Ameer Randolph
Resetting the fuel pump shut-off switch on a 99 Cat Diesel is a simple but crucial procedure that can prevent major inconveniences on the road. The fuel pump shut-off switch is a safety feature that automatically cuts off the fuel supply in the event of a collision or rollover. This switch is typically located in the trunk, under the hood, or near the driver's seat, and can usually be identified by a red button or a cover over the shut-off. Resetting it can restore fuel flow and get your vehicle running smoothly again.
How to reset fuel pump computer on 99 cat diesel
| Characteristics | Values |
|---|---|
| Vehicle | 99 dodge ram 2500 diesel |
| Problem | No voltage to fuel pump |
| Solution | Check for a separate relay on its own harness if the vehicle has a Mopar in-tank conversion |
| If not, the relay is bad, missing a power feed, there is a wiring issue, or the engine controller isn't awake | |
| Fuel pump shut-off switch | Typically located in the trunk, under the hood, or near the driver's seat |
| Reset procedure | Turn the key off, turn the key to crank, turn the key off, turn the key to on |
| Open the front passenger door and locate the shut-off switch on the side of the dash | |
| Remove the cover and press down on the top of the switch to reset | |
| Turn the ignition key to the "On" position and wait for the fuel pump to prime | |
| Start the engine |
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What You'll Learn
Resetting the fuel pump shut-off switch
The fuel pump shut-off switch is typically located in the trunk, under the hood, or near the driver’s seat. Specifically, it can be found on the passenger side of the engine compartment, near the firewall. It may be covered by a rubber cap, or a small cover on the side of the dash, which can be removed to access the switch.
Most fuel pump shut-off switches have a red button that needs to be pressed to reset. Simply locate the button and push it firmly. After pressing the reset button, turn the ignition key to the “On” position for a few seconds without starting the engine. This will allow the fuel pump to prime. Now, try starting the engine. If the fuel pump shut-off switch was the problem, the engine should start normally.
Once the engine is running, it is important to check for any fuel leaks around the fuel pump or fuel lines. If you notice any leaks, have them repaired immediately.
It is recommended to always consult your vehicle’s owner’s manual or a qualified mechanic for specific instructions and safety precautions.
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Locating the fuel pump shut-off switch
The fuel pump shut-off switch is a safety feature that prevents fuel from being pumped in the event of a car accident. It is analogous to an electric fuse but for fuel. Many vehicles have them, but they can be difficult to locate.
The fuel pump shut-off switch is usually located either under the dash in the driver compartment or under the driver or passenger seat. To access the switch, you will need to move the seat forward and pull back on the carpet or pop off the cover under the seat.
On some vehicles, the fuel pump shut-off switch may be located in one of the following places:
- Behind or below the glove compartment, sometimes hidden under the carpet
- Under the side-panel located next to the driver's door
- On the driver's side, between the footrest area and door, sometimes hidden under the carpet
- On the passenger side, behind the passenger footwell cover
- On the right side of the luggage compartment, behind an access panel
- Near the liftgate, behind an access panel in the right rear quarter trim panel
The fuel pump shut-off switch has a red reset button on top of it. Once you have located the switch, you can reset it by pushing the button or pulling the lever down.
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Troubleshooting low voltage
If you are experiencing low voltage in your 99 CAT diesel fuel pump, there are several troubleshooting steps you can take to identify and resolve the issue.
Firstly, check if there is any power at the pump. If there is no power, trace back to the relay and fuses. Verify that the relay is operational and inspect all connections for any signs of corrosion or loose wires. Consider testing the pump directly by bypassing the relay to determine if it is receiving power.
If the relay is functional and the vehicle can be jump-started, the issue may be related to low battery voltage, which could have prevented the pump from activating. In this case, check the voltage at different points along the circuit, starting from the fuse box to the pump, to identify where the voltage drop is occurring. A weak battery can cause a voltage drop, affecting components such as the fuel pump, resulting in insufficient power to function properly.
Additionally, examine the wiring for any signs of wear, corrosion, or loose connections. If there are any issues with the wiring, repairing or replacing the damaged wires should help restore proper voltage to the fuses.
If you have an in-tank conversion, there will be a separate relay on its own harness. This harness will plug into the original transfer pump connector and will include an inline fuse connected to the left battery. Ensure that all connections are secure and that there are no wiring issues before or after the relay.
By following these troubleshooting steps, you should be able to identify and address the low voltage issue in your 99 CAT diesel fuel pump.
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In-tank conversion
If you're performing an in-tank conversion on a 99 CAT diesel, there are a few important steps to follow. Firstly, if your vehicle previously had an in-tank conversion, ensure that the engine controller software is updated. This is crucial for the proper functioning of the fuel pump.
Secondly, if you're installing a new pump in the tank, it's essential to also install the accompanying wiring harness. The wiring harness for an in-tank pump differs from that of a block-mounted fuel pump, so purchasing the correct harness is important. This wiring harness will connect to the stock pump location and run the leads down to the tank.
Additionally, for a Mopar in-tank conversion, there will be a separate relay on its own harness. This harness will plug into the original transfer pump connector and will include a ground, an inline fuse connected to the left battery, and another wire that goes to the connector behind the left front wheel.
It's also important to note that if you're experiencing issues with your fuel pump, such as low voltage, it could be due to a faulty relay, a missing power feed, wiring issues, or an engine controller that isn't functioning properly.
When performing an in-tank conversion, it's always recommended to consult a certified mechanic or a dealer to ensure that the installation is done correctly and to avoid any potential issues.
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Checking for fuel leaks
Step 1: Inspect the Fuel Filter and Housing
Start by examining the fuel filter and its housing for any signs of leaks or damage. Ensure that the fuel filter is secure and properly seated in its housing. Non-OEM filters are more prone to leaks, so it is important to use filters that meet original equipment manufacturer (OEM) specifications.
Step 2: Re-prime the System
Before starting the engine, re-prime the fuel system. This step ensures that any air trapped in the system is removed, reducing the risk of air bubbles causing false or low pressure readings.
Step 3: Start the Engine and Observe
After re-priming, start the engine and carefully observe the fuel filter housing, drain valve, rubber hoses, and quick connections for any signs of air ingestion or leaks. Look for air bubbles in the fuel lines, as these can indicate a leak or an intake of air.
Step 4: Isolate Air Ingestion or Leak Sources
If air ingestion or leaks are suspected, use clear lines to isolate the source. Start from common air ingestion points, such as the filter housing, and work your way back toward the fuel tank until you no longer see air coming through the clear line.
Step 5: Pressurize the Fuel System
Another method to check for leaks is to pressurize the fuel system. This can be done by adding an air line to the fuel fill nozzle. It is recommended to pressurize the fuel tank to about 4-5 lbs and then inspect for any leaks. An old fuel cap fitted with a nipple and an air regulator can be used for this purpose.
Step 6: Check the Relief Valve
All Cat fuel transfer pumps have a relief valve that should stay closed at low engine speeds. However, at high engine speeds, the valve must open due to the high fuel pressure. If the valve gets stuck closed, it will lead to excessive fuel pressure, which can cause the fuel filter to leak.
Remember to refer to the service manual for your specific vehicle model and always exercise caution when working with diesel fuel systems.
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Frequently asked questions
The fuel pump shut-off switch is a safety feature that automatically cuts off the fuel supply in the event of a collision or rollover. To reset the switch, locate the button (usually red) and push it firmly. Then, turn the ignition key to the “On” position for a few seconds without starting the engine. Now, try starting the engine. If the engine starts, check for any fuel leaks around the fuel pump or fuel lines. If there are leaks, have them repaired immediately.
The fuel pump shut-off switch is typically located in the trunk, under the hood, or near the driver’s seat. More specifically, it is usually found on the passenger side of the engine compartment, near the firewall.
If there is no power at the pump after bumping the starter, the relay is likely bad, there is a missing power feed, there is a wiring issue, or the engine controller is not awake.
