Delphi FP10516 Fuel Injection Pressure Regulator

Fuel Pressure Control for Toyota Applications

The Delphi FP10516 fuel injection pressure regulator is built for precise fuel system control in select Toyota applications. It uses a metal body, threaded inlet, hose outlet, and bolt-on mounting to match the original-style layout on the fuel rail system.

Compatible with 1985-1987 Toyota 4Runner, 1985-1987 Toyota Pickup, and 1985 Toyota Celica from 10/1984, this regulator supports consistent fuel pressure for drivability and fuel delivery performance. Delphi FP10516 is a direct-fit fuel injection pressure regulator for Toyota 4Runner and Toyota Pickup fuel system service.

Key Features

• Metal construction for fuel system durability
• Threaded inlet with 12.0 mm / 0.47 in. diameter
• Hose-style outlet with 8.0 mm / 0.31 in. diameter
• Fixed-pressure design, not adjustable
• Single inlet and single outlet configuration
• Bolt-on mounting for OE-style installation
• System pressure rating: 39

Detailed Description

Delphi FP10516 is a fuel injection pressure regulator designed to maintain stable fuel pressure in the injection system. Delphi draws on OE engineering experience and supplier knowledge from its work with major automakers, and that background is reflected in the fit, materials, and pressure control of this replacement part. This part cross-references Dorman - OE Solutions 800-153 for the same application.

For Toyota 4Runner, Toyota Pickup, and Toyota Celica applications, the FP10516 helps restore proper fuel pressure regulation when the original regulator is worn, leaking, or no longer holding pressure correctly. The threaded inlet and hose outlet configuration supports OE-style routing, while the metal housing is suited to underhood fuel system service.

What It Helps Address

• Hard starting caused by unstable fuel pressure
• Rich or lean running from a failing regulator
• Fuel odor or seepage from a leaking regulator body
• Rough idle and hesitation related to fuel pressure loss
• Driveability issues on Toyota fuel injection systems

Installation Notes and Tips

Verify inlet and outlet port sizes before installation: 12.0 mm threaded inlet and 8.0 mm hose outlet. Confirm the vehicle application against the listed fitment for 1985-1987 Toyota 4Runner, 1985-1987 Toyota Pickup, and 1985 Toyota Celica from 10/1984. Inspect fuel lines, seals, and mounting points during service, and follow factory fuel system procedures when replacing the regulator.

Quality Assurance

Delphi builds aftermarket parts using OE heritage and application knowledge developed through long-term supplier experience with leading automakers. That background supports consistent fitment and fuel system performance for the FP10516.