Sylvie Willis
The 1994 F-150 is a pickup truck manufactured by Ford. It has dual gas tanks, with a capacity of 38 gallons, and two different designs for pumping fuel to the engine. While some models pump fuel from the rear tank to the front tank, others can pump directly to the engine. Owners of this model have reported issues with overflowing front tanks, which can be resolved by repairing or replacing the switching valve. Draining the rear fuel tank of a 1994 F-150 can be achieved through siphoning, although this method requires practice and carries some risks.
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What You'll Learn
Siphoning the tank
Another approach to siphoning the tank involves using an outboard motor fuel line and ball to drain the fuel through the tank fill. Before beginning the siphoning process, it is recommended to blow bubbles at the end of the hose to ensure it is submerged in the fuel.
Additionally, one user suggested disconnecting the fuel line before the filter and connecting it to another vehicle's gas tank to drain the fuel. This method involves turning on the key to start the flow of fuel.
It is important to note that siphoning fuel can be dangerous and should be done with caution. It is always recommended to consult a professional or a mechanic before attempting any repairs or maintenance on a vehicle.
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Disconnecting the fuel line
First, locate the fuel line. It is usually found near the fuel filter. Place a container or a drain pan underneath the fuel line to catch any spilled fuel. Make sure to wear protective gear, such as gloves and eye protection, to shield yourself from any fuel splashes.
Next, carefully disconnect the fuel line by loosening any clamps or couplings holding it in place. You may need to use a wrench or a pair of pliers to loosen the connections. Once the line is disconnected, be cautious of any residual fuel that may drip from the line or the tank.
At this point, you can attach a fuel hose to the disconnected line. Secure the hose with a clamp to ensure a tight seal. Place the other end of the hose into a suitable container for fuel collection.
If you are simply looking to drain the tank, you can now proceed with that step. However, if you are performing maintenance or repairs that require the fuel line to be completely removed, make sure to properly cap or plug the open end to prevent any debris or contaminants from entering the line.
Remember to exercise extreme caution when working with fuel. Ensure adequate ventilation in your work area and avoid any open flames or sparks that could cause an explosion. Always refer to your vehicle's repair manual or seek professional assistance if you are unsure about any steps in the process.
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Using a fuel hose and clamp
To drain the rear fuel tank of a 1994 F-150, you can use a fuel hose and a clamp. This method does not require removing the tank or dropping it. Here is a step-by-step guide:
Step 1: Disconnect the Fuel Line
Locate the fuel line before the filter and disconnect it. You may need to refer to your vehicle's manual or seek advice from a qualified mechanic if you are unsure about the fuel line location.
Step 2: Attach the Fuel Hose with a Clamp
Take a fuel hose and securely attach one end to the disconnected fuel line using a clamp. Make sure the connection is tight to prevent any leaks.
Step 3: Position the Other End of the Hose
Place the other end of the fuel hose into a suitable container for catching the drained fuel. Ensure the container is properly placed and stable to avoid any spills.
Step 4: Turn the Key
Once the hose is in position, turn your key to the "on" position. This will activate the fuel pump and start the drainage process. You may need to refer to your vehicle's manual to identify the correct key position.
Step 5: Monitor the Draining Process
Keep an eye on the draining process to ensure it proceeds safely and smoothly. Be cautious of any leaks or spills, and be prepared to turn off the ignition if needed.
Step 6: Complete the Drainage
Allow the drainage to continue until the desired amount of fuel has been removed from the tank. This may take some time, depending on the amount of fuel in the tank.
Step 7: Disconnect the Hose and Secure the Fuel Cap
Once you have finished draining, carefully disconnect the fuel hose from the fuel line and securely replace the fuel cap. Make sure all connections are tight to prevent any leaks during future use.
This method provides an alternative to siphoning or removing the fuel tank entirely. Always exercise caution when working with fuel, and refer to a qualified mechanic if you have any concerns or uncertainties.
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Jumping the fuel pump relay
To jump the fuel pump relay on a 1994 F-150, you will need to test the power sources and wiring. First, check if your Horn works and if you can swap the Horn relay with the Fuel Pump Relay and the PCM Power Relay to see if one of those two are faulty. If the "U" fuse keeps blowing, then replace the PCM Power Diode. If all that checks out, grab a paper clip or a short piece of wire and jump Fuel Pump Relay sockets 30 and 87. If the Fuel Pump runs, then you know the wiring, the inertia switch, the selector switch, and the fuel pump are all in good condition.
If everything above checks out, you will want to determine if the Ground that the PCM is providing to the Fuel Pump Relay socket 85 is reaching it to energize the relay. If you grab a jumper wire, KEY ON, attach one side to a good ground and the other side to socket 6, it will take the PCM Fuel Pump Ground Signal to the Fuel Pump Relay socket 85 out of the equation. If that makes the fuel pump run, then you have to check for continuity between relay socket 85 and the connector on the PCM for the Fuel Pump Relay Control (which should be Pin 22 on your model).
The 1994 F-150 has a fuel pump module, which means it cannot be jumped. You will have to use a scan tool or jump power and ground to the two wires leading to the fuel pump. To do this, you will need to unplug the connector at the driver module above the spare tire and apply power and ground to the pump to make it run. Then, disconnect the fuel filter on the fram rail to drain the tank.
The most common causes of fuel pump relay failure are current overload, short circuit, and defective internal components. To confirm if the fuel pump relay is the issue, you can test it with a multimeter or replace it with another relay of the same specifications.
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Replacing the fuel pump
To replace the fuel pump of your 1994 F-150's rear fuel tank, you will need to remove the fuel tank. This is because there is no drain plug on the 1994 F-150.
Before you begin, note that it is usually easier to drop the tank due to the amount of corrosion usually found on the bed bolts.
- Remove the fuel tank. Be careful not to get any debris in the tank and not to have any open flames around.
- Once the fuel tank is removed, take out the fuel pump. Clean the tank and drain it this way.
- Put a light coating of Premium Long-Life Grease XG-1-C or -K, or an equivalent meeting Ford specification ESA-M1C75-B, on a new fuel pump mounting gasket to hold it in place during assembly. Install it in the fuel ring groove.
- Install the fuel tank sending unit and pump carefully, ensuring that the fuel filter is not damaged. Make sure the tabs of the fuel tank sending unit and pump are positioned into the slots of the fuel tank.
- Hold the fuel tank sending unit and pump, and fuel pump mounting gasket in place. Install and rotate the fuel pump locking retainer ring clockwise until the stop is against the retainer ring tab.
- Install the fuel tank.
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Frequently asked questions
You can siphon the fuel out by sticking a rubber hose in through the filler neck and sucking on it a bit until the fuel starts flowing, then stick the hose into a container.
You can replace both the front and rear tanks with a single 38-gallon tank, which is roughly half the cost of the distribution block if you do it yourself.
If your rear pump is pushing past the front's check valve, you will need to either place an external check valve inline or replace the fuel pump.
