If you need a fuel pressure regulator for an L5P Duramax, verify that the part is specifically listed for your model year and fuel system before buying. Of these five listings, only the Fleece Performance Engineering pigtail explicitly mentions the 2017–2022 L5P fuel pressure regulator circuit, and it is a connector—not a complete regulator. The other four products are low-pressure parts for carbureted engines or older gasoline vehicles, so they are not established as L5P-compatible replacements.
| Product | Best suited for | L5P fitment indicated? |
|---|---|---|
| Fleece sensor connector with pigtail | Replacing a listed L5P connector | Yes, connector only |
| LVOUP 1–5 PSI regulator kit | Carbureted fuel systems | No |
| CULMKARI injection regulator | Specified older Chevy and GMC applications | No |
| FQRANBO 12-804 regulator | Holley or Edelbrock carburetors | No |
| Pilida 9710 regulator kit | Carburetor setups using listed adapters | No |
Fleece L5P Sensor Connector With Pigtail
Best for: Repairing a compatible connector on a 2017–2022 L5P when the connector or wiring pigtail is the diagnosed problem. The listing names the L5P fuel pressure regulator, as well as the rear wheel speed sensor and alternator signal, among its applications.
This is the closest match to the L5P search, but it is a replacement sensor connector with pigtail, not a complete fuel pressure regulator. It was selected because its stated application specifically includes the L5P regulator connection.
Limitation: Do not choose it to replace a failed regulator assembly. Confirm the vehicle year, connector location, and repair need before ordering.
LVOUP 1–5 PSI Carburetor Regulator Kit
Best for: A carbureted setup needing an adjustable 1–5 PSI deadhead-style regulator. The listing describes a numbered adjustment dial and installation between the fuel pump and carburetor. It states that maximum input pressure should not exceed 7 PSI and that the unit can serve single- or twin-carburetor applications.
It is included as a comparison because it is a fuel pressure regulator, but its stated use is carburetors rather than an L5P diesel fuel system.
Limitation: The listing explicitly says it is not suitable for fuel injection systems. Avoid it for an L5P regulator replacement.
CULMKARI Gasoline Injection Pressure Regulator
Best for: Owners checking a replacement for certain listed older gasoline vehicles. Its fitment information names selected 1999–2003 Silverado and Sierra models, along with specified Avalanche, Express, Savana, and other applications. The description also identifies a vacuum line and replacement part numbers.
This product is relevant to general regulator research, not confirmed L5P fitment. Its listed vehicle and engine applications provide a specific comparison point for buyers with those older vehicles.
Limitation: The listed fitment does not identify an L5P Duramax. Do not infer compatibility based on the Chevrolet or GMC name alone.
FQRANBO 12-804 Adjustable Regulator
Best for: Carburetor users who want a 1–4 PSI adjustment range and a gauge port for monitoring pressure. The listing specifies Holley and Edelbrock carburetors, a 3/8-inch NPT gauge port, and a 1-in, 2-out layout.
The adjustment knob and stated pressure-stabilizing structure make this a comparison option for low-pressure carburetor systems. It is not presented as an L5P part.
Limitation: Its listed compatibility is for carburetors, not the L5P diesel system. Confirm port and pressure requirements for any intended application.
Pilida 9710 Manual Carburetor Regulator Kit
Best for: Carburetor installations using a Facet fuel pump that need a 1–5 PSI adjustment range. The kit description lists 1/4-inch, 5/16-inch, and 3/8-inch fuel connectors and identifies zinc alloy construction.
It was selected as another clearly specified low-pressure regulator option for carburetor buyers. Its adapter sizes may help those matching hose connections on a suitable carburetor setup.
Limitation: The listing describes carburetor use, not L5P fitment. The presence of multiple adapters does not establish compatibility with a diesel fuel system.
Buying Guide: How To Choose An L5P Fuel Pressure Part
Are you replacing the regulator or its connector?
Start by identifying the failed component. A wiring or connector fault may call for a pigtail, while a mechanical or electronic regulator problem may require a different assembly. The Fleece listing identifies a connector for the L5P regulator circuit; it does not claim to include the regulator itself.
How can you confirm L5P compatibility?
Match the part to the truck’s model year, engine, and exact component location. Check the manufacturer’s application information and compare the part number or connector shape with the original part. A product described for a Chevrolet or GMC vehicle is not automatically suitable for an L5P Duramax.
Why do the PSI ranges matter?
The four regulator kits here list low pressure ranges intended for carbureted engines, such as 1–4 PSI or 1–5 PSI. Those specifications do not establish suitability for an L5P diesel fuel system. Do not select a regulator simply because its pressure is adjustable; verify that its application and pressure requirements match the vehicle.
What should you verify before ordering?
- Confirm whether the diagnosed issue is the regulator, sensor connector, or wiring.
- Check the exact year and engine application in the product fitment details.
- Compare connector, port, and hose details with the original component.
- For diesel-system parts, use specifications intended for the L5P rather than carburetor regulator descriptions.
Frequently Asked Questions
Is the Fleece product a complete L5P fuel pressure regulator?
No. The listing describes a replacement sensor connector with pigtail and names the L5P fuel pressure regulator connection as an application.
Can a 1–5 PSI carburetor regulator replace an L5P regulator?
These listings do not establish that compatibility. The low-pressure kits are described for carburetor applications, and one explicitly excludes fuel injection systems.
Which product listed here specifically mentions the L5P?
The Fleece Performance Engineering connector listing explicitly names the 2017–2022 L5P fuel pressure regulator application.
What information should I have before buying an L5P part?
Have the truck’s model year, engine identification, the failed component’s part number, and details about the connector or assembly available for fitment verification.