The fuel sending units in the G body wagons are unique to the wagon only and the factory replacement ones are extremely rare. Here is a link to the Astro van fuel sender that will work in the G body wagon tank. These are great if you are doing an EFI swap because they are designed to hold the submersible in tank pumps. But, even if you dont need an in tank pump, this sender will still work as a sender alone. I have one in my Malibu wagon and the float works perfect. Full to empty reading is accurate. At this price you should just get one and put it on the shelf in case its needed in the future. I just ordered a spare to keep on my shelf
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