If your Cummins engine is having issues starting or running, it could be due to a failing lift pump. The lift pump is responsible for supplying fuel to the injectors, and if it fails, the engine will either not start or will run very poorly. There are several Cummins lift pump failure symptoms, and it’s important to know what to look for so you can get your engine fixed before it causes more damage.
1) Engine Will Not Start
One common symptom of a failing lift pump is that the engine will not start at all. If the pump fails, there simply won’t be enough fuel available to ignite and start the engine.
2) Engine Will Start For a Short While
Another common symptom is that the engine will start but then stall shortly after. This is because the lift pump is not providing enough fuel to keep the engine running.
2) Poor Engine Performance
If the lift pump is only partially failing, you may notice that the engine is running poorly. It may have low power and torque, and it may be difficult to keep the engine running at high speeds.
4) Low Fuel Pressure
If you’re experiencing any of the symptoms above, it’s important to check the fuel pressure. Low pressure can be a sign that the lift pump is not working properly.
5) Clogged Fuel Filter
A clogged fuel filter can also be a sign of a failing lift pump. When the pump can’t deliver enough fuel, the filter can become clogged and prevent the engine from running properly.
If you’re experiencing any of these symptoms, it’s important to have your lift pump checked out by a qualified technician. Failing to do so could cause further damage to your engine.
How to Resolve These Issues?
If you have a Cummins lift pump that is not working properly, there are a few things you can do to try and resolve the issue.
1) Replace the Fuel Filter
If your fuel filter is clogged, it may be restricting fuel flow to the engine. Replacing the filter can help improve fuel pressure and flow, and may resolve the issue.
2) Clean the Fuel Tank
If your fuel tank is dirty, it can cause the fuel to become contaminated. This can clog the fuel filter and reduce fuel pressure. Cleaning the tank can help improve fuel quality and flow.
3) Check the Lift Pump
If you suspect that the lift pump is the issue, it’s important to have it checked out by a qualified technician. They can test the pump to see if it’s working properly and make repairs as necessary.
4) Replace the Lift Pump
If the lift pump is not working properly, it may need to be replaced. This is a fairly simple repair that can be done by a qualified technician.
5) Perform Regular Maintenance
One of the best ways to prevent lift pump failure is to perform regular maintenance on your engine. This includes changing the oil and filter, checking the fuel system for leaks, and more.
How Do I Know If My Lift Pump Is Going Bad?
The best way to know if your lift pump is going bad is to have it checked out by a qualified technician. They can test the pump to see if it’s working properly and make repairs as necessary. However, there are a few things you can look for to help determine if the pump is failing:
- Check the Fuel Pressure
- Listen for Strange Noises
- Look for Leaks
- Check the Engine Performance
- Check the Fuel Filter
How Do You Diagnose a Bad Lift Pump on a 5.9 Cummins?
You should take your 5.9 Cummins to a qualified technician to have it diagnosed. They will be able to test the lift pump to see if it’s working properly and make repairs as necessary.
What to Do If You Experience 6.7 Cummins Lift Pump Failure Symptoms?
If you’re experiencing any of the symptoms of a bad lift pump on a 6.7 Cummins, it’s important to have it checked out by a qualified technician.
How Much Does It Cost to Replace a Lift Pump on a 5.9 Cummins?
The cost of replacing a lift pump on a 5.9 Cummins will vary depending on the type of pump you need and the labor costs. However, it’s typically a fairly simple repair that can be done by a qualified technician.
FAQs:
Q: What are Cummins lift pump failure symptoms?
A: Symptoms of a bad lift pump can include low engine power and torque, difficulty running the engine at high speeds, low fuel pressure, a clogged fuel filter, and more.
Q: What should I do if I experience these symptoms?
A: If you’re experiencing any of the symptoms of a bad lift pump, it’s important to have it checked out by a qualified technician. They can test the pump to see if it’s working properly and make repairs as necessary.
Q: How do I know if my lift pump is going bad?
A: The best way to know if your lift pump is going bad is to have it checked out by a qualified technician.
Q: How do you diagnose a bad lift pump on a 5.9 Cummins?
A: You should take your 5.9 Cummins to a qualified technician to have it diagnosed. They will be able to test the lift pump to see if it’s working properly and make repairs as necessary.
Q: What are the symptoms of a bad lift pump on a diesel?
A: The symptoms of a bad lift pump on diesel can include low fuel pressure, loss of power, and stalling.
Q: Will diesel run with a bad lift pump?
A: No, diesel will not run with a bad lift pump. If the lift pump is not working properly, it can cause the engine to stall.
Q: How much does it cost to replace a lift pump on a 5.9 Cummins?
A: The cost of replacing a lift pump on a 5.9 Cummins will vary depending on the type of pump you need and the labor costs.
Verdict:
If you’re experiencing any of the above symptoms, it’s important to have your lift pump checked out by a qualified technician. Failing to do so could cause further damage to your engine. Regular maintenance is also important to help prevent lift pump failure.
