Improve fuel pressure and extend injector life with this Fuel Relief “Blue” Spring Upgrade Kit for 1999–2003 Ford 7.3L Power Stroke diesel engines. This upgrade is a proven modification for Power Stroke owners, raising fuel pressure to optimal levels for better injector performance, smoother idling, and improved reliability. A factory relief spring can weaken over time, causing low fuel pressure and potential injector damage. The Blue Spring Upgrade restores correct fuel pressure and keeps your 7.3L running strong.
What’s Included in the Kit:
-
1 × High-Pressure Blue Relief Spring
-
Required Seals and Hardware for Installation
Features and Benefits:
-
Designed specifically for 1999–2003 Ford 7.3L Power Stroke
-
Increases and maintains optimal fuel pressure for injectors
-
Prevents injector wear caused by low fuel pressure
-
Enhances throttle response and overall drivability
-
Built from durable, high-quality materials
-
Easy, cost-effective upgrade for long-term fuel system reliability
-
Direct-fit design with all necessary seals included
Vehicle Compatibility:
-
1999–2003 Ford F‑250 Super Duty 7.3L Power Stroke
-
1999–2003 Ford F‑350 Super Duty 7.3L Power Stroke
-
1999–2003 Ford F‑450 / F‑550 Super Duty 7.3L Power Stroke
-
2000–2003 Ford Excursion 7.3L Power Stroke
-
1999–2003 Ford E‑350 / E‑450 Vans 7.3L Power Stroke
Upgrading to the Blue Spring Kit is one of the most effective ways to ensure consistent fuel delivery and safeguard your injectors against premature failure. It’s a simple upgrade that delivers big reliability improvements for your 7.3L Power Stroke.
Shipping Disclaimer:
✔️ We ship via USPS, UPS, and FedEx.
✔️ Carrier selection is based on package size, weight, and destination.
✔️ Expedited shipping options is available, call to check freight options
✔️ Orders are processed within 1 business day (Monday–Friday).
✔️ Orders placed on weekends or holidays will be processed on the next business day.
✔️ Tracking information will be provided once the item ships.
✔️ Shipping to PO Boxes, APO/FPO may be limited based on carrier restrictions.
California Proposition 65 Warning:
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm.
For more information, go to www.P65Warnings.ca.gov
Interchange Part Number:
- Interchange Part #s : F81Z-9C065-AA / F81Z-9H323-BB, BLUE SPRING KIT
- Includes: 4 FUEL LINE GROMMETS, 2 DRAIN VALVE ORINGS, 2 FUEL HEATER ORINGS, & 1 PRESSURE RELIEF VALVE ORING
