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Greg, import technician
Category: Mazda
Satisfied Customers: 7062
Experience:  17 years shop owner import
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Fuel gauge inoperable still even with new sending unit,

Customer Question

Fuel gauge inoperable still even with new sending unit
JA: How has your mileage been lately? Has the car been starting normally?
Customer: Starts runs fine tank full gauge shows empty
JA: What is the model/year of your Mazda?
Customer: 07 mazda 3
JA: What year is your Mazda?
Customer: 2007
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Goodbye
JA: OK. To minimize me, please click the down arrow at the top right corner of this box.
Customer: Fuel gauge inoperable on 2007 masda 3
JA: Anything else you think the mechanic should know?
Customer: New sending unit with no change in operation
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Mazda Mechanic about your situation and then connect you two.
Submitted: 1 year ago.
Category: Mazda
Expert:  Greg replied 1 year ago.

Disconnect the battery and hold your foot on the brake pedal for a full minutes ,reconnect and recheck the gauge .

You have done the most common issue for a bad gauge reading, the float sensor replaced .

So it looks like you have a bad wiring issue or instrument cluster malfunction .

Attached is a wiring diagram that should help you with diagnosing this issue .

You may have a bad instrument cluster if all the wiring checks out good.

Still need additional information then please get back to me with the reply button, and not the poor or bad service, this way i can get back to you or suggest another expert if needed.
Your deposit does not pay me until the answer is rated in a positive way,
A bad rating does not constitute a refund.
If you are not happy or you have sorted out your problem before the answer then please let me know with the reply button .
Kind regards Greg.