MALPASSI ST3778 Filter Fuel Pressure Regulator 85MM

( Brand: Malpassi ), ( Type: Fuel Pressure Regulator ), ( Manufacturer Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Items Included: Mounting Hardware ), ( Manufacturer Part Number: ST3778 ), ( Us Taxes And Duties: Prepaid ), ( Country Of Origin: Italy )

Review MALPASSI Filter 85mm Fuel Pressure Regulator fits KING

The Malpassi ST3778 Filter King 85mm Fuel Pressure Regulator is a high-performance fuel pressure regulator designed for use in automotive applications, particularly for those seeking to enhance the fuel delivery system in their vehicle. This regulator, manufactured by Malpassi, a leading name in the automotive fuel system industry, offers several advantages over stock or OEM regulators.

This 85mm regulator features a large, filter-mounted design, making it an excellent choice for applications that require increased fuel flow or those where the fuel system is subjected to high levels of contamination. The Filter King design integrates a 2-micron filter element into the regulator body itself, which prevents contaminants from entering the fuel system and ensures a clean fuel supply.

The Malpassi ST3778 is constructed of 6061-T6 aluminum, a lightweight yet robust material, and is anodized for added durability. It boasts an adjustable fuel pressure range from 35 to 100 psi, allowing users to fine-tune the fuel pressure to optimize engine performance. The regulator also includes a pressure relief valve to prevent damage from excessive fuel pressure.

This regulator is suitable for various fuel types, including gasoline, methanol, and ethanol, making it a versatile option for a wide range of automotive applications. The Malpassi ST3778 comes with a BSPP threaded inlet and outlet for easy installation and compatibility with various fuel lines.

The Malpassi ST3778 Filter King 85mm Fuel Pressure Regulator is an excellent choice for enthusiasts, racers, or anyone looking to upgrade their vehicle's fuel system for improved performance and reliability. Its large filter design, adjustable pressure range, and compatibility with various fuel types make it a valuable addition to any automotive project.

Malpassi St3778 Filter King 85mm Fuel Pressure Regulator: A Comprehensive Analysis

The Malpassi St3778 Filter King 85mm Fuel Pressure Regulator is a popular aftermarket fuel pressure regulator designed for high-performance applications. This regulator is known for its durability, adjustability, and the ability to filter fuel before it reaches the engine. In this analysis, we will discuss the pros and cons of purchasing a Malpassi St3778 Fuel Pressure Regulator.

1. Adjustable Fuel Pressure: The Malpassi St3778 regulator allows users to adjust the fuel pressure to their desired level, ensuring optimal engine performance.

2. Fuel Filtering: The integrated fuel filter removes contaminants, improving engine life and reducing the risk of fuel system failure.

3. Durability: Constructed from billet aluminum and featuring a robust design, this regulator is built to withstand the rigors of high-performance applications.

4. Easy Installation: The regulator comes with clear instructions and is relatively simple to install, making it an excellent choice for both professional mechanics and DIY enthusiasts.

1. Price: The Malpassi St3778 regulator is more expensive than OEM fuel pressure regulators. However, the added features and benefits may justify the additional cost for performance enthusiasts.

2. Size: The larger size of the regulator may require modifications to certain fuel lines or engine bays, making installation more challenging in some vehicles.

3. Potential Leaks: As with any fuel pressure regulator, there is a risk of leaks. Proper installation and the use of high-quality seals and gaskets can help minimize this risk.

The Malpassi St3778 Filter King 85mm Fuel Pressure Regulator offers several advantages for high-performance applications, including adjustable fuel pressure, fuel filtering, and durability. While it comes with a higher price tag and may require some modifications for installation, the benefits it provides can significantly enhance engine performance and longevity. Ultimately, the decision to purchase this regulator depends on your specific needs, budget, and the requirements of your vehicle.

If you are seeking improved fuel pressure control, filtration, and durability for your high-performance application, the Malpassi St3778 Filter King 85mm Fuel Pressure Regulator is an excellent choice. Its adjustability, integrated fuel filter, and robust design make it a valuable investment for those who demand the best from their vehicle's fuel system. However, carefully consider the potential challenges associated with installation and the higher cost before making your purchase.

part # st3778 prices

• $55.00-$151.20

specifications carbcaddie:

• for models: King
• brand: Malpassi
• type: Fuel Pressure Regulator
• manufacturer warranty: 1 Year
• fitment type: Direct Replacement
• items included: Mounting Hardware
• manufacturer part number: ST3778
• us taxes and duties: Prepaid
• country of origin: Italy

general carbcaddie:

• Car Truck Parts Accessories > Air Fuel Delivery > Carburetor Parts
• condition: Used

returns carbcaddie:

• policy: No Returns

offer carbcaddie:

• best offers: True
• started: May 31, 2026
• sold: 0
• options: Ship-to-home
• quantity: 1
• availability: In Stock

payments carbcaddie:

• wallet: Apple-pay
• other
• credit card: Discover

shipping carbcaddie:

• transit: 4-8 Days
• carrier: USPS
• service: USPS Ground Advantage
• cost: $5.58
• class: Standard
• type: Fixed

seller carbcaddie:

• # reviews: 1102
• rating: 100.0%

Malpassi ST3778 Is Similar To:

• Redline Weber 31800.063 Malpassi Fuel Pressure Regulator For Carbs 1.5 - 8.5 Psi (47.1% similar) $103.50–$141.50. (February 1st, 2025)
• Malpassi Fpr004 Filter King (50.6% similar) $38.81–$153.84. (August 5th, 2025)