Dropping the tank is a big job, so it makes sense to replace the fuel pump assembly when the pump is weak, noisy, or the sending unit is already acting up.
Ordering by model name alone is not enough for an Acura in-tank replacement. The available assemblies combine the pump with fuel-level sending components, while the electrical connection can still separate similar-looking units. Start with the exact vehicle, then compare the original module with the replacement for sender design, connector shape, terminal count, flange, and overall depth.
Compare your vehicle details with the stated fitment for this Acura TSX fuel pump assembly.
The float arm moves the fuel-level sender, so its shape and travel matter independently of pump operation. Confirm that the selected assembly includes the sender components required for the repair, and keep the original unit available for comparison until the new float clears the tank wall and wiring through its full range of motion.
Some Acura applications use a four-pin connector, making terminal count a practical fitment check rather than a cosmetic detail. Count the terminals on the vehicle-side plug, compare the keyed lock, and make sure the connector seats without force. Do not try to solve a pin mismatch by transferring the float or modifying the harness.
An inaccurate gauge after installation does not by itself prove that the new pump has failed. Recheck the sender connector, float movement, and gauge circuit, then diagnose any fuel-delivery complaint separately. Before closing the access area, verify that the module is secure and that no fuel is visible around the flange or line connections.
It is usually better to finish the diagnosis first. Ordering too early can leave you with a part you do not need, especially when a no-start or drivability complaint still has several possible causes.
Keep the old unit until the vehicle has been returned to service and the repair has been verified. It can help the installer document what was removed if a follow-up question comes up.
Leave it in its original packaging in a clean, dry place where the electrical terminals and plastic fittings cannot be bent or contaminated. Avoid opening the package just to test the pump.
Keep the order confirmation, installation invoice, and any diagnostic notes from the repair. Those records make future service history easier to understand and can be useful if support is needed later.
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