Fuel Pump Wiring Kit, Tall Hanger WP3T
Fuel Pump Wiring Kit, Tall Hanger WP3T
High-Output Fuel Pump Wiring Kit | Tall Hanger (Metal)
Item #: FPWK-029D
Product Overview
The Racetronix FPWK-029D is a heavy-duty power solution specifically engineered for GM vehicles utilizing the "Pump on a Stick" metal hanger assembly (pre-plastic module era). Beyond performance, this kit is a critical safety upgrade for high-flow DCSS series pumps.
Factory fuel pump circuits were never designed to handle the 20+ amp draw of modern high-output pumps. Attempting to run these pumps on original thin-gauge wiring frequently leads to blown fuses and catastrophic heat damage, often melting in-tank wiring, bulkhead connectors, factory relays, and even terminals inside the factory fuse center. This kit bypasses these vulnerable factory components, delivering maximum voltage directly from the alternator to the fuel pump while protecting your vehicle’s electrical integrity.
Compatibility & Configuration Guide
Verify your configuration before ordering to ensure correct fitment:
| Hanger Type: | Metal "Pump on a Stick" Tall Hangers. Ideal for common assemblies such as the Delphi HP10000 found in 1980s and early 90s GM SUVs/Trucks. |
| Bulkhead Interface: | Utilizes the BCA-4W Bulkhead Connector for secure, fuel-safe, vapor-proof pass-through. |
| Pump Compatibility: | Optimized for high-flow DCSS series pumps including F90000274 (commonly referred to as the 450LPH) and F90000285 (commonly referred to as the 525LPH). |
Harness Input Side: Weather-Pack Keying & Pinout
NOTE: This guide applies ONLY to the INPUT connector of the Racetronix Hotwire Harness.
3-POS 6-0-X
(Standard Harness)
3-POS 0-X-0
(RCS-089 / HP10000)
2-POS 3-0 Pattern
(1985-1991 S10)
| Cavity | 3-POS Function | 2-POS Function | Wire Color |
|---|---|---|---|
| A | Ground | Relay Trigger | Black (3P) / Gray (2P) |
| B | Level Sensor | Level Sensor | Violet |
| C | Relay Trigger | N/A | Gray |
Frequently Asked Questions (FAQ)
Q: Can I use this kit for late-model vehicles with a plastic fuel pump module (reservoir/bucket design)?
A: No. Plastic fuel modules typically require different connector types and utilize integrated bulkhead connectors of a different configuration. This kit is specifically designed for the GM/Delphi "Pump on a Stick" metal hangers found in most 1980s and early-to-mid 90s GM SUVs and pickup trucks.
Q: Why doesn't the 3-pin connector mate with my factory harness?
A: This refers to the input side of the Racetronix Hotwire Harness. GM used several different "keys" for the Weather-Pack housings. We include the RCS-089 kit so you can quickly swap the housing to match your specific vehicle's configuration (e.g., the 0-X-0 pattern common to the Delphi HP10000).
Q: How does this kit achieve such a high current rating compared to factory wiring?
A: Performance is achieved through "Parallel Pathing." We utilize an ultrasonic welding process to bond the main 10AWG power wire to two 14AWG conductors. These run in parallel through two separate terminals on the BCA-4W bulkhead connector, effectively doubling the current capacity. Inside the tank, dual 14AWG Teflon-insulated wires continue this parallel path directly to the pump.
Q: Why do I have to drill a hole for a brass grounding stud?
A: High-output pumps require a robust ground path that factory bulkhead terminals cannot provide. By using an external 1/4" brass stud for the high-current ground, we free up terminals in the bulkhead for the dual positive power feeds. Furthermore, this isolates the pump's heavy ground load from the level sensor's ground circuit, preventing ground potential differential and ensuring your 0-90 Ohm fuel gauge remains accurate.
Q: Why is the orientation of the bulkhead connector's stainless steel clip so critical?
A: The BCA-4W bulkhead uses different terminal maps. While the atmosphere side (IPH) uses an A-B-C-D map, the center of the connector features an E-B-D-C (Echo-Bravo-Delta-Charlie) map that must align with the in-tank harness. If the stainless steel clip is installed 180° out of phase, the in-tank connector will latch backward and the terminals will not line up, leading to potential electrical damage.
Q: What is the output connector used on this harness?
A: The output side uses a heavy-duty Metri-Pack 280-series connector. This is designed for high-current delivery directly to the fuel pump bulkhead and has no relation to the input side Weather-Pack keying.
Q: Can I run a Walbro 525 (F90000285) pump with this kit?
A: Yes. However, please note the entire assembly is rated for a maximum of 28 Amps continuous draw due to the physical limitations of the bulkhead connector pins.
Confirm Your Vehicle Configuration
Before purchasing, we highly recommend verifying your specific fuel hanger and connector type using the Delphi Auto Parts Catalog. Enter your vehicle's VIN number and review the images to verify your factory wiring orientation.
