Russell 650603 Inline Check Valve -6 AN Male to -6 AN Male Black Anodized 3-PSI

Vehicle Fitment

• Universal - fits any fuel or fluid system application using -6 AN male connections

Fitment Notes

• Inline installation - installs anywhere in a -6 AN fuel line between the fuel pump and carburetor or fuel rail
• Compatible with mechanical and electric fuel pumps, carbureted and fuel-injected systems
• Designed to be mounted horizontally for optimal check piston operation
• Sold individually - one check valve per package

Features

• One-way flapper valve design allows fuel flow in one direction only - prevents fuel from bleeding back to the tank and eliminates hard starting after the vehicle has sat
• Low 3 PSI opening pressure makes it ideal for fuel system use without restricting flow at typical fuel pump delivery pressures
• 304 stainless steel check piston delivers optimum flow with minimal restriction and pressure loss
• Positive O-ring seal incorporated into the high-flow check piston for leak-free, reliable sealing
• Lightweight aluminum body in black anodized finish matches other Russell Performance fittings and hose ends
• -6 AN male threads on both inlet and outlet for direct connection into any -6 AN female fitting or hose end
• Legal for use on emissions-controlled and non-emissions-controlled vehicles

Specifications

• Part Number: 650603
• Brand: Russell Performance
• Type: One-way inline check valve (flapper)
• Inlet: -6 AN male
• Outlet: -6 AN male
• Body Material: Aluminum
• Check Piston: 304 stainless steel
• Seal: Positive O-ring
• Finish: Black anodized
• Opening Pressure: 3 PSI
• Quantity: Sold individually

Included Components

• 1x Russell -6 AN inline check valve (black anodized)

Product Description

The Russell 650603 is a universal inline one-way check valve designed for fuel system applications using -6 AN male connections. The valve allows fuel to flow in one direction only - from the pump to the carburetor or fuel rail - while preventing fuel from bleeding back down the line toward the tank when the engine is off. This addresses the common problem of hard or extended cranking after the vehicle has sat for several days, caused by fuel draining back and leaving the line and bowl dry. The 3 PSI low opening pressure ensures the valve opens freely at typical fuel pump delivery pressures without restricting flow or starving the engine.

The high-flow 304 stainless steel check piston minimizes restriction and pressure loss while the integrated positive O-ring provides a leak-free seal at the piston. The lightweight aluminum body with black anodized finish matches Russell's full range of Performance fittings and hose ends for a clean, professional-looking installation. The valve installs inline anywhere between the fuel pump and the carburetor or fuel rail using -6 AN female connections at each end, and is designed to be mounted horizontally. Compatible with mechanical and electric fuel pumps and legal for use on both emissions-controlled and non-emissions-controlled vehicles. Sold individually.