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How long do injectors last on a 6.7 Cummins?

Author

Chloe Ramirez

Updated on March 10, 2026

How long do injectors last on a 6.7 Cummins?

When serviced properly, the engine should last 500,000 to a million miles between teardowns. Peripherals like the turbocharger, fuel injectors and the fuel pump, however, can wear out or fail much earlier. A well maintained fuel system can keep injectors going for 250,000 miles or more.

Considering this, how much does it cost to replace injectors on a 6.7 Cummins?

The average cost for a Fuel Injector Replacement is between $262 and $354 but can vary from car to car.

Additionally, how many miles do diesel fuel injectors last? Diesel fuel injectors generally have a shorter lifespan than their predecessors, meaning they need to be replaced more frequently for optimal performance. The life expectancy of a good quality diesel fuel injector is around 150,000 kilometres.

In this regard, how do I know if my 6.7 Cummins has a bad injector?

A few signs that your injector is going bad include:

  1. Poor engine performance or misfires.
  2. A check engine light comes on.
  3. Hard starting or poor idle – especially after the vehicle has been sitting overnight.
  4. Black smoke from tailpipes.
  5. Foul odor from tailpipes.
  6. You notice a decrease in fuel efficiency.

How many miles will a 6.7 Cummins last?

350,000 miles

How do you test a 6.7 Cummins injector?

How to Test 6.7 Cummins Injectors
  1. Step 1: Open the Front Hood of the Engine. Open the front hood of the engine and find out the injector rails.
  2. Step 2: Take a Long Rod. Now, take any long rod type metal.
  3. Step 3: Put the Screw on the injector & Hear Sounds.
  4. Step 1: Set the Meter.
  5. Step 2: Connect the Cables.
  6. Step 3: Check the Resistance Reading.

How do you check a Cummins injector?

Cummins recommends a simple visual test to start. First remove the valve cover, then crank the engine and let it idle. With a light, study the injector body of each cylinder. Sometimes, if the injector body is cracked externally, you may be able to notice a small wisp of smoke from the injector.

How do I know if my 5.9 Cummins has bad injectors?

What are the symptoms of a bad injector pump? Symptoms of a bad injector pump on a Dodge Cummins 5.9L engine include a hard start, no start, or low power.

How do you remove the injectors from a 24 valve Cummins?

To remove the injector use an injector removal tool or an 8 x 1.50 mm bolt. Screw the bolt into injector top gently. Use a pry bar to gently apply upward force on the bolt until the injector "pops" out. Make sure your copper washer is still on the injector when you pull it out.

How much does it cost to get a 5.9 Cummins rebuild?

To properly rebuild a 5.9L diesel or to purchase a rebuilt long block you are looking at a lot of money. Parts and labor would be well over $10,000.

What are the symptoms of a bad diesel fuel injector?

Here are the 5 most common symptoms of faulty diesel fuel injectors.
  • Trouble starting the vehicle or uneven idling. The engine cranks but doesn't start unless you crank it for a long time.
  • Misfire.
  • Smell of fuel.
  • Dirty emissions.
  • Increased fuel consumption and poor miles per gallon.

Can you drive a diesel with a bad injector?

Left too long, a faulty fuel injector can cause serious engine damage that requires major repair. Avoid the cost and hassle by using Rislone Gasoline Fuel System Treatment or Diesel Fuel System Treatment every 3,000 to 5,000 miles, depending on the type of driving you do.

How do I keep my diesel injectors clean?

How to Clean Diesel Injectors
  1. Purchase a fuel additive.
  2. Start the car, and allow the engine to warm up for three or four minutes.
  3. Remove and drain the fuel filter.
  4. Fill the entire filter and housing cavity with your chosen fuel additive.
  5. Install a new fuel filter for your diesel vehicle.

Why does my diesel truck take so long to start?

It's the middle of summer and your diesel engine is having trouble getting started. The problems that can occur due to the cold weather are well-known and fairly common, such as using summer-grade fuel in winter, a bad glow plug system, slow cranking, or thick, cold oil.

Can you use too much diesel injector cleaner?

Not a problem. The recommended dose is the minimum to be effective, not the maximum to prevent damage. Read the label - they tell you to use two bottles for larger fuel tanks. Pro mechanics actually run Techron through engines straight to clean injectors quickly.

What years are common rail Cummins?

Common-rail injection debuted on the Dodge Cummins 5.9L for model year 2003, rated at 305 hp. The mid-2004 models marked the introduction of the updated 5.9L engine which is rated at 325 hp. These engines use different injectors (see below).

How do you change the injectors on a 6.7 Cummins?

How to Replace an Injector in the Cummins 6.7L Engine
  1. Disconnect the batteries.
  2. Using a 11mm socket remove the clamps on the egr cross over.
  3. Then remove the egr cross over tube.
  4. Remove the boost tube from the intake plenum.
  5. Now, with a 8mm socket, remove the top cover on the engine to gain access to the front valve cover bolts.

What causes low fuel rail pressure Cummins?

Most starting problems due to low pressure are caused by bad (eroded check ball seat) injectors. You can unplug the fuel control actuator and the pressure should default to maximum (26,107 PSI), however if there is a leak in the injection system then the pump will not build enough pressure.

How much does it cost to replace diesel injectors?

Depending on the make and model of your car, the average fuel injector replacement cost will run you about $800 to $1,450 for a full replacement. If you have the knowledge to do the replacement yourself, the parts alone are around $600 to $1200, while the labor cost is only about $200 to $250.

What does a bad diesel injector sound like?

A bad injector can sound exactly like a rod knock. One that completly fails and squirts all it's fuel all at once will scare the daylights out of you it's so loud. You'll think it's going to crack the block!

What causes diesel injectors to go bad?

Diesel injectors fail because of two main reasons. The first has to do with the mechanical soundness of the injector structure, and the second has to do with the quality of the fuel running through the injector. Aggressive tuning and debris in the fuel is usually the culprit.

What year Hilux has injector problems?

The first and most common repair request is for fuel injector replacement. This problem affected the early editions of the 3-litre diesel engine built before August 2007 and there have been a number of updated injectors released - both from Toyota as well as aftermarket companies.

How do I know if my fuel injectors are clogged?

Symptoms of a clogged fuel injector:
  1. Engine runs very rough.
  2. One, multiple or all the cylinders are not firing.
  3. The engine does not make power.
  4. Engine does not want to start.
  5. Bad emissions.
  6. Bad Fuel Consumption.

Why are diesel injectors so expensive?

In order to move diesel fuel and withstand the high pressure of combustion, diesel injectors need to be much more robust. Naturally, the more complex and beefy design requirements make diesel injectors more expensive. Unlike gasoline injectors operating under lower tolerance.

Can you replace one diesel injector?

When it comes to your diesel fuel injection system, a single injector is often the cause of an entire engine failure. Often, one little problem in your diesel engine may be indicative of other system failures. This is why it is often best to replace multiple injectors at once.

What's the best injector cleaner for a diesel?

Comparison of best fuel injector cleaners
BrandPrice
Best overall fuel injector cleanerChevron$4.49
Best fuel injector cleaner for diesel enginesLucas$3.97, $9.99, $26
Best fuel injector cleaner for high-mileage cars/engines/vehiclesGumout$4.94
Best fuel injector cleaner for direct-injection cars/enginesRoyal Purple$7.49

Can you clean diesel fuel injectors?

If you're not up to taking the injectors apart by hand, you can try periodic fuel injector cleaner applications, which clean the injectors through the addition of concentrated detergent packages delivered through the fuel. One thing to keep in mind, though, is that sometimes the injectors are not dirty, they are worn.

What is high mileage for a Cummins diesel?

In fact, Cummins Turbo Diesel has a High Mileage Club for owners that have gone over 100,000 miles. For those looking for the right call when picking a heavy-duty, consider the success and longevity that comes with a Cummins engine in a Ram.

Should I delete my 6.7 Cummins?

Should I Delete My 6.7L Cummins? To put it bluntly, no, you should not remove the emissions equipment from any diesel pickup. Removing emissions equipment also voids the vehicle's factory warranty. And before you say it, there is no way to keep a dealer from knowing that emissions equipment was removed.

How many gallons of oil does a 6.7 Cummins take?

2007 - 2017 Ram 2500/3500, 6.7L Cummins Fluid Specs & Capacities
Engine oil2007.5 - 201812 qts oil capacity w/ oil filter change
2019
Engine cooling system2007.5 - 2012~ 5.7 gallons
2013 - 2019
Automatic transmission fluid68RFE 6 spd auto17.5 qts total capacity ~ 5.5 - 6.5 qts service refill

How many miles is too many for a Cummins?

Dodge states that the Cummins is good for 350,000 miles before major overhaul.

How reliable is the 6.7 Cummins?

If you use a 6.7 cummins like a truck (towing, etc.) you should get many trouble free miles out of it bone stock. Eventually you will have trouble with the emissions equipment, but likely not until or after the 100k mile mark.

What oil does a 6.7 Cummins take?

Mobil 1 122094 5W-40 — Best Engine Oil For 6.7 Cummins.

What is the fuel mileage for a Dodge Ram 2500 Diesel?

15.7 miles per gallon

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