Fuel Gauge Help - Pirate4x4.Com : 4x4 and Off-Road Forum

dasouthards · 06-05-2010, 09:20 AM

I am trying to install my new dash with all new gauges, but I've hit a snag with my fuel gauge. The gauge goes to full tank no matter how much gas is in the tank. I have a 1982 CJ-7 with stock fuel tank and sending unit. I thought it was the sending unit so I bought a new one, but when I hooked it up, I get the same problem at the gauge. The gauge I am using is an Autometer 2642. It has a sender range of 73 ohms when empty and 10 ohms when full. Is this the wrong gauge for my Jeep or am I missing something along the way?

BrokeOkie · 06-05-2010, 11:56 AM

I don't have a clue but I'm having the same problem. I'm still using my factory gauge though. I replaced my sending unit when I replaced my tank and it still doesn't work.

atblis · 06-05-2010, 07:46 PM

Hook a multimeter to the wire from the sending unit that plugs into your gauge. Measure the resistance. If that reads correct-->something is up with gauge. Also, make sure you don't have the + and - switched around on the back of the gauge.

The trick to trouble shooting is to isolate parts of the system for test. A multimeter is your friend.
________
Volcano Classic Vaporizer

06-05-2010, 09:20 AM	#1 (permalink)
dasouthards Registered User Join Date: Mar 2006 Member # 68658 Posts: 41	Fuel Gauge Help I am trying to install my new dash with all new gauges, but I've hit a snag with my fuel gauge. The gauge goes to full tank no matter how much gas is in the tank. I have a 1982 CJ-7 with stock fuel tank and sending unit. I thought it was the sending unit so I bought a new one, but when I hooked it up, I get the same problem at the gauge. The gauge I am using is an Autometer 2642. It has a sender range of 73 ohms when empty and 10 ohms when full. Is this the wrong gauge for my Jeep or am I missing something along the way?

06-05-2010, 07:46 PM	#3 (permalink)
atblis Registered User Join Date: May 2005 Member # 46937 Posts: 2,356	Hook a multimeter to the wire from the sending unit that plugs into your gauge. Measure the resistance. If that reads correct-->something is up with gauge. Also, make sure you don't have the + and - switched around on the back of the gauge. The trick to trouble shooting is to isolate parts of the system for test. A multimeter is your friend. ________ Volcano Classic Vaporizer Last edited by atblis; 08-12-2011 at 03:24 AM.

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06-05-2010, 11:56 AM	#2 (permalink)
BrokeOkie Registered User Join Date: May 2010 Member # 161151 Posts: 7	I don't have a clue but I'm having the same problem. I'm still using my factory gauge though. I replaced my sending unit when I replaced my tank and it still doesn't work.