TOPSCOPE Fuel Pump Assembly for Chevy Silverado & GMC Sierra 1999-2004 — Direct OE Replacement with Sending Unit & Pressure Sensor

TOPSCOPE's fuel pump assembly replaces OE part E3500M to restore reliable fuel delivery and accurate fuel-level readings on compatible Chevy and GMC pickups.

Designed to be a direct replacement for the original equipment, this electric fuel pump assembly includes the sending unit and fuel pressure sensor needed for smooth operation in select Chevy Silverado and GMC Sierra models from 1999 through 2004. Built to match factory fit and function, the unit simplifies installation while maintaining the fuel pressure and tank-level feedback required by the vehicle's fuel system and dashboard gauges.

Will this fuel pump fit my truck?

Confirming fitment is essential: the TOPSCOPE pump is intended for specific model years and engine sizes listed in the product details. Check the fitment tool or your vehicle's original part number to ensure compatibility before purchasing.

• Replaces OE part number E3500M for direct fit.
• Compatible with Silverado 1500 V6 4.3L and V8 4.8L/5.3L (1999–2003).
• Compatible with Silverado 1500 V8 6.0L (2003); Silverado 3500 V8 6.0L/8.1L (2001–2003).
• Compatible with GMC Sierra 1500 V6 4.3L and V8 4.8L/5.3L (1999–2003), and Sierra 2500 V8 5.3L/6.0L (1999–2000).

What components are included and how do they compare to the original?

The assembly contains the pump, integrated sending unit, and a fuel pressure sensor designed to replicate the factory assembly's performance. That means you get the same mounting pattern, electrical connector compatibility, and tank interface to minimize modifications.

• Complete pump assembly with sending unit for accurate fuel level readings.
• Fuel pressure sensor included to maintain correct system pressure data.
• Manufactured as a direct OE replacement to match original fit and connectors.

How difficult is installation and what should I prepare?

Installation follows the same steps as replacing an OE in-tank pump, so basic automotive experience and common tools are usually sufficient. Plan for depressurizing the fuel system, safely supporting the vehicle or tank, and following vehicle-specific service instructions for access and seal replacement.

• Tools needed: basic hand tools, fuel line disconnects, and safety equipment.
• Expect time for tank removal or access through service cover, depending on model.
• Replace tank O-ring or sealing gasket to prevent leaks after installation.

What warranty and support come with this fuel pump?

TOPSCOPE backs this fuel pump assembly with a 1-year (365-day) unlimited mileage warranty, giving protection against manufacturing defects during normal use. Customer support and return options are available through the seller—always verify your fitment before installation to avoid unnecessary returns.

• 1 year / 365 days unlimited mileage warranty included.
• Contact seller support for warranty claims and troubleshooting help.
• Double-check fitment details to ensure correct part selection before installation.

Who is this for: This TOPSCOPE fuel pump assembly is intended for owners, mechanics, and restoration specialists working on late-1990s to early-2000s Chevrolet Silverado and GMC Sierra trucks that require a direct OE-replacement pump with sending unit and fuel pressure sensor. It's particularly suited for those who want a like-for-like replacement (E3500M equivalent) to restore fuel delivery, maintain accurate fuel gauge operation, and avoid adapting non-original parts. If you need guaranteed compatibility, follow the vehicle-year and engine-size compatibility list and verify against your truck's existing part number before purchase.