SYKRSS E3581M Electric Fuel Pump Module Assembly (Replaces MU1639, 19256621) for 2004-2007 Tahoe/Yukon/Escalade V8

If your fuel pump module is acting up, you usually notice it through performance issues—rough starts, hesitation under load, or fuel delivery that just doesn’t feel stable. The SYKRSS E3581M Electric Fuel Pump Module Assembly is designed for specific GM/SUV applications in the 2004-2007 range, aiming to restore consistent fuel pressure and flow.

This isn’t a “fit it to everything” part, and that’s actually a good thing: it’s built around known OE-style reference numbers. The catch is that compatibility depends on the exact vehicle and engine setup, so you’ll want to double-check fitment before you buy.

The essentials

The E3581M is an electric fuel pump module assembly made to replace multiple reference numbers (including MU1639 and 19256621, plus others listed by the manufacturer). In plain terms, it’s intended to bring back the fuel system function that keeps the engine supplied with fuel for normal driving and injector operation.

On paper, SYKRSS positions it as a part engineered to meet or exceed OE specifications in quality, fit, and function. It’s also described as using all-new materials and being manufactured under quality-controlled processes intended to support quieter operation and longer durability.

From a buyer’s standpoint, the important part is the intent: not just moving fuel, but maintaining fuel pressure and flow efficiently so the engine can get a constant supply.

Key features that matter for driving

The listing emphasizes two areas that directly affect day-to-day feel: fuel delivery stability and efficiency.

First, the module is described as offering optimal fuel pressure and flow. That matters because fuel pressure stability is tied to how smoothly the engine starts and runs, especially when demand changes (acceleration, climbing grades, or higher electrical loads).

Second, it’s positioned as helping maximize fuel efficiency and performance by improving fuel consumption and power output. It’s not magic, and results can vary by overall vehicle condition, but having the correct fuel module is a key foundation for consistent engine behavior.

What’s included in the “module” concept

A fuel pump module assembly generally means more than just the pump itself—it’s the integrated piece that supports proper fuel delivery as a system. In this SYKRSS version, the focus is on restoring continuous fuel flow to the injector and keeping fuel delivery consistent.

If you’ve ever dealt with an older module that starts to degrade, you’ll know how annoying it is when the problem shows up intermittently. A replacement like this is meant to remove that uncertainty and get back to predictable fuel system performance.

Fitment: where to be careful before buying

The product description lists compatibility for: - Chevrolet Tahoe 2004-2007 V8 4.8L or 5.3L (Sport Utility 4-Door) - GMC Yukon 2004-2007 V8 (4.8L, 5.3L, and additional engine years listed: 6.0L for 2004-2006 and 6.2L for 2007) - Cadillac Escalade 2004-2005 V8 5.3L, 2004-2006 V8 6.0L, and 2007 V8 6.2L (Sport Utility 4-Door)

That said, the listing also explicitly asks you to double-check fitment to make sure you’re choosing the correct part for your exact vehicle. That’s the kind of detail that often gets overlooked, and it’s not something to rush.

Coverage and support (what you can realistically expect)

SYKRSS includes customer service support and describes a 1-year unlimited-mileage quality guarantee. If there’s any problem with the fuel pump assembly, the expectation is that you contact the seller in time so they can help resolve it.

It’s a reassuring safety net, especially for a repair that can be inconvenient if it doesn’t fix the issue. Still, if your vehicle’s symptoms are caused by wiring, a relay, a fuel pressure regulator issue, or a clogged filter rather than the module itself, this won’t magically correct that. It’s best used when the module is truly the failing component.

Should you buy it?

Worth considering if you drive a compatible Chevrolet Tahoe, GMC Yukon, or Cadillac Escalade in the 2004-2007 V8 range listed above, and you want a replacement fuel pump module assembly that’s meant to match OE-style quality and function.

Not the best choice if you’re not confident in the exact fitment for your specific configuration. Since the listing calls out multiple reference numbers, it’s tempting to assume any similar year works—but fuel system parts can vary. If you’re diagnosing uncertain symptoms, you may want to confirm the root cause first.

Quick FAQ

FAQ

What does “electric fuel pump module assembly” replace?

It replaces an integrated electric fuel pump module assembly for the fuel delivery system. The goal is restoring proper fuel pressure and flow.

Which vehicles is it compatible with?

The listing states compatibility with certain Chevrolet Tahoe, GMC Yukon, and Cadillac Escalade models in specific years and V8 engine sizes. You should still double-check fitment for your exact vehicle.

Which reference numbers does it replace?

The listing includes MU1639 and 19256621, along with several additional OE reference numbers (as provided in the product details).

Is there a warranty?

Yes, the listing mentions a 1-year unlimited-mileage quality guarantee.

Is it designed to improve fuel efficiency?

SYKRSS describes optimized fuel pressure and flow to maximize efficiency and performance, but real results depend on overall vehicle condition and whether the module is the actual cause of the problem.

Final verdict

If your Tahoe/Yukon/Escalade’s fuel delivery issues point to a failing pump module and you’ve confirmed your fitment using the reference numbers and the engine/year details, the SYKRSS E3581M is a solid “get back to consistent fuel flow” type of replacement. Just don’t buy it on autopilot—make sure your vehicle matches the compatibility notes, because the main risk here is choosing the wrong module for your exact setup.