CUMMINS 3924726 OEM FUEL RETURN CHECK VALVE – RAM 5.9L 12V (1989–1998)

Product Description

The Cummins 3924726 OEM Fuel Return Check Valve is the factory-correct overflow/check valve used on the 5.9L 12-Valve Cummins (1989–1998) to regulate injection pump return pressure and maintain proper fueling performance. This genuine Cummins component ensures correct cracking pressure, stable idle quality, and proper lubrication flow through the VE and P7100 (“P-pump”) injection pumps.

A worn or sticking return check valve can cause hard starts, excessive fuel return, low injection pump inlet pressure, low-power complaints, or surging idle. Replacing it with a genuine Cummins 3924726 valve restores proper fuel system function and long-term reliability.

Fitment

• 1989–1993 Dodge Ram 2500/3500 with 5.9L 12-Valve Cummins (VE44 rotary injection pump)
• 1994–1998 Dodge Ram 2500/3500 with 5.9L 12-Valve Cummins (P7100 mechanical injection pump)
• 5.9L 12V B-Series engines using OEM return/overflow valve assemblies

Note: VE and P7100 pumps use different cracking pressures, but Cummins lists 3924726 as the OE return check valve for the 12V platform. Always verify by pump model or ESN if unsure.

Cross-Reference (Cummins-Only)

Related Cummins fuel system parts:
• Cummins 3930330 OEM Fuel Shutoff Solenoid – 5.9L 12V
• Cummins 3931063 OEM Fuel Filter Head Assembly
• Cummins 3933328 OEM Fuel Transfer Pump – 12V
• Cummins 3903924 Timing Pin – 12-Valve

FAQ

What does the Cummins 3924726 fuel return check valve do?

It regulates fuel return pressure and ensures proper lubrication flow through the injection pump by maintaining a calibrated cracking pressure.

What symptoms indicate a failing return check valve?

Hard starting, low idle pressure, surging, excessive return fuel, low power, and inconsistent fueling are common signs of a worn valve.

Does this fit both VE and P7100 pumps?

Yes — it is the OEM return valve for both 1989–1993 VE-pump trucks and 1994–1998 P-pump 12V trucks. Cracking pressure differs internally but Cummins supplies 3924726 for both systems.

Should the copper sealing washer be replaced?

Yes. Whenever the check valve is removed, the sealing washer should be replaced to prevent leaks and maintain correct return pressure.

Specifications for cummins 3924726