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My fuel gauge has not worked properly from the time I bought the car. The needle moved slightly towards full so I assumed the sender was bad.
I tried checking the gauge by grounding the lead to the sending unit. Nothing. I checked the power to the sender and had a pulse of 5 v +/-, so it seems I have power to the sender.
I recently removed my fuel tank for repair to the drain plug fitting. The tank had been sealed around the flange with a mastic/putty of some kind. I'm wondering if this putty will affect the proper grounding of the tank? I removed the sender noted the float had gas in it so I'll replace it. I tested the resistance by clipping my meter to the power and ground lead. The resistance was not consistant when moving the float. It ranged from 50 through 160 ohms or so and was erratic when moving the float arm. The float arm seemed loose, perhaps not making good contact? Should the resistance be consistant when moving the float?
Also I'm wondering why the plug connector has 3 prongs. Isn't the sender grounded through the tank flange?
I may try plugging the sender in with it out of the tank, grounding it with a jumper and moving the arm. I'm thinking this should be true test if the resistor is working.
Appreciate any help/comments. Thanks
I tried checking the gauge by grounding the lead to the sending unit. Nothing. I checked the power to the sender and had a pulse of 5 v +/-, so it seems I have power to the sender.
I recently removed my fuel tank for repair to the drain plug fitting. The tank had been sealed around the flange with a mastic/putty of some kind. I'm wondering if this putty will affect the proper grounding of the tank? I removed the sender noted the float had gas in it so I'll replace it. I tested the resistance by clipping my meter to the power and ground lead. The resistance was not consistant when moving the float. It ranged from 50 through 160 ohms or so and was erratic when moving the float arm. The float arm seemed loose, perhaps not making good contact? Should the resistance be consistant when moving the float?
Also I'm wondering why the plug connector has 3 prongs. Isn't the sender grounded through the tank flange?
I may try plugging the sender in with it out of the tank, grounding it with a jumper and moving the arm. I'm thinking this should be true test if the resistor is working.
Appreciate any help/comments. Thanks