E3621S Electric Fuel Pump Module Assembly For 1998-1995 Chevrolet C1500 C1500 C2500 C3500 K1500 K2500 K3500 GMC C1500

E3621S Fuel Pump Sender Assembly for 1988–1995 Chevrolet and GMC C/K Trucks

Extended cranking, intermittent no-start, low fuel pressure, hesitation under load, stalling, or an inaccurate fuel-gauge reading can involve the in-tank pump and sender assembly. This BDFHYK E3621S aftermarket replacement is listed for specific 1988–1995 Chevrolet and GMC C/K pickup and chassis-cab applications. The current product title reverses the year order as “1998–1995”; confirm the exact model, engine, tank, connector, sender geometry, and OE number before installation.

Confirm E3621S Chevrolet and GMC C/K Fitment

C1500, C2500, K1500, and K2500 Applications

• Listed 1988–1995 Chevrolet and GMC C1500, C2500, K1500, and K2500 gasoline applications with the applicable 4.3L V6, 5.0L V8, 5.7L V8, or 7.4L V8 engine by model year
• The 7.4L application has narrower model-year coverage than the smaller engines and must be verified through the OE number and removed assembly

C3500, K3500, and C3500HD Applications

• Listed 1988–1995 Chevrolet and GMC C3500 and K3500 gasoline configurations with applicable 5.7L or 7.4L engines by model year
• Listed 1991–1995 C3500HD configurations where the original sender assembly and tank match E3621S or the applicable cross-reference

Do not treat 1988–1995 as a universal range for every engine and truck configuration. Cab, wheelbase, single or dual tank, tank capacity, tank position, and sender resistance can change the required assembly.

E3621S and 25028611 Cross-Reference

Listed OE and Interchange Numbers

E3621S, SP01A1H, Carter P8000S, Delphi HP10000, and GM 25028611.

Verify Single- or Dual-Tank Configuration

Compare the tank position, lock-ring opening, electrical connector, fuel-line fittings, pickup tube, strainer, sender arm, resistance range, seal, and retaining hardware with the removed assembly. A front, rear, or auxiliary tank can require a different sender geometry.

Check the C/K Truck Fuel System Before Replacement

Pressure, Voltage, and Sender-Circuit Tests

• Measure fuel pressure during key-on, cranking, idle, and load
• Check available voltage and ground at the pump under operating load
• Inspect the relay, fuse, wiring, connector, fuel filter, lines, pressure-control components, and injectors
• Test the sender resistance, gauge circuit, and tank-selector circuit on dual-tank trucks

Inspect the Tank and Pickup Area

Rust, sediment, water, degraded fuel, or debris can restrict the strainer and damage a replacement pump. Clean the tank and correct corrosion or contamination before installing the new sender assembly.

E3621S Installation Notes

Record the Tank Position and Sender Geometry

Before removal, identify the tank position and photograph the line routing, connector, pickup, sender arm, and float orientation. Relieve fuel pressure, disconnect the battery, support the tank safely, and clean the tank opening.

Prime, Leak-Test, and Confirm Gauge Operation

Use the correct seal and confirm full retaining-ring engagement. After installation, prime the system, verify pressure, inspect every fuel connection and the tank seal for leaks, confirm gauge operation, and test the tank-selection system where equipped.

Before Ordering the E3621S Fuel Pump Sender

1988–1995 C/K Truck Checklist

• Correct the current title mentally to the verified 1988–1995 model range
• Confirm the exact Chevrolet or GMC model, engine, cab, wheelbase, and tank position
• Verify single- or dual-tank configuration and tank capacity
• Match E3621S, 25028611, or the applicable interchange number
• Compare connector, line fittings, pickup, sender arm, float, and resistance configuration
• Confirm the seal and retaining hardware shown with the product

This is a BDFHYK aftermarket replacement fuel pump and sender assembly, not a Chevrolet, GMC, or GM factory OEM component.