Rajan Wilcox
Replacing a fuel pump on a 1990 Ford F150 is a straightforward process, but it's important to check for any leaks in your lines first. You'll need to disconnect the battery and the fuel filler hose, and then tilt the bed upward to access the tank. You have two options for replacing the fuel pump: either put the fuel return line into the tank you're using, or install a balance line between two tanks so that the fuel can balance properly.
| Characteristics | Values |
|---|---|
| Location of fuel pump | In the centre valley of the engine, roughly under the filter housing |
| Options for replacement | 1. Put the fuel return line into the tank you are using |
| 2. Install a balance line between tank 1 and tank 2 so that the fuel can balance back into tank 2 properly | |
| Tanks should be connected so that the fuel gauge reads the total fuel in the tanks and there is a need for only one fuel pump | |
| Steps to reach the tank | 1. Drop the bolts holding the bed to the frame |
| 2. Disconnect the battery | |
| 3. Disconnect the fuel filler hose | |
| 4. Tilt the bed upward so you can easily reach the top of the tank(s) | |
| 5. Unbolt back of drive shaft and shove it to the side |
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What You'll Learn
Disconnect the battery and fuel filler hose
Disconnecting the battery and fuel filler hose is a crucial step when replacing the fuel pump on a 1990 F150. Here's a detailed guide on how to do it:
First, locate the bolts holding the bed of your F150 to the frame. These bolts need to be removed to access the fuel tank. Once you've found them, use the appropriate tools to loosen and remove them.
After removing the bolts, you'll need to disconnect the battery. Make sure the ignition is off, and locate the negative terminal of the battery, which is usually marked with a "-" symbol. Disconnect the negative cable first to avoid any potential sparks.
Now, locate the fuel filler hose. This hose connects the fuel filler neck to the fuel tank. Carefully disconnect the hose from the neck and the tank. You may need to loosen any clamps or fasteners securing the hose in place.
Once the hose is disconnected, tilt the bed of your F150 upward. This will give you easier access to the fuel tank and the fuel pump.
By following these steps, you'll have successfully disconnected the battery and fuel filler hose, which is an important preparatory step for replacing the fuel pump on your 1990 F150. Remember to work in a well-ventilated area and take the necessary safety precautions when working with fuel systems.
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Remove the bed
To remove the bed of your 1990 F150, you'll need to drop the bolts holding the bed to the frame, disconnect the battery, disconnect the fuel filler hose, and tilt the bed upward. This will give you access to the fuel tank.
If you're working on the side tank, unbolt the back of the drive shaft and move it to the side. This will give you more room to work.
The factory wire leads are short, so if you're getting a Spectra pump, make the harness 6 to 8 inches longer than stock. Offset the two thicker pump wires and the two sender wires so the four crimp connectors aren't on top of each other. Tape the crimp connectors individually and put them in a piece of larger corrugated wire loom.
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Check for leaks in your lines
To check for leaks in your lines, first disconnect your fuel filter and try to blow through it. If there is a clog, this could be the issue. When you installed the pump on the sending unit, did you tighten the clamp on the hose to the pump? Make sure the hose is tight and that the pump is at the same depth as the previous one. Check your gas level to ensure there is enough for the pump to be submerged. If you then get pressure, the little rubber hose is likely letting the pressure out where it clamps on your sender. If not, check your fuel pressure regulator for a faulty internal diagram rupture.
Ford EFI pickups and Broncos from the late ’80s through the mid ’90s had their fuel pumps located in the tanks. When a pump dies or the filter gets plugged from rust and years of use, the pump will need to be replaced. The easiest route on pickups (F-150/F-350) is to drop the bolts holding the bed to the frame, disconnect the battery, disconnect the fuel filler hose, and tilt the bed upward so you can easily reach the top of the tank(s).
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Put the fuel return line into the tank
To put the fuel return line into the tank, you have two options:
- Put the fuel return line into the tank you are using.
- Install a balance line between tank 1 and tank 2 so that the fuel can balance back into tank 2 properly. The tanks should be connected so that the fuel gauge reads the total fuel in the tanks and there is a need for only one fuel pump.
To access the tank, you will need to remove the bed of the truck. This can be done by dropping the bolts holding the bed to the frame, disconnecting the battery, disconnecting the fuel filler hose, and tilting the bed upward.
It is also important to check for any leaks in your lines before beginning this process.
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Install a balance line between tank 1 and tank 2
To replace a fuel pump on a 1990 F150, you will need to check for any leaks in your lines. Disconnect the fuel filter and try to blow through it to check for a possible clog. If there is no clog, you will need to disconnect the battery, disconnect the fuel filler hose, and tilt the bed upward to reach the top of the tank(s).
If you are working on the side tank, unbolt the back of the drive shaft and move it to the side. You will also need to offset the two thicker pump wires and the two sender wires so that all four crimp connectors aren't on top of each other. Tape over the crimp connectors individually and put them in a piece of larger corrugated wire loom.
To install a balance line between tank 1 and tank 2, you will need to connect the two tanks with a line that has a valve at each tank. This will allow the aft tank to flow into the forward tank as it empties. You can also fabricate a big balance line between the tanks and plumb the return with equal-length return lines. This will help to prevent a pressure difference from side to side, which could cause one bank to run lean.
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Frequently asked questions
If your Ford F150 is not starting, try tapping on the fuel tank as someone tries to crank it. If it starts, it's likely that your fuel pump is faulty and needs replacing.
You will need to disconnect the battery and the fuel filler hose, and tilt the bed upward so you can easily reach the top of the tank.
First, check for any leaks in your lines. Disconnect your fuel filter and try to blow through it to check for a possible clog. If there is no clog, check your gas level to make sure there is enough fuel for the pump to be submerged.
The factory wire leads are very short, so if you're getting a Spectra pump, make the harness about 6 to 8 inches longer than stock. Offset the two thicker pump wires and the two sender wires so that all four crimp connectors aren't on top of each other. Tape over all your crimp connectors individually and put them in a piece of larger corrugated wire loom.
