Fuel Tank Ground
08-07-2009, 06:30 PM
#1
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Fuel Tank Ground
Fuel gauge worked fine. Changed tank, sending unit, fuel lines, ground strap (sending unit to fuel line). Now I have a bad ground, cause the gauge is pinned beyond full. Isn't the sending unit also grounded from the tank to the straps to the frame
08-08-2009, 04:14 AM
#3
Nope. The tank is insulated via the pads between the straps and the tank. the sending unit is insulated because of the gasket. There is a little metal "strap" that clips onto the fuel line before and after the rubber hose that connects the pick to and the main fuel line. This strap MUST be there.
08-08-2009, 03:20 PM
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I haven't tried the old sender yet cause I don't want to drop the tank if I don't have to. I do have the strap on the sending unit to main fuel line. I think if the gauge is all the way past full that I have a grounding problem. Maybe the insulation on the straps is failing or the gasket on the sending unit isn't seated properly. The sending unit is suppose to work between 0-100 ohms all of my testers say 1K next to ohms so that means 1000 is the minimum?
08-08-2009, 03:31 PM
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See if your testers say or have "auto-ranging", or a "range" button. I hope thats what you were asking re; the tester. Here's two sources about fuel gauges that I keep in my bookmarks, I hope they help you. http://www.moparfins.com/Repairs/Fue...uge_Repair.htm http://auto.howstuffworks.com/fuel-gauge1.htm
08-08-2009, 06:14 PM
#7
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I don't know what you are are working on, But I have read other posts and on other sites that the aftermarket sending units for some mopars are wrong 
. The resistance on the senders are incorrect and will never work properly. If it was mine I would double check the resistance of the new unit to the old one. I also would unhook the wire from the sender and have some one check and see if the reading changes. I also would ground the wire and see if the needle cycles. If not you might have a problem with the lead to the tank itself.
. The resistance on the senders are incorrect and will never work properly. If it was mine I would double check the resistance of the new unit to the old one. I also would unhook the wire from the sender and have some one check and see if the reading changes. I also would ground the wire and see if the needle cycles. If not you might have a problem with the lead to the tank itself.
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