Will it fit and work with my 1999 1500 Silverado?

Yes, but please note that FP3500M and FP3501M both fit CHEVROLET SILVERADO 1500, FP3500 has 2 Electrical Connectors On The Pump Assembly, w/Module Code TCF, FP3501M is has 1 Electrical Connector On The Pump Assembly, w/Module Code TCU.

Does it say anywhere what the flow output is?

Not sure installed few .months ago.. works perfect on chevy 4.8 , 5.3 motor with my experience

How do i know if i need 3500 or 3501?

Take a picture of your old pump(Use your cell phone, you can take the picture without pulling it out), if there are 2 sensors on the top of the pump, then you need 3500, if there is only 1 sensor, you need 3501.

Does this fit a 2001 2500 Suburban 8.1L

I know it fits a 2001 5.3L GMC Sierra, if you input your vehicle or will tell you if it will work on your make and model, or recommend something that fits your vehicle.

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Fuel Pump Compatible with Chevy Pickup Silverado GMC Sierra 1999 2000 2001 2002 2003 2004 4.3L 4.8L 5.3L 6.0L 8.1L w/sending unit fuel pressure sensor replaces # E3500M

Fuel Pump Compatible with Chevy Pickup Silverado GMC Sierra 1999 2000 2001 2002 2003 2004 4.3L 4.8L 5.3L 6.0L 8.1L w/sending unit fuel pressure sensor replaces # E3500M

Product ID: 20109514

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Details

Brand
TOPSCOPE
Fit Type
Vehicle Fit
Vehicle Service Type
Truck
Item dimensions L x W x H
17.5 x 7.5 x
Material
Metal

⚡12V Electric Power

🔧Direct OE Replacement

🛠️Vehicle-Specific Fit

Description

⛽ Fuel your drive with precision power and zero downtime!

BUILT TO LAST - Durable metal construction ensures long-term durability under pressure
PLUG PLAY INSTALLATION - Vehicle-specific fit means hassle-free upgrade and instant road readiness
POWER PACKED PERFORMANCE - Reliable 12V electric operation for consistent fuel delivery
SEAMLESS OE COMPATIBILITY - Fits Chevy Silverado & GMC Sierra 1999-2004 with precision
WARRANTY BACKED CONFIDENCE - 1 Year unlimited mileage warranty for zero compromise

The TOPSCOPE Fuel Pump is a direct OE replacement designed specifically for Chevy Silverado and GMC Sierra trucks (1999-2004) with 4.3L to 8.1L engines. Featuring a robust 12V electric motor and durable metal body, it guarantees reliable fuel pressure and seamless fitment. Backed by a 1-year unlimited mileage warranty, this pump ensures your truck runs smoothly with OEM-level performance and easy installation.

Specifications

Brand	TOPSCOPE
Fit Type	Vehicle Specific Fit
Vehicle Service Type	Truck
Item dimensions L x W x H	17.5 x 7.5 x 5.5 inches
Material	Metal
Item Weight	2.6 Pounds
Style	Electric
Auto Part Position	Inside
Outlet Connection Size	7.5 Inches
Outlet Connection Type	Barb or Flare or BSP or FNPT
Body Material	Metal
Inlet Connection Type	Threaded
Connector Type	BSPP
Gas Type	Gasoline
Mounting Type	Tank Mount
Operation Mode	Electric
Product Grade	New
Automotive Fit Type	Vehicle Specific Fit
OEM Part Number	ACDELCO MU1089, MU1207, MU1370, MU1516, MU1613, MU1757, MU86, AIRTEX E3500M, BOSCH 67305, 67450, CARTER P74835M, P76223M, DELPHI FG0053, FG0407, GM 19121626, 19153711, 19177272, 25176865, 25345026, 25348344, 88965373, PIERCE P1503M, P1538M, WALBRO TU432
Manufacturer	TOPSCOPE
UPC	601209651385
Item Weight	2.6 pounds
Product Dimensions	17.5 x 7.5 x 5.5 inches
Item model number	5824073830
Is Discontinued By Manufacturer	No
Exterior	General Motor
Manufacturer Part Number	FP3500M
Voltage	12 Volts