question about fuel sending unit
 

OK HERE GOES. THE GAS GAUGE READS EMPTY. I PULL THE SENDING UNIT OUT AND IT READS PAST FULL.(WITH WIRE CONNECTED) I GROUND THE SENDER, AND AT THIS POINT I CAN MANUALLY MOVE THE FLOAT ARM UP AND DOWN AND THE FUEL GAUGE READS FULL SWEEP JUST LIKE IT SHOULD. SO NOW I TAKE THE FLOAT OFF THE ARM AND THERE'S NO GAS IN IT. JUST FOR KICKS I FILL UP THE TUB AND PUT THE FLOAT AND SENDER IN AND IT FLOATS. I'VE CHECKED THE SENDER WITH A METER AT BOTTOM IT READS 1.5 OHMS AND AT THE TOP(FULL) IT READS 95 OHMS. I WOULD THINK THIS IS WITHIN RANGE. THE ONLY THING I CAN THINK OF IS THE FLOAT IS HANGING AGAINST THE TANK WALL, BUT HOW DOES IT READ EMPTY? DOES ANYONE HAVE ANY SUGGESTIONS? IF THE FLOAT FLOATS IN WATER IT SHOULD FLOAT IN GAS, RIGHT? :confused: :confused: :confused:

sounds like a problem with your tank ground

If the tank wasn't grounding, the gauge would read full, just like it did when the sender was removed, and not grounded. I would agree, it (the float) could be sticking, or the wire harness has a dead spot from corrosion or a break, that reconnected when you removed the sending unit. Have you reinstalled, and tried it again? Move the wires around by hand with the sending unit in the tank to check for a brake in the wire.

there's supposed to be a black wire from the sending unit directly to ground on the cab is it there and hooked up???

Has anyone considered that the fuel gauges aren't all that accurate? :D

He said the gauge moved full sweep when the float was manually operated, so I skipped the gauge being at fault, but it is a possability, if nothing else is found to be wrong.

Can be any of the wiring from the sending unit to the dash.......check it all.

Don't mean to stomp on your thread, but I would like to know the proper ohm rating for an aftermarket sender that will match the factory guage for a custom made tank. Thanks

90 I think.

PURS IS RIGHT IT SHOULD BE 0 TO 90 OHMS..BTW GUYS, I PULLED IT BACK APART AND SHOOK IT. I COULD HEAR GAS INSIDE THE FLOAT. THE FIRST TIME I JUST STUCK IT IN WATER AND IT FLOATED. I GUESS THERE WAS ENOUGH FOR IT TO NOT FLOAT IN GAS? I'M GONNA HIT A WRECKING YARD OR TWO TODAY AND FIND A FLOAT...I MEAN I'M GOING SHOPPING FOR MY WIFES BIRTHDAY GIFT TODAY AND IF I SEE A WRECKING YARD, I MIGHT STOP IN....


MAN I CAN'T BELIEVE I DIDN'T SEE THAT THE FIRST TIME! I AM STUPID.. I AM STUPID...ETC.:mad: :confused: :mad: :D

The surface tension of water is much higher than gas, and will support more weight, therefore the float floated in water, but not gas.... see were this is going??? The first time was practice, the second time you KNEW what you were looking for... therefore you can't be stupid, or the second time would have been practice too!!!... and the third, and the fourth...lighten up.. other people tell us we're stupid often enough. Good luck shopping for the wife's float.. I mean gift!