Hold fuel pressure steady and keep injector delivery precise with the Standard Ignition Fuel Injection Pressure Regulator PR578. This returnless-type regulator controls the pressure of the fuel supplied to the injectors, and it installs directly as a replacement across a range of Toyota applications — the 2019 and 2021 Toyota Avalon [V6-3.5L], 2018-2022 Toyota Camry [L4-2.5L and V6-3.5L], 2017-2019 Toyota Highlander [V6-3.5L], 2017-2020 Toyota Sienna [V6-3.5L], and the 2016-2021 and 2023 Toyota Tacoma [V6-3.5L]. See the Buyer's Guide tab for the full list.
- Toyota-matched calibration: designed to match the fuel-delivery characteristics of these Toyota engines for consistent, precise fuel delivery.
- Returnless, non-adjustable design: a returnless-type regulator with one inlet and one outlet and no boost/vacuum reference port.
- Stainless steel construction: built from corrosion-resistant stainless steel with a silver finish to withstand extreme conditions and prolonged use.
- Validation tested: the manufacturer's validation process includes 200+ hours of vibration testing plus 1000+ hours of extreme heat and cold operational testing and on-vehicle testing.
Supplied new. Mounting hardware is not included — consult the vehicle service information for the correct fasteners and whether they may be reused. Country of origin: Brazil.
Manufacturer part number PR578.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does the PR578 fuel pressure regulator do?
It controls the pressure of the fuel supplied to the injectors so delivery stays consistent. The PR578 is a returnless-type, non-adjustable regulator with one inlet and one outlet.
Will the PR578 fit my vehicle?
It's listed for the 2019/2021 Avalon, 2018-2022 Camry (L4-2.5L and V6-3.5L), 2017-2019 Highlander, 2017-2020 Sienna, and the 2016-2021 and 2023 Tacoma (V6-3.5L). Check the Buyer's Guide tab.
What are signs my fuel pressure regulator may need replacing?
Hard starting, rough idle, hesitation, or a fuel odor can be signs. These symptoms have other causes, so diagnose the fuel system first to confirm the regulator is at fault before replacing it.
Is mounting hardware included, and is it adjustable?
No hardware is included, and the regulator is non-adjustable. Consult your vehicle service information for the correct fasteners and whether they can be reused.
What is the regulator made of and where is it made?
It's constructed from corrosion-resistant stainless steel with a silver finish. Country of origin: Brazil.
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