Fuel Pumps For Cummins Marine & Industrial Engines

Introduction: Reliable Fuel Delivery for Peak Cummins Engine Performance

When it comes to powering heavy-duty equipment and marine vessels, Cummins engines are known for their strength, longevity, and rugged dependability. Whether your Cummins engine is running on a commercial fishing boat, a tugboat, or in a power generator at a remote industrial site, fuel delivery is everything. A dependable fuel pump ensures that your engine runs smoothly, starts reliably, and maintains fuel pressure under demanding loads.

At Diesel Pro Power, we specialize in mechanical lift pumps and fuel transfer pumps for a wide range of Cummins diesel engines. We stock high-quality aftermarket replacement parts that are often more durable than OEM options — and we include matching gaskets and seals for a complete repair solution.

What Is a Mechanical Lift Pump?

A mechanical lift pump is a low-pressure fuel pump typically mounted on the engine block. Its job is to draw fuel from the tank and supply it to the injection system at the correct pressure.

Key Functions:

• Draws diesel fuel from the tank

• Maintains consistent low-pressure flow to the engine

• Supports starting and idle operation

• Prevents vapor lock and fuel starvation

Unlike electric pumps, mechanical pumps rely on engine camshaft rotation to operate. They're rugged, reliable, and perfectly suited to Cummins marine and industrial applications.

What Is a Fuel Transfer Pump?

A fuel transfer pump moves fuel either:

• From tank to engine (in systems with remote tanks)

• Between tanks (e.g., saddle tanks)

• As a pre-supply pump before the mechanical lift pump

Transfer pumps are commonly used in:

• Marine engine rooms

• Commercial fuel systems

• Generator applications

• Auxiliary fuel setups

We offer Cummins-compatible transfer pumps engineered for constant duty in harsh environments. Many of our pumps are suitable for both diesel and biodiesel blends, ensuring flexibility for modern fuel systems.

Common Signs of Fuel Pump Failure in Cummins Engines

A faulty lift pump or transfer pump can cripple your entire fuel system. Look out for these warning signs:

Hard Starting or No Start

The engine may crank but fail to fire due to a lack of fuel pressure.

Engine Stalling or Hesitation

Especially under load or acceleration, poor fuel flow can cause the engine to stall or lag.

Fuel Leaks at Pump or Mount

Check for wetness around the pump body or fuel lines. Failed gaskets are common and require replacement.

Loss of Power

Inconsistent or low fuel delivery affects power output. This is especially dangerous during marine operations.

Excessive Pump Noise or Vibration

Transfer pumps that whine or buzz loudly may be failing or sucking air.

Diagnostic Codes (For Newer Models)

Modern Cummins ECMs may detect fuel pressure irregularities and throw codes.

Cummins Marine & Industrial Fuel Pumps by Engine Model

At Diesel Pro Power, we simplify fuel pump shopping by listing every part by engine model — no confusing part numbers required. Below is a breakdown of our most popular Cummins engine families and the mechanical lift pumps and fuel transfer pumps we support.

Fuel Pumps For Cummins 4B, 4BT, 4BTA

• Applications: Small vessels, generators, light industrial equipment

• Fuel Pump Options:

• Mechanical lift pump with lever priming handle

• Fuel transfer pump for auxiliary systems

• Includes:

• Mounting gaskets

• Return port sealing washers

• Maintenance Tip: Replace both pump and gasket to prevent vacuum leaks.

Fuel Pumps For Cummins 6B, 6BT, 6BTA (5.9)

• Applications: Pickup trucks, marine vessels, gensets

• Fuel Pump Options:

• Lift pump with diaphragm and manual primer

• Diesel transfer pump with threaded inlets

• Failure Note: If the 6BT loses power under throttle, suspect a weak lift pump.

• Kit Includes:

• Pump

• Gasket

• Optional fuel line kit

Fuel Pumps For Cummins ISB & QSB Series (5.9 & 6.7)

• Applications: Marine propulsion, industrial forklifts, equipment

• Lift Pump Specs:

• High-flow mechanical

• Bolt-on compatibility with common rail systems

• Gasket Kit:

• Replaces OEM seals

• Helps ensure proper vacuum pull

• Cross-reference: Contact us for serial number validation

Fuel Pumps For Cummins C Series (6C, 6CT, 6CTA 8.3)

• Applications: Tugboats, trawlers, commercial marine

• Fuel Pumps:

• Mechanical lift pump for 8.3L inline 6-cylinder

• Available with or without primer lever

• Gaskets Included:

• Flange gasket

• Copper washers for fittings

• Pro Tip: Always replace the mounting gasket when servicing the pump.

Fuel Pumps For Cummins ISC & QSC 8.3

• Applications: Marine propulsion, fire pumps, auxiliary power units

• Pump Options:

• High-durability mechanical lift pump

• Premium aftermarket transfer pump

• Available For:

• CPL-verified configurations (contact us for help)

• Compatible With:

• Diesel fuel and B20 blends

Fuel Pumps For Cummins L10, ISL & QSL

• Applications: Medium-duty trucks, generators, vessels

• Pump Options:

• Mechanical fuel lift pumps with plunger style

• Transfer pumps rated for high duty cycles

• Service Notes:

• Always inspect mounting flange for warping

• Check for pressure at key-on and idle

Fuel Pumps For Cummins M11, ISM & QSM11

• Applications: Towboats, fireboats, industrial cranes

• Pump Style:

• Heavy-duty lift pump, cam-actuated

• Engine-mounted transfer pump available

• Failure Symptom:

• Poor idle or air in fuel lines — caused by gasket leak or failed diaphragm

• Kit Includes:

• Replacement fuel pump

• Mounting gasket

• Inline strainer optional

Fuel Pumps For Cummins N Series, NH855, NT855

• Applications: Workboats, dredgers, oil rigs, locomotives

• Fuel Pump Details:

• Cast-metal lift pump

• Marine grade fuel transfer pump

• Gasket Notes:

• Use new sealing washers for every install

• Pro Tip: Don’t reuse copper washers — always replace them to prevent leaks.

Fuel Pumps For Cummins N14

• Applications: High-torque marine, industrial haulage

• Common Pump Failures:

• Hard start when hot

• Fuel bleed-back to tank

• Lift Pump Features:

• Steel body, integrated hand primer

• Threaded input/output for hose adaptability

• Includes:

• Gasket

• Banjo washers (if needed)

Fuel Pumps For Cummins K Series (KTA19, KTA38, KTA50)

• Applications: Marine propulsion, ferries, bulk carriers

• Fuel Pumps Available:

• Mechanical fuel lift pumps

• Pre-supply transfer pumps

• Gasket Kit:

• Large surface area gaskets

• Includes metal shims (if applicable)

• Marine Note: K-series engines often operate in pairs — replace both pumps simultaneously for balance.

Fuel Pumps For Cummins QSK Series (QSK19)

• Applications: Ultra-heavy marine, mining, oil & gas

• Fuel Pump Configuration:

• Custom-fit mechanical lift pumps

• Engine-mounted transfer pump kits

• Marine-Grade Coating: Resists corrosion in saltwater environments

• Service Tip: Inspect banjo fittings and lines for signs of oxidation.

Why Buy Fuel Pumps from Diesel Pro Power?

We don’t just stock Cummins-compatible pumps — we simplify the entire repair and replacement process. Here’s why mechanics, fleet managers, and marine engineers choose Diesel Pro:

No Serial Number Guessing

Our site is engine-model specific — so you can shop without needing long CPL codes or serial numbers. If a serial number is needed, our staff can help you decode it.

All-Inclusive Kits

Most pump listings come with gaskets and seals included — no separate checkout required.

Worldwide Shipping in 24 Hours

No matter your location — Florida, Chile, Singapore, or the Caribbean — we ship worldwide in 24 hours or less from our own warehouse.

Premium Aftermarket Quality

We only stock brand-new parts. No rebuilt, no surplus, no refurbished junk. Our aftermarket parts are tested for durability and backed by warranty.

Human Customer Support

Call, chat, or email — we’re here to help you find the right part the first time.

Frequently Asked Questions (FAQs)

1. Do you offer both mechanical lift pumps and electric pumps?
We only offer mechanical lift pumps and fuel transfer pumps. We do not stock injection pumps or high-pressure electric fuel pumps.

2. Do your lift pumps include gaskets and mounting hardware?
Yes — nearly every fuel pump comes with mounting gasket(s), washers, and seals required for installation.

3. How do I know if my Cummins fuel pump is failing?
Common symptoms include:

• Long cranking before start

• Fuel leaks at the pump

• Engine losing power under load

• Air bubbles in fuel return line

4. How fast do fuel pumps for Cummins engines ship?

All pumps are in stock so they ship within 24 hours. 

5. Can I replace the gasket without changing the pump?
Yes, but it’s not recommended if the pump is older than 2 years or shows signs of wear.

6. How do I find the correct fuel pump if my engine has been repowered or modified?
Use your engine’s serial number or call our support team for guidance.

7. Do you sell Cummins fuel lines and fittings?
Yes — we offer fuel lines, clamps, and banjo fittings to complete your installation.

8. Do I need a hand primer on my fuel pump?
Hand primers are optional but highly recommended for marine applications to assist with bleeding and pre-priming.

9. Can I use the same pump for marine and industrial engines?
Often yes, but be aware of corrosion resistance requirements in marine environments. We offer marine-grade pumpswhen applicable.

10. Are these pumps covered by warranty?
Yes — every pump is backed by our one-year comprehensive warranty.