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Old 03-04-2007, 06:45 PM   #1
85 FB
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Join Date: Mar 2007
Posts: 1
Fuel gauge problem; '85 Mazda RX-7 GSL-SE 13 motor

Hello all, I'm new to this Forum, and I'm hoping I can get some clarity on my situation. I have a 1985 Mazda RX-7 GSL-SE, 13B fuel-injected motor.

I have just installed a brand new fuel sending unit into a replacement gas tank, however I'm experiencing a problem. Anytime I turn my key to the ON position, the fuel gauge reads true. But, when I start the motor, the fuel gauge drops lower; about 1/4 low from where the needle was before the engine started up.

I checked all my connections, and they look just fine. The only thing I can think of why this is happening is that when the fuel pump starts up, it's sharing power from the fuel sending unit and causing a bad reading.

What could be my problem?
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