Rajan Wilcox
Replacing the fuel pump on a 1990 Mustang is a relatively straightforward process. It involves removing the old pump by taking off the screws that hold the bracket in place, disconnecting the electrical connection and hose clamp, and then pulling off the old pump. You can then install the new pump by sliding the tank under, hooking up the fuel lines and electrical connection, and reconnecting the negative battery cable.
| Characteristics | Values |
|---|---|
| First steps | Release the fuel pressure, remove the fuel pump bracket screws, and take off the red protective caps from the pump inlet and outlet |
| Next steps | Install the rubber isolator, test fit the pump into the bracket, and put a bit of motor oil on the new gasket |
| After that | Slide the tank under, hook up the fuel lines, and reconnect the negative battery cable |
| Final steps | Turn the key to the "On" position and listen for the pump, place the pump back in the hanger, and slide the S-hose back onto the bracket side |
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What You'll Learn
Removing the old fuel pump
To remove the old fuel pump, you will need to release the fuel pressure. You can do this in one of three ways:
- Release the fuel pressure by the Schrader valve behind the alternator. It looks like a tire stem valve once the cap is removed. Use a flathead screwdriver to pry in there and release the pressure while using a rag to catch any built-up pressure in the system.
- Go into your trunk or hatch on the driver's side and go underneath the back panel to unplug the inertia switch.
- Remove the four little screws that hold the bracket on, remove one electrical connection and one hose clamp, and pull off the old pump.
Once the old pump is removed, you can install the new one by following the instructions in the kit. You will need to drop the assembly back into the tank.
First, put a bit of motor oil on your new gasket and pop it into place. Then slide the tank under. Hook up the fuel lines (they just snap right together) and the electrical connection. Then reconnect your negative battery cable and turn your key to the "On" position, and listen for the pump, just to make sure it's working right.
Finally, place the pump back in the hanger and then slide the S-hose back onto the bracket side and fully tighten the clamp. Reinstall both of the bracket screws. Press on the fuel filter sock at this time. Using a pair of needle-nosed pliers, attach each of the electrical terminals. You can see the differences here in the terminals’ size, but the pump is also clearly marked with a plus for positive and a minus for negative. Once this is connected, you are all done and can reinstall the assembly back in the tank.
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Installing the new fuel pump
To install a new fuel pump in a 1990 Mustang, first, put a bit of motor oil on your new gasket and pop it into place. Then slide the tank under. Hook up the fuel lines (they just snap right together) and the electrical connection. Then reconnect your negative battery cable and turn your key to the "On" position, and listen for the pump, just to make sure it's working right.
Place the pump back in the hanger and then slide the S-hose back onto the bracket side and fully tighten the clamp. Reinstall both of the bracket screws. Press on the fuel filter sock at this time. Using a pair of needle-nosed pliers, attach each of the electrical terminals. You can see the differences here in the terminals’ size, but the pump is also clearly marked with a plus for positive and a minus for negative. Once this is connected, you are all done and can reinstall the assembly back in the tank.
Before you begin the installation, you will want to release the fuel pressure. You can do this with one of three ways:
- You can release the fuel pressure by the schrader valve behind the alternator. It looks like a tire stem valve once the cap is removed. Use a flathead screwdriver to pry in there and release the pressure while using a rag to catch any “built-up” pressure in the system.
- You can go in your trunk or hatch on the driver side and go underneath the back panel and unplug the inertia switch.
- Remove four little screws that hold the bracket on, remove one electrical connection and one hose clamp, and pull off the old pump.
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Attaching the electrical terminals
To attach the electrical terminals, you will need a pair of needle-nosed pliers. The terminals are clearly marked with a plus for positive and a minus for negative. You can see the differences in the terminals' size, but the pump is clearly marked. Once this is connected, you are all done and can reinstall the assembly back in the tank.
First, you will want to release the fuel pressure. You can do this with one of three ways: 1) You can release the fuel pressure by the Schrader valve behind the alternator. It looks like a tire stem valve once the cap is removed. Use a flathead screwdriver to pry in there and release the pressure while using a rag to catch any built-up pressure in the system. 2) You can go in your trunk or hatch on the driver side and go underneath the back panel and unplug the inertia switch. 3) You can take off the four little screws that hold the bracket on, remove one electrical connection and one hose clamp, and pull off the old pump.
Then, put a bit of motor oil on your new gasket and pop it into place. Slide the tank under and hook up the fuel lines (they just snap right together) and the electrical connection. Reconnect your negative battery cable and turn your key to the 'On' position, and listen for the pump, just to make sure it's working right.
Finally, place the pump back in the hanger and then slide the S-hose back onto the bracket side and fully tighten the clamp. Reinstall both of the bracket screws.
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Reinstalling the assembly
To reinstall the assembly, you'll need to place the pump back in the hanger and then slide the S-hose back onto the bracket side. Tighten the clamp and reinstall both of the bracket screws. Press on the fuel filter sock. Using a pair of needle-nosed pliers, attach each of the electrical terminals. You can see the differences in the terminals' size, but the pump is also clearly marked with a plus for positive and a minus for negative. Once this is connected, you can reinstall the assembly back in the tank.
First, put a bit of motor oil on your new gasket and pop it into place. Then slide the tank under. Hook up the fuel lines (they just snap right together) and the electrical connection. Reconnect your negative battery cable and turn your key to the "On" position, and listen for the pump, just to make sure it's working right.
You can now drop the assembly back into the tank.
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Testing the new pump
Once you have installed the new fuel pump, you will need to test it to make sure it is working correctly. First, reconnect the negative battery cable and turn the key to the 'On' position. Listen for the pump to make sure it is working. You can also test the fit of the pump by installing the rubber isolator and then test-fitting the pump into the bracket.
To release the fuel pressure, you can use one of three methods. The first is to use a flathead screwdriver to release the pressure by the Schrader valve behind the alternator. The second is to go into the trunk or hatch on the driver's side and go underneath the back panel to unplug the inertia switch. The third method is to use the schrader valve behind the alternator to release the pressure. Make sure you use a rag to catch any built-up pressure in the system.
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Frequently asked questions
First, put a bit of motor oil on your new gasket and pop it into place. Then, slide the tank under and hook up the fuel lines and the electrical connection. Re-connect your negative battery cable and turn your key to the "On" position, and listen for the pump, just to make sure it's working right.
You will need a new fuel pump, a new gasket, motor oil, a flathead screwdriver, a rag, and a pair of needle-nosed pliers.
Once you have reinstalled the assembly back into the tank, turn your key to the "On" position and listen for the pump. If you can hear it, it's working right.
