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Old 02-27-2011, 11:52 AM
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Fuel sending unit

Hello I just got a fuel cell with the 0-90 ohm sending unit installed on my truck and when i hook up the gauge to the sending unit it stays at full like there's power to the gauge but its not reading the sending unit even if i move it by hand i have tried 2 gauges one with the needle and one digital any help is appreciated

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Old 02-27-2011, 01:28 PM
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Make sure the sending unit is wired in series with the gauge.
When the float is in the full position (0 ohms) the gauge should read full. This means 12 volts is driving the gauge to its max.
When the float position is anything less than full more resistance is added to the circuit and the gauge reads less than full until the 90 ohm resistance is reached. The gauge is being supplied with less voltage until it reads empty.
Check to see if the gauge is the correct one for the sender. There are many different resistance ranges available. The gauge and sender must be compatible.

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Old 02-28-2011, 09:24 AM
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fuel sending unit question

I replaced my fuel sending unit on my 1992 chevrolet 3/4 ton last week well i hade to ground it of the truck bed cause the bolt would not come out the fram were it was grounded, (the pump worked) but my gauge did not go back to E when turned off, so yesterday I put a bolt threw a whole in the fram to ground the wire off the fram the thing is I did not think about taking the negative battery cable off so know the pump is not doing anything I checked the fuse the fuse is GOOD could this cause the fuel relay to short out. The fuel pump new 6 months ago.
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Old 03-03-2011, 11:13 PM
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finally got to messing with it again but it turned out to be the wiring, i tryed to wire it in with my fan guess it drained from the sending unit, but ran its own wires and it works like a charm, thanx for the help
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