Product Description
The CUMMINS 3941156 OEM VP44 OVERFLOW VALVE is the factory-engineered fuel system check valve that regulates inlet pressure to the VP44 injection pump on 1998.5–2002 5.9L 24-valve Cummins engines. When this valve weakens, sticks, or leaks, the VP44 loses proper supply pressure — causing hard starts, stalling, low power, dead pedal conditions, and premature VP44 pump failure. Installing this genuine Cummins overflow valve restores correct feed pressure so the VP44 pump stays properly lubricated and cooled.
This is a genuine Cummins part — not an aftermarket copy — ensuring the correct spring calibration, sealing, and long-term durability required for the VP44 pump’s survival. If your truck is suffering from zero fuel pressure on startup, slow prime, erratic idle, or inconsistent lift pump readings, this check valve is a critical fix.
Key Features & Benefits
- Genuine Cummins 3941156 VP44 overflow (check) valve.
- Restores correct inlet pressure to the VP44 injection pump.
- Prevents VP44 damage caused by low or unstable supply pressure.
- Direct-fit replacement for 1998.5–2002 24V Cummins fuel filter housing.
- Critical upgrade when replacing the lift pump or VP44.
Fitment
Designed for the following applications:
- 1998.5–2002 Dodge Ram 2500 5.9L 24-valve Cummins (VP44)
- 1998.5–2002 Dodge Ram 3500 5.9L 24-valve Cummins (VP44)
Location: Fuel filter housing (top outlet port).
Function: Maintains VP44 feed pressure and prevents drain-back.
Recommendation: Replace whenever VP44, lift pump, or filter housing is serviced.
Cross-Reference
- Cummins: 3941156 (this part)
- Earlier Cummins supersession: 3936316
- Mopar dealer reference: 5015580AA
Cross-reference numbers are for identification only — verify by VIN/ESN if unsure.
Related Genuine Cummins Parts (Working Cummins Links Only)
- CUMMINS 3937111 FRONT CRANKSHAFT SEAL SERVICE KIT – 5.9L CUMMINS
- CUMMINS 3804899 OEM FRONT CRANKSHAFT SEAL – 5.9L/6.7L
- CUMMINS 3920706 OEM TURBO DRAIN EXPANSION PLUG – 5.9L/6.7L
Installation Notes
- Remove the old check valve from the fuel filter housing using the correct socket.
- Inspect for debris, collapsed seals, or stuck plunger.
- Install the new valve and torque per OEM spec.
- Prime the fuel system fully before startup.
- Verify lift pump pressure (10–14 PSI recommended for VP44 survival).
Specifications for cummins 3941156
| Specification | Detail |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Part Number | 3941156 |
| Function | VP44 Overflow/Check Valve – Fuel Pressure Regulation |
| Engine Compatibility | 1998.5–2002 5.9L 24-valve Cummins (VP44) |
| Fuel Type | Diesel |
| GTIN | Not published by Cummins |
| UPC | Not published by Cummins |
| Shipping Weight | Approx. 1.0 lb (packaged) |
| Shipping Dimensions | 3 × 3 × 2 in (approx.) |
| Shipping Method | Standard small-parcel ground |
| Cross Reference | 3936316; Mopar 5015580AA |
| E-Codes / Emissions | Not specified (OE component) |
| Prop 65 Warning | This product may expose you to chemicals known to the State of California to cause cancer and reproductive harm. www.P65Warnings.ca.gov |
FAQ
WHAT DOES THE VP44 OVERFLOW VALVE DO?
It regulates feed pressure entering the VP44. If pressure drops too low, the VP44 runs hot, loses lubrication, and can fail. The overflow valve keeps pressure stable and prevents fuel drain-back when the engine is off.
IS THIS OVERFLOW VALVE A GENUINE CUMMINS PART?
Yes — this is an authentic Cummins 3941156 overflow/check valve. Beware of off-brand versions with incorrect spring calibration.
DOES THIS FIX HARD STARTING OR LOW FUEL PRESSURE?
Yes. A weak overflow valve causes slow prime, stalling, and low lift pump pressure. Replacing it often restores stable supply pressure to the VP44.
SHOULD I REPLACE MY OVERFLOW VALVE WHEN INSTALLING A NEW VP44?
Absolutely. It is considered a mandatory replacement item when installing a new or reman VP44 pump to ensure proper pressure and pump longevity.
