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The X15 is a relatively new engine model, replacing the older ISX15 found on many trucks with Cummins engines. While the X15 is less than a decade old, it's seen enough miles for the most common problems to emerge. Unfortunately, although this engine is relatively reliable, these common issues include several potentially severe problems.
Chief among these issues is a faulty and occasionally unreliable fuel pump. These issues won't necessarily affect every Cummins X15, but they're common enough that the manufacturer has issued a recall for this specific problem. If you're concerned your truck may suffer from a fuel pump problem, here are the three signs you need to monitor.
1. Long Crank/Start Times
Extended start times are one of the most reliable indicators of an issue with your fuel system. Diesel engines rely on precise fuel delivery more so than gasoline engines. Precise fuel pressure is particularly important when you first start your truck. Any problem with the fuel system will tend to make your truck relatively difficult to start, and the fuel pump is no exception.
The fuel pump isn't the only possible cause of hard starting. Clogged fuel injectors, a dirty fuel filter, or another issue with the fuel system can cause similar symptoms. While there's a high likelihood that the pump is to blame on an X15, it's still important to have a diesel engine repair shop confirm and pinpoint the issue.
2. Weak Power Under Load
Another common symptom of a faulty pump on X15 engines is reduced power under load. This problem may be relatively inconsistent and seem to come and go, and it will typically be more noticeable when there's a heavy load on the engine. Pay attention to how your truck feels while on steep grades or operating at high RPMs.
As with cranking issues, a loss of power doesn't always point directly at the fuel pump, although fuel system issues are a likely culprit. Like any other combustion engine, diesel engines require air and fuel to operate, so issues with air intake are another possibility. However, if your truck isn't throwing any check engine lights, that points more strongly to a mechanical issue and a possible fuel pump failure.
3. Stalling
Perhaps the most severe symptom you'll experience with this issue is stalling. The particular failure mode for X15 engines means that the pump may stop working suddenly, cutting fuel pressure to the engine. As a result, the engine can stall, sometimes with little or no warning beforehand. If this happens on your truck, it's important not to ignore the issue or assume it was a one-off problem.
Stalling is arguably one of the more dangerous situations your truck will face, so it's best to have your rig towed to a qualified shop rather than risking the trip with it. Even if the fuel pump isn't to blame, it's crucial to locate and repair the problem as soon as possible to ensure your truck doesn't become a hazard to other motorists.
Share26 September 2022
