Mercedes Mullins
The Case 1845C is a skid steer loader with a range of engine types. This equipment is known to have issues with its fuel lines, which can cause problems with starting the engine. To resolve these issues, it is important to understand the fuel system and the role of the lift pump. This article will provide a comprehensive guide on how to take off fuel lines on a Case 1845C, including troubleshooting common problems and step-by-step instructions for safe and effective maintenance.
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What You'll Learn
Check the shutoff solenoid
The shutoff solenoid on a Case 1845C uniloader is usually found on the top of the pump. However, in some cases, it may be located on the bottom side of the injection pump, where the fuel lines come off to go to the injectors. It is a small, one-wire solenoid with a spring and valve that can fall out when removed. To function, it requires battery voltage.
If your 1845C is not starting, there may be an issue with the shutoff solenoid. First, check if the solenoid is stuck open by removing the wire and attempting to start the engine. If the engine runs with the wire disconnected, the solenoid is likely stuck open.
Additionally, if there is a mess of wiring, a 12v feed may be shorted to the shutoff solenoid, causing it to remain open. In this case, you should use the mechanical fuel shut-off lever on the injection pump as an alternative to shut it down. You can also check if the solenoid is drawing current by using a digital VOM.
If your 1845C stalls and then won't start for approximately 20 minutes, the issue could be related to an electrical continuity problem. To address this, clean and tighten all grounds, check the connectors, and move and wiggle the wiring, especially the wire connected to the electrical fuel shut-off solenoid.
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Check the overflow on the discharge of the pump
If you are experiencing issues with your Case 1845C, it may be worth checking the overflow on the discharge of the pump before condemning the pump. This is especially true if it is an inline pump. The overflow is the hollow banjo bolt on the discharge line. There is a pressure relief built into the bolt, and the springs can become weak, causing the fuel to bleed back to the lift pump instead of going to the injectors.
To check the overflow on the discharge of the pump, start by locating the overflow valve. This is usually found in the discharge pipe, around the area where the pipe comes out of the pump housing. Once you have located the overflow valve, inspect it for any signs of debris or buildup. If the overflow valve is dirty or blocked, carefully clear it out with a thin, strong wire.
In addition to checking the overflow valve, it is also important to inspect the discharge line for any clogs or blockages. Over time, the discharge line can become clogged with dirt or debris, leading to potential overflow situations. To unblock the line, you can try using a plumber's snake. Make sure the terminus outside the house is clear of any leaves or debris.
If you are unable to clear the clog or blockage in the discharge line, it may be necessary to call a licensed plumber to clean or replace the line. If the pump is more than 10 or 15 years old, consider replacing the entire unit. Routine pump inspection and maintenance can help prevent overflow issues and ensure the proper functioning of your Case 1845C equipment.
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Check the fuel system to the lift pump
To check the fuel system to the lift pump, you will need to perform a series of tests to identify the issue. Here is a step-by-step guide:
Firstly, check the voltage at the pump. Ensure that power is reaching the pump by checking the voltage. If there is no power, the issue may lie with the fuel pump relay circuit or a blown fuse. Refer to your vehicle's service manual to locate the correct points for voltage testing.
Next, perform an electrical test using a voltmeter. Check the power wire for full voltage and ensure the grounding wire is properly grounded. If there is a difference of more than one volt, you may have corroded wires or issues with the circuit.
Now, we can move on to checking the fuel lines and filters. Disconnect the line from the lift pump to the injectors. Turn the engine over to check if fuel is reaching the injector pump. If fuel is not reaching the injectors, there may be a blockage or leak in the fuel line.
If the above steps do not identify the issue, you may need to perform a pressure test. Install a fuel pressure gauge to check the lift pump pressure. Ensure that the pressure is within the acceptable range, typically a minimum of 5 psi, with 8 to 12 psi being preferred.
If the pressure is below the minimum, the lift pump may be failing or has failed. Additionally, check for any signs of wear or damage on the cam and operating lever, linkages, pins, and diaphragms.
It is important to note that some pumps are sealed and cannot be repaired. Always refer to your vehicle's service manual for specific instructions and safety precautions when performing any fuel system checks or repairs.
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Check the shutoff switch
If you are experiencing issues with your Case 1845C skid steer, it may be necessary to check the shutoff switch. This is a common issue with this model, and there are a few things you can do to troubleshoot and resolve the problem.
First, it is important to understand the function of the fuel shutoff solenoid. This component is responsible for controlling the flow of fuel to the engine, and it is located on the injection pump. Over time, the solenoid can become stuck or faulty, leading to issues with starting and stalling the engine.
One way to check if the shutoff switch is functioning properly is to inspect the wiring. Ensure that all connections are secure and that there are no signs of damage or corrosion. If the wiring behind the gauges has been tampered with or is in disarray, it could be causing a short that prevents the shutoff solenoid from functioning properly.
Additionally, you can try to locate the shutoff solenoid and inspect it for any signs of damage or malfunction. On the Case 1845C, the shutoff solenoid is typically found on the bottom side of the injection pump, near where the fuel lines connect to the injectors. It is a small, one-wire solenoid with a spring and valve inside. If this solenoid is stuck open, it could be preventing the engine from shutting down properly.
In some cases, you may need to replace the fuel shutoff solenoid or the relays that control it. This is especially true if you find that the solenoid is damaged or if the issue persists after checking the wiring. A faulty shutoff solenoid can cause the engine to stall and may require replacement.
Finally, if you are experiencing issues with the engine not receiving fuel, there are a few additional steps you can take. First, check the fuel system to the lift pump by disconnecting the line from the lift pump to the injectors and turning the engine over. This will help establish that the tank pickup, lines, and lift pump are functioning correctly. If this does not resolve the issue, you may need to bleed the injectors or consult a diesel mechanic for further diagnostics.
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Check the fuel pressure
To check the fuel pressure of your Case 1845C, you will need to establish whether the fuel system to the lift pump is in good condition. To do this, turn off the engine and disconnect the line from the lift pump to the injectors. Then, turn the engine over to establish that the tank pickup and lines from the tank are in good condition and to confirm that the lift pump is able to send fuel to the injector pump.
If you are still unsure, you can use a fuel pressure tester. This is a simple design that consists of a gauge attached to a fuel hose and multiple fittings. The various fittings can connect to the fuel system of nearly any vehicle. When connected and the fuel system is pressurised, the tester will display the pressure in psi on a large gauge, allowing you to verify the fuel pressure.
Before you cut into the fuel line, it is recommended that you watch a few videos on using a fuel pressure tester and put a vacuum gauge on the line. This will tell you if you have jumped time. You can also add at least two gallons of fuel to the tank and try to start the engine. If it fires up, check the fuel gauge for internal failure and replace it if necessary. If the new gauge still shows a high fuel level, the issue is likely a failed fuel sending unit in the gas tank.
If you are still unable to determine the issue, you can try to verify that the fuel pump works. To do this, head to the fuel tank and have an assistant turn the ignition switch to "On". Listen for a two-second whir, hum, or series of rapid clicks as the fuel pump pressurises the fuel line to the engine. If there is no noise, this means that the pump is not getting power or has failed. In this case, you should check the fuel pump fuse and relay. If both are good, check the wiring to the pump. If voltage is present when turned to "On", then the pump has failed.
Finally, if you have an older throttle-body injected system, your vehicle may need as little as 10 psi to function. On the other hand, multi-port injection can see as high as 60 psi. Even the same vehicle can vary, so be sure to check your manufacturer's specifications.
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