Product Description
Cummins 3924726 — Fuel Return Check Valve (Filter Housing Location)
MPN: 3924726 | Also Known As: fuel return check valve, return line check valve | Cross-Refs: Mopar 4761265; related IDs 3916360, 3918188
Why This Part
- ✓ OE valve that maintains one-way fuel return flow and prevents backflow.
- ✓ Direct-fit for 1989–1998 5.9L 12-valve (VE & P7100 mechanical) Rams.
- ✓ Correct location: mounts on top of the fuel filter housing (not the injection pump valve).
- ✓ Restores proper idle/starting by holding residual pressure in the return circuit.
Quick Specs
| Type | Fuel return check valve |
|---|---|
| OE Part # | 3924726 |
| Location | Fuel filter housing (return line) |
| Qty Required | 1 per engine (sold individually) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–1998 | Ram 5.9L 12-valve (VE ’89–’93, P7100 ’94–’98) | Ram 2500/3500 |
Industrial/Off-Highway: Common on B-Series platforms including 3.9L 4BT, 5.9L 6B/6BTA, and 8.3L 6CTA (verify by ESN).
Often Paired With
- New sealing washers for the return line banjo fittings (size varies by application).
- Fuel filter (replace when servicing the filter housing).
What’s In The Box
- (1) Genuine Cummins Fuel Return Check Valve (3924726)
- Seals/washers sold separately (see “Often Paired With”).
Install Tips
- Mounts on top of the fuel filter housing (not the injection pump); orient as removed.
- Use new sealing washers; torque fittings to spec and check for leaks after start-up.
- Prime the system and recheck after first heat cycle.
FAQ
WILL THIS FIT MY 1989–1998 5.9L 12-VALVE RAM?Yes—this is the OE return check valve for ’89–’98 5.9L 12-valve trucks. Verify by VIN/ESN if components have been changed.
IS THIS THE CHECK VALVE AT THE INJECTION PUMP?No—this valve installs on the fuel filter housing. The VP44 overflow/check at the injection pump (’98.5–’02) is a different part (e.g., Cummins 3941156).
WHAT DOES THIS REPLACE OR CROSS TO?Replaces Mopar 4761265; related Cummins IDs seen in catalogs include 3916360 and 3918188.
DO I NEED NEW SEALS OR WASHERS?Yes—replace the sealing washers on the banjo fittings to prevent leaks (sizes vary by line/fitting).
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3924726 built to factory specifications.
