Proton Jumbuck / Arena / Wira / Satria 1.3, 1.5 EFI Genuine Mitsubishi Fuel Pressure Regulator – PW550539

If your Proton is running rich, struggling to idle, hesitating under load, or using more fuel than it should, a faulty fuel pressure regulator could be the cause.

This listing offers multiple fuel system options depending on your setup, including fuel pressure regulators and a fuel rail adaptor for those wanting to run an aftermarket external fuel pressure regulator.

These parts may be supplied as Genuine Proton, OEM, Mitsubishi, or superior-quality aftermarket parts depending on availability. All options supplied are selected for their fitment, reliability, and performance.

Available Variations

1. Fuel Pressure Regulator – PW550539

Designed to maintain correct fuel pressure for stable idle, smooth throttle response, and proper air-fuel ratios in selected EFI models.

Suitable For:

• Proton Jumbuck 1.5 EFI
• Proton Arena 1.5 EFI
• Proton Wira 1.5 EFI
• Proton Satria 1.5 EFI

Note: EFI models only. Please confirm fitment before purchase if unsure.

2. Fuel Pressure Regulator – MD179023

This variation suits selected 4G91 / 4G92 / 4G93 engine applications and is ideal for higher-spec Proton models using these engine platforms.

Suitable For:

• Proton Satria GTi
• Proton Putra
• Proton M21
• Other applications running 4G91 / 4G92 / 4G93 engines

3. Fuel Rail Adaptor for Aftermarket External Fuel Pressure Regulators

For those upgrading or modifying their fuel system, this variation allows you to run an aftermarket external fuel pressure regulator from the factory fuel rail setup.

Ideal for custom builds, performance applications, or anyone converting away from the factory regulator arrangement.

Why Replace Your Fuel Pressure Regulator?

A failing regulator can cause inconsistent fuel pressure, which affects the way the engine runs and responds.

Common symptoms include:

• Rough or unstable idle
• Running rich
• Poor fuel economy
• Fuel smell
• Hesitation under acceleration
• Hard starting

Replacing the faulty unit helps restore correct fuel delivery, smoother performance, and proper engine response.

What You Get

You will receive one item based on the variation selected:

• 1 x Fuel Pressure Regulator PW550539, or
• 1 x Fuel Pressure Regulator MD179023, or
• 1 x Fuel Rail Adaptor for external fuel pressure regulator conversion

Parts supplied may be Genuine Proton, OEM, Mitsubishi, or superior-quality aftermarket parts depending on availability.

If you need anything else added to this kit, please email us at please email us at support@theracecartel.com.

If you are purchasing small parts, you are better off purchasing a few small parts to save on shipping costs. 

WE SHIP WORLDWIDE - If there are no shipping options for your country at checkout or you can't find the parts you need, please email us at support@theracecartel.com and we will provide you with parts and shipping costs.

Shipping Costs are also based on volumetric weight (based packaging dimensions)  and not the actual weight of the item.

We practice a transparent pricing model where the shipping prices are shown is the actual shipping costs instead of inflating prices and advertising them as "Free Shipping".

This not only helps with custom clearance with most countries as the cost of parts usually fall below the dutiable threshold and the major cost from Malaysia is shipping.