Geo Tracker Fuel Pump: Pressure And Performance

The fuel pump is a component of a car's engine that supplies pressurised gasoline to the fuel injectors. The pressure and output of the pump are controlled by a regulator. The fuel pump is usually located in the vehicle's gas tank and is powered by a compact electric motor. The fuel pump in a Geo Tracker can be replaced by removing it from the tank through an access panel above the tank in the passenger compartment. The fuel pump pressure for a 91 Geo Tracker with a 1.6L engine is between 34-41 psi. Walbro High Pressure 255LPH Fuel Pumps are available for the Chevrolet GEO - CHEVROLET TRACKER and are recommended for high-performance engines.

Fuel pump pressure specifications

The fuel pump is a component of a car's engine that supplies pressurised gasoline to each of the fuel injectors. The pressure and output of the pump are controlled by a regulator. The fuel pump is typically located in the vehicle's gas tank and is powered by a compact electric motor.

According to a user on an online forum, the fuel system pressure specifications for the 91 Geo Tracker are as follows:

• Engine idling: 240-280 kPa (34-41 psi)
• Key on, engine off: 240-280 kPa (34-41 psi)
• Key on, engine on: 172 kPa (25 psi)

It is important to note that fuel pump pressure specifications may vary depending on the specific model and year of the Geo Tracker. It is always recommended to consult a qualified mechanic or refer to the vehicle's service manual for accurate and model-specific information.

Additionally, when considering fuel pump replacement, it is important to ensure that the fuel filter is also replaced, as a clogged filter can restrict fuel flow and impact the overall performance of the fuel system.

Fuel pump replacement

The fuel pump in a Geo Tracker has a pressure of 34-41 psi. If you are looking to replace the fuel pump, here is a step-by-step guide:

Step 1: Park your vehicle

Park your vehicle on a firm, level surface and engage the parking brake.

Step 2: Locate the fuel pump

The fuel pump is typically located inside the fuel tank. To locate it, open the fuel cap and turn the key to the "ON" position. Listen at the filler opening—a properly functioning fuel pump will produce a faint hum for two to three seconds.

Step 3: Check the fuel pump fuse and relay

If the fuel pump is not operational, the next step is to check the fuel pump fuse and relay. If the fuse is blown, replace it with one of the same amperage.

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

If the fuse and relay are functional, the next step is to check for power and ground at the fuel pump. This may require removing the fuel tank or the back seat. If there is power and ground at the pump, then it is faulty and needs to be replaced.

Step 5: Prepare for fuel pump replacement

Before starting the replacement process, relieve the fuel system pressure and disconnect the negative battery cable. Siphon or drain as much fuel as possible from the fuel tank. It is important to work in a well-ventilated area and wear proper safety gear, including safety glasses, gloves, and appropriate clothing.

Step 6: Access the fuel pump

To access the fuel pump, you may need to remove the fuel tank from the vehicle. Use a jack to support the tank and remove any retaining straps or bolts holding it in place. Lower the tank carefully.

Step 7: Disconnect the fuel lines and remove the old fuel pump

Disconnect the fuel lines and electrical connections from the old fuel pump. Take note of the wiring and fuel line connections before removing the old pump.

Step 8: Install the new fuel pump

Compare the new fuel pump with the old one to ensure you have the correct part. Install the new fuel pump, reconnect the fuel lines and electrical connections, and secure the fuel tank back in place.

Step 9: Reassemble and test

Reassemble the fuel system, reconnect the negative battery cable, and fill the fuel tank. Conduct a road test to confirm that the new fuel pump is functioning properly.

Fuel pump testing

Testing fuel pump pressure is a straightforward process, but it's important to take safety precautions. Fuel under pressure can be dangerous, so it's recommended to wear safety glasses and gloves, work in a well-ventilated area, and avoid smoking or anything that could cause a spark.

Step 1: Check Fuel Pressure

Start the car and let it idle. Install a fuel pressure gauge and run the pump, noting the pressure reading. Compare this reading to the manufacturer's specifications. For a 91 Geo Tracker, the fuel pressure should be between 34-41 psi when the engine is idling. If the pressure is low, this could be the cause of the problem.

Step 2: Perform a Fuel Volume Test

If the fuel pump is supplying sufficient pressure, the next step is to perform a fuel volume test to ensure the proper amount of fuel is being delivered to the fuel injectors. This can be done by using a flowmeter, or by performing a timed fuel delivery test.

Step 3: Collect a Fuel Sample

Start the car, which will signal the pump to run, and collect a fuel sample for five seconds with the pump running. The pump should deliver a specific amount of fuel within this time frame, which can be found in the manufacturer's specifications.

Step 4: Compare Results and Take Action

Compare the pressure and volume readings to the manufacturer's specifications. If the pressure or volume is outside the specified range, there may be an issue with the fuel pump or another component of the fuel system.

Additional Notes on the Geo Tracker:

It is worth noting that there are varying reports on the required fuel pressure for the 91 Geo Tracker, with some sources stating it should be between 34-41 psi, while others suggest it could be as low as 9-14 psi. It is always best to refer to the manufacturer's specifications or a repair manual for the most accurate information.

Additionally, if you are experiencing issues with your Geo Tracker, such as difficulty starting or running, it is recommended to check the fuel pressure, fuel filter, and exhaust for any restrictions or blockages.

Fuel pump failure symptoms

The fuel pump plays a crucial role in making your car move, so it's important to know the warning signs of a failing fuel pump. Here are some common symptoms of a bad fuel pump:

• The car won't start or struggles to start: If your car is having trouble starting, it could be due to a damaged or clogged fuel pump. The issue might also lie in the fuel not reaching the engine.
• The car sputters or stalls while driving: If your engine is sputtering or stalling, it's likely due to low pressure caused by a faulty fuel pump, resulting in insufficient fuel and air mixture for combustion. This issue may be more noticeable when accelerating or driving uphill.
• Engine surging: If your engine experiences power surges, with speed spikes and drops, it could be due to the fuel pump sending too much fuel to the engine.
• Whining noise from the fuel tank: If you hear a low-grade whining or whirring noise coming from your fuel tank, it could indicate a problem with the fuel pump. Typically, a fuel pump makes a low, barely noticeable humming sound. However, when something is wrong, the pitch increases significantly.
• Lower fuel efficiency: If your fuel pump is damaged or worn out, it can allow excess fuel into the engine, resulting in decreased fuel efficiency and more frequent trips to the gas station.
• Loss of power during acceleration or driving uphill: When your engine is under stress, such as during acceleration or when driving uphill, it requires more fuel to operate optimally. If the fuel pump isn't working properly, you may experience a loss of power during these situations.

It's important to note that sometimes these symptoms can be caused by other issues, such as bad fuel, damaged fuel lines, or a clogged fuel filter. Therefore, it's always recommended to consult a qualified technician for a comprehensive inspection and accurate diagnosis.

Fuel pump replacement cost

The fuel pressure for a 91 Geo Tracker with a 1.6L engine is between 34-41 psi. If you are experiencing issues with your fuel pump, it may be time for a replacement. The cost of replacing a fuel pump depends on several factors, including the make and model of your vehicle, the complexity of the repair, and whether you choose to do it yourself or take it to a professional.

The parts cost of a fuel pump can range from $75 to $250, depending on the vehicle. If you decide to replace the fuel pump yourself, you will need to factor in the cost of your time and any necessary tools. Replacing a fuel pump is generally considered an intermediate-level task.

If you choose to have a professional replace your fuel pump, the cost can range from $400 to $600, with some dealership prices reaching $750. The labour cost can vary depending on the expertise of the mechanic and the tools they have on hand, typically ranging from $100 to $150 per hour. The replacement process can take anywhere from 1 to 6 hours to complete.

It is worth noting that fuel pump replacement costs can vary depending on the specific vehicle and the location of the repair. Additionally, it is always a good idea to have a professional diagnose the issue before proceeding with any repairs.

Frequently asked questions