Fuel Pressure Issues In Can-Am 1000: Troubleshooting And Fixes

Fuel pressure is an important consideration for Can-Am vehicles, with some models like the Commander 1000x and the Outlander 1000 requiring a fuel pressure of around 50 PSI for optimal performance. However, there are variations and discrepancies in fuel pressure specifications, with some users reporting normal fuel pressure readings of 49 PSI or even as low as 30 PSI. This can be influenced by factors such as the age of the vehicle, the type of fuel system, and the quality of the fuel pump and regulator. Aftermarket fuel filters and gauges can also be installed to monitor and regulate fuel pressure.

Fuel pressure after first turning the key

Fuel pressure is an important aspect of the Can-Am Commander's performance, and it's essential to ensure that it is within the optimal range for the vehicle to function correctly. The fuel pressure should be between 40 and 50 lbs after the key is first turned, according to the manufacturer's specifications. However, it's worth noting that a healthy pump can provide even higher pressure, but the regulator will bypass the excess back to the tank to maintain the desired range.

If the fuel pressure is not within this range, it could indicate an issue with the fuel pump or regulator. In some cases, a faulty fuel pump or regulator can cause the fuel pressure to drop below 50 psi, leading to poor engine performance or even failure to run. Therefore, it is crucial to monitor fuel pressure and address any deviations from the recommended range promptly.

One way to troubleshoot fuel pressure issues is to check the pump and regulator. If the previous owner installed a new fuel pump, it's possible that the installation was not done correctly, leading to the current problems. It's also worth considering the quality of the replacement parts used. In some cases, aftermarket fuel pumps or regulators may not be up to the task and could be the source of the issue.

To resolve the problem, it may be necessary to replace the fuel pump or regulator with high-quality, OEM parts. Additionally, it's important to ensure that the regulator is set to the correct pressure. By taking these steps, you can help ensure that your Can-Am Commander maintains the proper fuel pressure and delivers the performance you expect.

Fuel pump assembly

The fuel pump assembly is the unit in a gas tank that sends fuel to the engine. It is made up of several components, each with a specific function in the fuel pumping system. The assembly ensures that clean, pressurised fuel reaches the fuel injectors.

The fuel pump assembly is usually located in the gas tank, submerged in the fuel. The main pumping component in the assembly is an electric motor that spins at high speed to an impeller, several valves, and a pressure regulator. The assembly also contains the main fuel filter. The unit pulls fuel from the tank and sends it into the fuel lines at high pressure.

The fuel pump assembly is made up of several parts, including a screen filter, a motor, and a pump. The screen filter is a simple mesh strainer that traps bigger debris. The sock filter sits at the bottom, attached to the inlet opening, pulling fuel into the motor. The pump consists of a small DC motor and an impeller to push fuel. Fuel pump motors can be pusher or puller types.

The fuel pressure regulator controls the amount of fuel that gets pumped through the fuel line. Accurate and consistent pressure is required at the fuel injection system. The regulator is essentially a valve that consists of a spring and diaphragm. When pressure is too high, the valve opens to let excess fuel flow back into the gas tank.

The fuel sending unit consists of a fuel sensor that sends a signal to light the dashboard light, and a float that controls the fuel level gauge.

A bad fuel pump assembly may give false fuel level readings, causing the vehicle to run on an empty gas tank. This can be damaging to the fuel filter and the fuel pump itself. Signs of a failing fuel pump assembly include low gas mileage, hard starting, whining fuel tank noise, loss of engine power, and sudden and erratic power surges.

To fix a fuel pump assembly, you will need to carry out a diagnosis to confirm the problem and identify any faulty parts. Failure can be caused by a worn or burnt-out pump motor, clogged filter, or bad electrical connections.

Fuel pressure when on the gas

Fuel pressure is an important aspect of your vehicle's performance and longevity. The correct fuel pressure helps your vehicle run efficiently, maximising both power and fuel economy.

The fuel pressure when on the gas, or effective pressure, is the pressure differential across the injector. This is the actual applied pressure for the injector. When an engine is idling, there is a vacuum in the intake manifold. This vacuum pulls fuel out of the injectors, increasing the effective pressure across the injector to a pressure higher than the rail pressure. When a vehicle is turbocharged and in boost, the pressure inside the manifold tries to push fuel back into the injector, resisting the flow and decreasing the effective fuel pressure below that of the rail pressure.

The ideal fuel pressure for a Can-Am Commander 1000x is between 40-50 lbs after first turning the key. However, some users have reported a healthy pump providing more pressure, with the regulator bypassing the excess back to the tank. The regulator is preset at 50 psi from the factory, but some pumps can reach 52 psi.

If your fuel pressure is too low, you may experience an unresponsive throttle, difficulty starting the car, a check engine light, misfires, or low performance. Low fuel pressure can cause damage to your engine and should be avoided.

Fuel pressure gauge readings

If you are unsure what your engine needs, check the manufacturer's specifications. If you are unable to find this information, a general rule of thumb is that most vehicles' fuel pressure ranges between 40 and 80 psi.

Zero fuel pressure means the pump is dead or not getting power. Low fuel pressure can cause a slow start-up, low performance, misfires, and stalling. High fuel pressure will cause excessive fuel consumption, black smoke from unburned gas, an overheating catalytic converter, and rough idle.

If your Can-Am Commander 1000X is showing a fuel pressure of 30 psi after the first turn of the key, and then bounces around 40 psi when idling, this could indicate a problem with the fuel pump. A healthy pump should provide more pressure, and the regulator will bypass back to the tank at the correct pressure.

Fuel pump replacement

Step 1: Park the vehicle and set the parking brake

It is important to ensure the vehicle is parked on a firm, level surface before beginning any work. Once parked, apply the parking brake to prevent accidental movement.

Step 2: Locate the fuel pump and test

On most vehicles, the fuel pump is located inside the fuel tank. To test it, open the fuel cap and turn the key to the "ON" position. Listen at the filler opening; a properly functioning fuel pump should produce a faint hum for two to three seconds. If no sound is heard, the pump may need to be replaced.

Step 3: Check the fuel pump fuse and relay

Before replacing the fuel pump, it is important to verify the condition of the fuse and relay. If the fuse is blown, replace it with one of the same amperage. If the fuse and relay are functional, proceed to the next step.

Step 4: Check for power and ground at the fuel pump

If the fuse and relay are intact, the next step is to check for power and ground at the fuel pump. This may require removing the fuel tank or rear seat for access. If there is power and ground at the pump, it is likely faulty and will need to be replaced.

Step 5: Relieve fuel system pressure and disconnect the battery

Before proceeding further, it is crucial to relieve the fuel system pressure. This can be done by running the engine and pulling the fuel pump relay, causing the engine to stall. Also, disconnect the negative battery cable for safety.

Step 6: Drain the fuel tank

To minimize the risk of spills, drain as much fuel as possible from the tank. Disconnect the filler tube hose and any electrical connections to the pump.

Step 7: Remove the fuel tank

Support the fuel tank with a jack and a block of wood. Remove any retaining straps or bolts holding the tank to the vehicle's frame, then carefully lower it.

Step 8: Disconnect the fuel lines and remove the old fuel pump

Disconnect all fuel lines and electrical connections from the pump. Take note of the wiring and fuel line connections for reassembly. Remove the old fuel pump from the tank.

Step 9: Install the new fuel pump

Compare the new fuel pump to the old one to ensure you have the correct part. Install the new pump, reconnecting all fuel lines and electrical connections.

Step 10: Reinstall the fuel tank and reconnect components

Lift the fuel tank back into position and secure it with the retaining strap. Reconnect the filler tube hose and electrical connector. Reconnect the negative battery cable.

Step 11: Refill the fuel tank and test

Fill the fuel tank with gasoline and conduct a road test to confirm that the new fuel pump is functioning properly.

Additional Tips:

• Work in a well-ventilated area to minimize the risk of fire and inhalation of fumes.
• Always wear safety gear, including gloves and eye protection, when handling fuel.
• Clean the area around the fuel pump before removal to prevent debris from falling into the tank.
• Consider replacing related components such as the fuel filter and fuel pump strainer.

Frequently asked questions