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Old 02-13-2014, 06:13 PM   #1
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Gas Gauge.

Gas gauge on my 87 almost disappears way past full when the key is turned on. With the key off it is just above full. Thinking I need a new sending unit I dropped the tank. With the tank out of the car, wires unplugged, all lines disengaged the gauge does the same. The sending unit with a ohm meter attached was all over the place. Little over 14 ohms with the float down and open line with the float up. Propped the float up midway and the ohm meter read from 14 up to over 70 without moving the float. Going to replace the sending unit anyway and the pump will I got the tank down. Taking the cluster out tomorrow to check the gauge. Anyone ever run into any thing like this? Any suggestions on what other checks I should do wile Its apart? Speedo dose not work either.
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Old 02-13-2014, 09:41 PM   #2
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My gas gauge does the same thing in my 90'. It only gets accurate with about a 1/4 of a tank left. And my speedo cable is jumpy around 30-45 mph. But these things dot really bother me that much, so I'm not planning to fix them any time soon.

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Old 02-14-2014, 09:36 PM   #3
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Removed the cluster and removed the gas gauge out of the cluster. Hooked up the sending unit, gas gauge and a 6 volt battery. Lifted the float and the gauge went to full, lowered the float and the gauge went to E. So it works out of the car but not in. Voltage reg looks like its been out before. There is a black cover over the circuit board part of the regulator and half of that cover is broke off. Either that or some bad wires has to be the problem. Hooked a cordless drill up to the speed o and it worked fine. Either the gear or the cable is bad. Thinking about running a extra ground wire to the subframe from the sending unit when I reinstall the tank. Would that be a good idea?
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Old 02-16-2014, 01:44 PM   #4
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Thats the voltage regulator on back of the cluster. I'm used to working on HVAC systems, not cars, so any thoughts would be appreciated.
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Old 02-16-2014, 02:29 PM   #5
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If it looks like this then you're talking about the anti-slosh module.
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Old 02-16-2014, 05:31 PM   #6
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Quote:
Originally Posted by ALMOST STOCK View Post
If it looks like this then you're talking about the anti-slosh module.
Yeap, thats it, half of that black cover is gone on mine also half of the numbers on that pad are gone to. Not sure how to test that bad boy.
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Old 02-16-2014, 10:02 PM   #7
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I'm not sure either how you would test it.
I do know that a new 87-89 Anti-Slosh Module is no longer available but you can still get the 90-93.
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Old 02-20-2014, 04:20 PM   #8
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I'm not sure either how you would test it.
I do know that a new 87-89 Anti-Slosh Module is no longer available but you can still get the 90-93.
Round a anti slosh module on ebay. Bought it for 30 bucks. Dont know if thats a fair price or not. Ohm'd my wires running to the tank and found no problems so I put every thing back together with new pump, sending unit, newer module and a extra ground wire from the sending unit to a body ground. plugd the tank in while it is sitting on the floor. Turned the key on and the gauge reads empty. Did try to ohm the module comparing the readings with my old one but every reading was almost identical on both modules. Any way at least its reading empty with no gas in the tank. Thanks everyone for the help.
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