Ameer Randolph
Bench testing an in-tank fuel pump can be a simple process, but it requires careful preparation to ensure safety. The fuel pump should be removed from the vehicle and placed in a safe area, preferably outdoors, to avoid the risk of vapors igniting. It is important to remember that fuel pumps are lubricated by fuel, so they should not be run without any fluid. A suitable fluid, such as kerosene, mineral spirits, or isopropanol, can be used instead of gasoline to avoid the risk of explosion. The pump can then be powered using a battery or drill motor, and the flow rate can be measured by pumping fluid from one container to another over a set period of time.
| Characteristics | Values |
|---|---|
| Difficulty | Bench testing a fuel pump is a simple process. |
| Tools | A bucket of water or extinguisher, 100 PSI gauge, brass barbed fitting, cordless drill motor battery, old set of R-12 gauges, clear plastic tubing, 12V on/off switch, fire extinguisher, kerosene, mineral spirits, transparent container, battery |
| Steps | - Remove the tank and open the base plate. |
- Hook up the fuel pump to siphon into and pump back into a can of fuel.
- Apply 12 volts to the pump.
- Measure flow rate.
- Time how long it takes to pump a pint of fluid. |
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What You'll Learn
Testing without a tank
Testing an in-tank fuel pump without a tank requires a careful setup to ensure safety and accuracy. Here is a step-by-step guide on how to perform this test:
Firstly, gather the necessary equipment: a suitable container, such as a pretzel jar or a cut-out milk jug, fuel (gasoline), a power source, hoses, clamps, and a fire extinguisher for safety. Ensure you have a well-ventilated workspace to avoid the buildup of flammable gas fumes.
Prepare your container by filling it with fuel. The amount of fuel required will depend on the specifications of your pump, but ensure it is securely placed and cannot be knocked over. Place the pump on a hanger assembly and set it inside the container, ensuring it is partially submerged in the fuel.
Next, connect the power source. If possible, use a simple 12V on/off switch and secure all wires to minimize sparks. Remember, these pumps are high-pressure and high-volume, so ensure the output hose is securely connected to avoid any mishaps. Clamp the pump to your bench to minimize movement during operation.
With everything connected, you can now power up the pump. Monitor the pump's performance, timing how long it takes to pump a specified volume of fuel. Compare this against the pump's rated specifications to determine if it is functioning correctly.
Finally, remember to exercise caution when dealing with gasoline and electrical equipment. Always have a fire extinguisher nearby and ensure your workspace is well-ventilated to prevent the buildup of flammable fumes.
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Using kerosene or mineral spirits
When bench-testing an in-tank fuel pump, it is important to ensure that the pump is not run without fuel or fluid as fuel lubricates the pump. Therefore, a suitable alternative fluid must be used.
Kerosene or mineral spirits are often suggested as alternatives to gasoline when testing a fuel pump. Gasoline is not recommended due to its extreme flammability. Kerosene is a good alternative as it has similar properties to gasoline in terms of density and viscosity, so it can provide an accurate test without the flammability risks.
To conduct the test, run a line from the inlet fitting of the pump into a container of kerosene or mineral spirits. The container should be no more than about a foot below the level of the pump. Run another line from the outlet fitting into a quart container that is marked to measure the volume pumped. Attach the positive and negative leads from a battery to the pump and time how long it takes to pump a set volume of fluid. A good flow rate is considered to be pumping a pint of fluid in 55 seconds or less.
It is important to note that while kerosene or mineral spirits are recommended, some people have also used water for a basic test. However, water has different properties to gasoline, so it may not provide as accurate a test as kerosene. Additionally, it is crucial to ensure that all residual moisture is removed from the pump after testing with water, as water left in the pump can mix with gasoline and cause issues.
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Testing with a battery
Testing an in-tank fuel pump with a battery requires careful setup and caution. Here is a step-by-step guide:
Prepare the Setup:
- Fuel Source and Container: Place the fuel pump in a suitable container, such as a bucket or a large jar. Ensure the container is secure and can hold fuel.
- Fuel Pump Connection: Connect the fuel pump to a fuel source, such as a can of fuel. Ensure that the fuel can gravity-feed the pump, as these pumps are typically 'push' pumps, not 'pull' pumps.
- Hoses and Tubing: Use hoses or clear plastic tubing to connect the fuel pump to the fuel source and create a closed system. Ensure the output hose is securely connected to the pump to prevent leaks.
- Ventilation and Safety: Perform the test in a well-ventilated area to prevent the buildup of flammable gas fumes. Keep a fire extinguisher nearby as a safety precaution.
- Battery Connection: Connect the fuel pump to a 12-volt battery to power the pump. Ensure that the battery is capable of providing consistent power.
- Power Application: Apply power to the fuel pump by turning on the battery. You may need to "'pulse' the pump with 12 volts," simulating the pump's normal operation.
- Observation and Measurement: Observe the pump's behaviour. Listen for any unusual noises, such as clicking or the absence of the familiar buzz, which could indicate an issue. Measure the time it takes for the pump to move a given quantity of fuel, and compare it with previous records or expected performance.
- Pressure and Regulation: If possible, measure the fuel pressure using a pressure gauge. You can also adjust the pressure using a regulator setup or a manual valve to test the pump under different load conditions.
- Spark Prevention: Ensure that there are minimal sparks when connecting and operating the setup. Use a simple on/off switch to secure all wires and minimise the risk of sparks.
Remember, it is essential to exercise caution when working with fuel and electricity. Always prioritise safety and follow appropriate procedures to avoid any potential hazards.
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Measuring flow rate
Measuring the flow rate of a fuel pump is a crucial aspect of understanding its performance and ensuring optimal fuel delivery to the engine. Here are some detailed methods and considerations for measuring flow rate:
Using a Flow Meter:
One of the most accurate ways to measure flow rate is by using a flow meter. This device can be connected inline with the fuel rail to measure fuel pressure and total system flow, including the flow of fuel being returned to the tank. It provides valuable data on the fuel volume output and helps identify any underperforming components in the fuel system.
Timed Fuel Delivery Test:
If access to a flow meter is limited, a timed fuel delivery test can be conducted. This involves collecting a fuel sample for a specified duration, typically five seconds, with the pump running. By referring to the manufacturer's specifications, you can determine if the pump is delivering the correct amount of fuel within that timeframe. This method requires careful measurement and the use of an appropriate container, with glass being a preferable option due to fuel's potential to corrode or fog up plastic.
Voltage and Pressure Relationship:
The flow rate of a fuel pump is closely related to voltage and pressure. Increasing voltage leads to an increase in flow rate, while higher pressure results in a higher amp draw. Therefore, measuring voltage and pressure can provide insights into the flow rate. For instance, a decrease in voltage at the pump terminals reduces motor torque and the volume capacity for a given pressure.
Fuel System Curve Charts:
Referring to fuel pump curve charts can offer valuable information about flow rates at different pressures. These charts illustrate how flow rate changes with voltage and pressure. For instance, a chart might indicate that a pump has a free-flow rate of 78 gallons per hour (gph) at 60 psi, but the flow rate drops to 62 gph at higher pressures.
Safety Considerations:
It is essential to prioritize safety when dealing with fuel systems. Releasing fuel under pressure can pose fire hazards and safety risks. Always wear safety gear, including gloves and eye protection, and work in a well-ventilated area. Ensure there are no sources of ignition nearby, and avoid smoking during the testing process.
Calculating Required Fuel Flow:
When selecting fuel pumps, filters, and lines for a performance engine, it is crucial to ensure they can deliver the required fuel flow to meet the engine's power needs. This involves calculating the engine's fuel consumption and flow rate, often using Brake-Specific Fuel Consumption (BSFC) measurements. By knowing the amount of power the engine makes and the type of fuel used, you can estimate the required fuel flow in gallons per hour (GPH) or gallons per minute (GPM).
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Safety considerations
Safety should be a top priority when bench testing an in-tank fuel pump. Here are some critical safety considerations to keep in mind:
Explosion Risk
Fuel vapors in the presence of air can create an explosive mixture. Never hook up any electric fuel pump to a 12-volt source without completely submerging it in fuel or an appropriate alternative fluid. This is because the pump can explode, and fuel vapors in the air can create a dangerous and explosive mixture. It is highly recommended to perform the test outdoors to avoid the risk of vapor buildup in an enclosed space.
Fire Hazards
Keep a fire extinguisher close at hand. Gasoline and electrical arcs in close proximity pose a significant fire risk. Do not use water, CO2, or a dry chemical fire extinguisher. Instead, opt for a specialized fire suppression agent suitable for fuel fires.
Fluid Choice
The choice of fluid for the test is crucial. Gasoline is highly flammable and not recommended. Alternative fluids such as kerosene, mineral spirits, or treated kerosene that closely resembles gasoline in density and viscosity can be used. These alternatives provide more accurate test results than water, which has different properties and may not reveal small leaks or pumping issues.
Pressure and Voltage
Ensure that the pressure and voltage during the test match the expected operating conditions. Inadequate pressure or voltage can lead to inaccurate test results and potential damage to the pump. Properly diagnose the issue before performing the test, as bench testing may not be necessary if the problem can be identified through other means.
Proper Setup
Follow a detailed and reliable setup procedure. Consult online forums, manufacturer guidelines, or expert advice to ensure you have the correct setup for your specific fuel pump. This includes using appropriate hoses, fittings, clamps, wiring, and a suitable power supply. Inadequate setup can lead to inaccurate test results or safety hazards.
Safety is paramount when working with fuel pumps and flammable substances. Always prioritize safety measures, and if you are unsure about any aspect of the process, seek advice or guidance from experienced professionals or reliable sources.
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Frequently asked questions
It is recommended to leave the pump in the tank and put power and ground to the pump. You can then pump out a gallon or more into a container and time it. You can calculate whether your pump is up to spec or not.
It is recommended to use kerosene or mineral spirits. Gasoline is not a great fluid to use due to its extreme flammability.
You can use a battery to power the pump.
Gasoline is extremely flammable, so make sure the output hose is safely secured. These pumps will move around a lot while running, so clamp it down to your bench before firing it up.
Keep a bucket of water or an extinguisher nearby. Fuel vapors in the presence of air can create an explosive mixture.
