftermarket modules use a standard 0-90 ohm sender that matches GM calibration, but the quality of the resistive track varies widely. Modules with stainless steel or coated sender contacts consistently outlast bare brass designs in ethanol-blended fuels.
Check the Lock Ring and Seal Kit
The locking ring that secures the module to the fuel tank often corrodes, especially in salt-belt trucks. Some replacement modules include a new seal ring and lock ring; others do not. If the box does not contain these parts, you will need to order them separately or reuse the originals — risking a fuel leak or a fuel odor inside the cabin.
Quick Comparison
On smaller screens, swipe sideways to see the full table.
| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| BOSCH 69967 | OE Replacement | Silverado/Sierra 1500 gasoline | 58-62 PSI turbine pump | Amazon |
| ACDelco MU1748 | GM OE | OE-spec full-size SUV/truck | Plastic body, 0-90 ohm sender | Amazon |
| Delphi FG1057 | Premium Aftermarket | Heavy-duty towing applications | Metal body, 5 lb assembly weight | Amazon |
| ACDelco MU1613 | GM OE | Direct gas-engine replacement | Metal body, harness included | Amazon |
| Dorman 2630311 | Aftermarket | Budget build with pigtail kit | Alloy steel, 4 butt connectors | Amazon |
| Delphi FG0407 | OE Heritage | Long-haul reliability seekers | Metal body, 3 lb module weight | Amazon |
| Detroit Axle FSP6030M | Budget Aftermarket | Entry-level replacement | 30 lb shipping weight, 10-year warranty | Amazon |
| A-Premium FP0090C | Budget Gas | Short-term fix for 4.3L/6.0L | Aluminum body, 1.73 kg weight | Amazon |
| A-Premium APFP0699AM | Budget Diesel | Duramax 6.6L fuel module | Stainless steel sender, threaded outlet | Amazon |
In‑Depth Reviews
1. BOSCH 69967 Original Equipment Fuel Pump Module Assembly
Bosch is the OE fuel pump supplier for General Motors, and the 69967 module is the same unit that rolled off the assembly line in the 2007-2008 GMT900 trucks. The patented turbine pump design eliminates fuel pulsation and virtually removes the whining noise that cheap replacement pumps introduce into the cabin. One owner reported that a previous budget pump delivered only 14-18 PSI of rail pressure, causing hard starts and misfires; swapping to the Bosch instantly brought pressure above 60 PSI and restored normal behavior.
This assembly is specific to the 1500 series gasoline engines with the 97.6-inch standard bed. The included fuel strainer and OE-style harness connector make installation straightforward for the DIY mechanic pulling the bed or dropping the tank. The module uses a barbed outlet and fits the 4.3L and 6.0L configurations without any adapter modifications.
While the price places this firmly in the premium tier, the long-term value is undeniable. Multiple owners confirm this pump outlives two or three budget replacements.
What works
- OE turbine pump design delivers consistent 58-62 PSI at the rail
- Virtually silent operation compared to budget alternatives
- Includes fuel strainer and full installation instructions
What doesn’t
- Fits only 1500 series with standard bed; confirmed fitment required for trims
- Open-box units have been reported, verify seal integrity on delivery
2. ACDelco MU1748 GM Original Equipment Fuel Pump and Level Sensor Module
The ACDelco MU1748 is the GM Genuine Parts service replacement for the 2008 Sierra and Suburban models equipped with gasoline engines. Unlike some aftermarket modules that use a plastic composite housing, this unit features a reinforced thermoplastic body that resists warping from ethanol-blended fuels. The 0-90 ohm sending unit is calibrated to match the factory instrument cluster, eliminating the erratic gauge behavior common with non-OE senders.
One benefit of the plastic body design is reduced weight — roughly 2.67 pounds versus 3 to 5 pounds for metal-bodied modules — which makes handling the assembly during installation less fatiguing when working under the truck or inside the frame rail. The unit ships with a new seal ring and harness connector, though the lock ring must be reused or ordered separately if corroded.
The limited lifetime warranty covers parts sold after April 2018, which adds long-term peace of mind. Owners report that this module restores consistent fuel delivery and accurate gauge readings on trucks with over 200,000 miles. For those who want the exact factory part without paying dealer markup, the MU1748 is the straightforward answer.
What works
- OE-spec sender eliminates gauge bounce and inaccurate readings
- Lightweight plastic body resists ethanol corrosion
- Limited lifetime warranty from a major OEM brand
What doesn’t
- Lock ring not included; must reuse or purchase separately
- Plastic housing less impact-resistant than metal alternatives
3. Delphi FG1057 Fuel Module
The Delphi FG1057 stands out for its all-metal construction and limited lifetime warranty. This module is designed for the 1500 series 2008 Sierra, but its rugged build makes it a favorite among owners who frequently tow or haul heavy loads. The metal housing provides superior heat dissipation compared to plastic modules, which helps maintain consistent fuel temperature and reduces vapor lock risk during extended high-load operation.
At 5 pounds, the FG1057 is the heaviest module in this lineup, but that mass reflects the use of thicker gauge materials and a larger internal pump assembly. Owners report that this unit looks and feels more robust than the original GM part. The wiring harness uses a NPT-style connector instead of the simpler barbed connector, which provides a more secure electrical seal against moisture intrusion in the tank environment.
Installation requires some care because the metal body does not flex like plastic modules — the float arm and sender must be aligned exactly to avoid binding against the tank walls. The limited lifetime warranty on this Delphi product is transferable, adding resale value if you ever sell the truck.
What works
- All-metal housing provides excellent heat dissipation for towing
- Limited lifetime warranty, transferable to future owners
- NPT-style electrical connector resists moisture and corrosion
What doesn’t
- Heavier and harder to maneuver during installation
- Metal body requires precise alignment to avoid binding the float
4. ACDelco MU1613 GM Original Equipment Fuel Pump and Level Sensor Module
The ACDelco MU1613 is the direct GM OE replacement for the 2008 Sierra with the 4.3L and 6.0L gasoline engines, and it includes the full harness, seal, and float assembly. This module uses a metal housing similar to the original factory part, which some owners prefer over the later plastic designs because of its impact resistance and structural rigidity.
One owner reported that the original factory pump lasted 130,000 miles, and the replacement ACDelco maintained the same fuel pressure and quiet operation. The module ships with a new wiring harness and seal ring, which simplifies the job significantly — no need to splice wires or reuse old seals that may have compressed and lost their sealing ability over time.
The sending unit on this module has been updated with a coated resistive track that resists ethanol corrosion better than the original design. A minority of owners have noted that the sending unit on the replacement only lasted 30,000 miles before developing a dead spot, but this varies by fuel blend and storage conditions. For pure OE fitment with all necessary subcomponents included, the MU1613 is a strong contender.
What works
- Includes full harness, seal, and float for complete replacement
- Metal housing resists warping and impact damage
- Coated sender track improves ethanol resistance
What doesn’t
- Sending unit longevity inconsistent across fuel blends
- No lock ring included in the package
5. Dorman 2630311 Fuel Pump Module Assembly
Dorman has built a reputation for engineering replacement parts that address common failure points of the original design, and the 2630311 module is no exception. This assembly is constructed from alloy steel with a durable finish that resists corrosion in the harsh environment inside the fuel tank. It is designed to fit a range of GM trucks and SUVs from the early 2000s, including the 2008 Sierra with the appropriate bed configuration.
The standout feature is the included electrical connector pigtail harness with four butt connectors and heat shrink tubing. This eliminates the need to cut and splice the vehicle’s wiring harness — a headache on GMT900 trucks where the original connector often becomes brittle and cracked from age. Dorman includes comprehensive fitment notes in the product listing, requiring verification of bed length and wheelbase before purchase.
Some owners have reported a long crank condition during hot ambient temperatures, suggesting the internal check valve may allow fuel to bleed back to the tank. This is not universal, but it is a known pattern. For a mid-range price point that includes the pigtail kit, the Dorman offers a compelling balance of cost and features for the DIY installer who wants a complete package.
What works
- Includes pigtail harness with heat shrink for no-splice installation
- Alloy steel construction resists tank corrosion
- Fitment verification tool helps avoid wrong-part returns
What doesn’t
- Check valve may cause long crank in hot weather
- No lock ring or seal ring included in the package
6. Delphi FG0407 Fuel Pump Module
Delphi brings over 80 years of OE heritage to the FG0407 module, which is validated and tested to match the exact application of the 2008 Sierra. The metal body construction and rigorous extreme-temperature testing make this a durable choice for owners who keep their trucks for the long term. One owner reported the previous Delphi pump lasted over 200,000 miles before requiring replacement, which speaks to the consistency of the internal pump and sender quality.
The FG0407 uses a barbed hose connection and a metal body that matches the original GM form factor. The unit is pre-assembled with the float and level sensor, and the wiring harness uses a standard GM connector that plugs directly into the truck’s chassis harness — no pigtail splicing required. This plug-and-play aspect reduces installation time significantly.
The main trade-off is the price point, which sits in the mid-to-upper range of aftermarket options. A small number of owners have reported sending unit failure within the first few months, though this appears to be an intermittent quality control issue rather than a design flaw. For most buyers, the Delphi FG0407 delivers the same reliability as the OEM with a lower price tag than dealer parts.
What works
- Plug-and-play connector requires no wiring modification
- OE heritage with extreme-temperature validation testing
- Long service life reported by owners exceeding 200,000 miles
What doesn’t
- Intermittent quality issues with sending unit accuracy
- No lock ring included with the assembly
7. Detroit Axle FSP6030M Fuel Pump Module Assembly
Detroit Axle offers a 10-year warranty on the FSP6030M module, which is one of the longest coverage periods in the budget-to-mid-range segment. The module is designed for the 2007-2008 Silverado and Sierra 1500/2500HD/3500HD with the 6.0L engine and 97.6-inch standard bed. The kit includes the pump module assembly only — no seal ring, lock ring, or wiring harness — so careful inspection of existing components is required before installation.
The module undergoes impact, wear, and fatigue testing that mimics the stress of daily driving and towing. The pump itself runs slightly louder than OEM units, which some owners notice as a faint whine from the driver seat, but it maintains consistent fuel delivery under load. The float arm uses a standard sender that provides accurate gauge readings when properly indexed to the tank.
The 30-pound shipping weight is unusually high for a component that weighs far less, indicating robust packaging and possible inclusion of installation aids. The warranty covers the part only and does not cover labor or towing costs. For owners on a strict budget who want the security of a long warranty, the Detroit Axle is worth considering.
What works
- 10-year warranty provides long-term coverage
- Impact and wear testing ensures durability under load
- Direct fit for 97.6-inch standard bed configurations
What doesn’t
- Audible pump whine compared to silent OE units
- No seal ring, lock ring, or wiring harness included
8. A-Premium Electric Fuel Pump Module Assembly FP0090C
The A-Premium FP0090C is a budget-friendly option that fits the 2008 Sierra with the 4.3L and 6.0L gasoline engines in standard bed configuration. The module includes the fuel pump, sending unit, strainer, seal ring, and pressure sensor in one box — one of the few sub-premium options to include the seal ring. The aluminum body construction is lighter than all-steel modules and resists corrosion from ethanol and water contamination.
Owner feedback is mixed but leans positive for the price. The majority report that the pump restores normal idle quality and eliminates long cranking, suggesting that the check valve holds pressure adequately. However, there are isolated reports of hard starts developing after installation, which could indicate internal leakage or insufficient prime pressure. The one-year unlimited-mileage warranty covers the part cost only, not labor or related repairs.
This module is best suited for owners who need a quick replacement to get the truck back on the road while they budget for a higher-tier unit later. It works reliably in most cases, but the quality variance is wider than premium brands. For a temporary solution or a low-mileage daily driver, the A-Premium offers the lowest entry price with a complete parts package.
What works
- Includes seal ring, strainer, and pressure sensor in the box
- Aluminum body resists ethanol corrosion
- One-year warranty covers part replacement
What doesn’t
- Inconsistent quality control; some units develop internal leakage
- Hard start conditions reported by a subset of owners
9. A-Premium Electric Fuel Pump Module Assembly APFP0699AM
The A-Premium APFP0699AM is specifically designed for the 6.6L Duramax diesel engine in the 2008 Sierra 2500HD and 3500HD. Unlike gasoline modules that use a hose barb outlet and operate at lower pressure, this diesel module uses a threaded outlet connection to handle the higher fuel pressure demands of the Duramax CP3 injection system. The sending unit features stainless steel contacts, which resist the corrosive effects of diesel fuel with high sulfur content or biodiesel blends.
One owner with a 2008 Duramax reported that the factory sender had rusted and leaked after 17 years, and this module restored both fuel delivery and gauge accuracy. Another owner noted that the module was still functioning perfectly after a year, despite initial skepticism about the low price point. The module includes the fuel pump, seal ring, sending unit, and strainer — a complete kit for the die sel platform.
The main risk is fitment validation for the 6.6L application. The product listing specifies 2004-2008 2500HD and 2007-2008 3500HD, but one verified owner reported that the module did not fit their 2004 Sierra 2500HD, suggesting that the locking ring or module depth may vary between early and late GMT800/GMT900 trucks. Careful measurement of the original module depth is advised before committing to installation.
What works
- Threaded outlet handles Duramax fuel pressure requirements
- Stainless steel sender contacts resist diesel corrosion
- Complete kit with seal ring and strainer included
What doesn’t
- Fitment varies by year; 2004 models may not match depth
- Limited return window on Amazon for late-detected fitment issues
Hardware & Specs Guide
Fuel Pressure Requirements
The 2008 GMT900 trucks require a minimum of 58 PSI at the fuel rail for proper injector operation on the 4.3L and 6.0L gasoline engines. The Duramax diesel operates at a significantly higher pressure range and uses a different module architecture. When a pump drops below 55 PSI under load, the engine will exhibit hesitation, reduced power, and may set lean condition codes. The internal check valve in the module must also hold enough residual pressure—typically above 30 PSI overnight—to prevent extended hot-start cranking. Modules with a turbine pump design, such as the Bosch 69967, maintain this threshold more consistently than budget options with older vane-style pumps.
Sending Unit Resistance Range
GM uses a 0-90 ohm resistive range for fuel level senders on this generation of trucks. A reading of 90 ohms indicates an empty tank, and near 0 ohms indicates a full tank. The quality of the resistive track and wiper contact determines long-term accuracy. Corrosion on the track causes the gauge to drop to empty at random or peg full. Modules with stainless steel or conformal-coated tracks, such as those found on the ACDelco and Delphi kits, resist the corrosive effects of ethanol much better than bare brass tracks. The float arm must also be indexed correctly to the tank depth — an arm set too high will peg the gauge at full and cause the low-fuel light to illuminate prematurely.
FAQ
Can I use a gasoline fuel pump on my 2008 GMC Sierra Duramax diesel?
What does a dying fuel pump sound like on a 2008 GMC Sierra?
Do I need to drop the tank or remove the bed to replace the fuel pump?
How do I know if my Sierra fuel pump module includes the correct sending unit for my gauge?
Final Thoughts: The Verdict
For most buyers, the 2008 gmc sierra fuel pump winner is the BOSCH 69967 because it is the OE supplier unit that delivers consistent 58-62 PSI pressure, silent turbine operation, and a proven track record in the GMT900 platform. If you want a complete OE package with the sending unit and harness included, grab the ACDelco MU1748. And for Duramax diesel owners who need a threaded outlet module with a stainless steel sender, the A-Premium APFP0699AM delivers reliable fuel delivery at a budget-friendly entry point.
Certification: BSc in Mechanical Engineering
Education: Mechanical engineer
Lives In: 539 W Commerce St, Dallas, TX 75208, USA
Md Amir is an auto mechanic student and writer with over half a decade of experience in the automotive field. He has worked with top automotive brands such as Lexus, Quantum, and also owns two automotive blogs autocarneed.com and taxiwiz.com.