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Discussion Starter · #1 ·
HI, I am new to this forum as for posting but I have followed many threads that have led to successful repairs on other concerns.

The issue I have is, I have a '06 GMC C5500 6. liter diesel with duel tanks. The gauge never reads higher than 1/8 tank. While testing, I have measured 65 ohms and 75 ohm respectively on front and rear tank sender. If the senders are unplugged and I turn start engine, I get a prove out which moves the needle from empty to full, then after 10 seconds, the needle drops to 1/8 tank and remains there. The frame pump is inop because it is not being powered up.

I have already tried a different instrument cluster and I have no fuses blown.

Does anyone know where I should go from here?

Thanks, Dellis
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