Cummins PT Fuel Pump Cover 3000446 | Fuel Control Cover For KTA38 & KTA50

 

This Cummins 3000446 Fuel Control Cover, also referenced as the PT pump top cover or fuel pump access plate, is a precision-machined component designed specifically for the Pressure-Time (PT) fuel system. Serving as a critical protective barrier for the fuel control unit, this genuine-spec cover shields internal metering components from contamination while maintaining system integrity in high-vibration environments. For workshops servicing heavy-duty Cummins KTA38, KTA50, and K19 series engines, the 3000446 cover ensures the fuel control mechanism remains sealed against dirt, moisture, and pressure fluctuations-a common failure point that leads to unstable idle or black smoke conditions. This component is not a universal gasket or aftermarket substitute; it is the factory-specified fuel control cover that directly interfaces with the PT(G) and PT(H) pump housings, preserving the original equipment manufacturer's clearance tolerances for the throttle shaft and governor linkage.

 

 

The Cummins 3000446 is a lightweight alloy cover weighing approximately 0.028 lbs and measuring 3.5 x 2.5 x 0.75 inches. It cross-references with 12262002 and 3070562 in certain listings, though 3000446 remains the primary OEM designation for the PT fuel pump assembly. The cover features corrosion-resistant construction with precisely aligned mounting holes that match the pump housing's threaded bosses, ensuring correct compression of the underlying O-ring seal. For repair shops, verifying the 3000446 Cummins marking guarantees compatibility with the fuel control unit housing, eliminating the risk of improper sealing that leads to prime loss or fuel aeration.

 

 

This fuel pump cover fits Cummins KTA38 and KTA50 engines used in mining haul trucks, marine vessels, oilfield pumps, and generator sets. It also covers certain NTA855 and K19 configurations with PT(G) style pump bodies. The cover protects the governor spring and throttle shaft assembly from debris that causes erratic speed control. Marine environments particularly benefit from this cover's corrosion resistance. For Cummins PT fuel system rebuilds, sourcing a genuine-spec cover maintains the internal clearances required for stable pressure regulation and reduced cold-start smoke.

 

 

Proper torque sequencing is essential when replacing the 3000446 fuel control cover. Clean the pump housing mating surface thoroughly to remove old gasket residue. Install with a new O-ring (sold separately) to prevent fuel weepage. Torque retaining screws evenly in a cross-pattern to 35–47 N·m to avoid warping. After installation, prime the PT fuel pump by loosening the vent screw until bubble-free fuel escapes, then tighten and check for leaks. Inspect the throttle shaft bushing for play during cover removal-if worn, the throttle shaft assembly may need simultaneous replacement to prevent governor instability.

 

 

While modern common rail systems dominate newer engines, the Cummins PT fuel system remains the backbone of thousands of pre-emissions industrial diesels still in active operation. The 3000446 cover represents a low-cost, high-impact maintenance component that directly influences fuel pump longevity and engine reliability. Approximately 80% of fuel supplied to PT injectors returns to the tank, carrying heat away from injector bodies-a cover that leaks or fails to seal allows air ingress, disrupting this cooling flow and potentially leading to injector tip overheating or premature wear. For repair facilities, stocking this fuel control cover addresses a frequent failure mode where original covers become pitted or corroded, allowing moisture to attack the governor plunger and metering valve. Unlike rebuilding an entire PT pump at significant cost, proactive replacement of the cover and its sealing elements during scheduled injector service preserves fuel pressure integrity and prevents erratic engine behavior. This part also adds value for shops performing in-frame overhauls on K-series engines, where replacing aged covers with fresh OEM-spec units signals thoroughness to customers and reduces hidden warranty exposures.

 

 

Q1: Does this 3000446 cover fit both PT(G) and PT(H) pump variants?
A: Yes, the 3000446 is dimensionally compatible with both PT(G) and PT(H) housings on KTA38 and KTA50 engines. Verify your pump's 4-bolt pattern for confirmation.

Q2: What O-ring is required for this cover?
A: A specific profile O-ring is needed for proper sealing. Consult your parts manual for the exact number; always replace the seal when the cover is removed.

Q3: Can this be used on marine or generator-set applications?
A: Yes, both applications are suitable. Marine environments require extra surface inspection for pitting before installation.

Q4: How to identify a counterfeit 3000446?
A: Genuine covers feature distinct casting marks and precise edge finishing. Purchase from authorized distributors with OEM-labeled packaging.

Q5: What symptoms indicate a failing cover?
A: Hard starting, loss of prime, fuel weeping around the pump top, or unstable idle after shutdown often point to a compromised cover or sealing surface.

 

 

To make your purchasing experience smooth and easy, we offer a variety of secure payment options:

We're here to make your order process worry-free - choose the payment method that works best for you!

 

 

Hot Tags: cummins pt fuel pump cover 3000446 | fuel control cover for kta38 & kta50, China cummins pt fuel pump cover 3000446 | fuel control cover for kta38 & kta50 manufacturers, suppliers, factory, 382 0709 injector, 4307217 injector, 4326959, 4902906, P4359206, P5461846