I dropped my fuel tank and removed my sending unit. I put the red lead of my ohm meter on the post where the power wire attaches to the unit and and my black lead to the ground wire on the sending unit. I moved the float arm up and down and my ohm meter hardley moved at all. however when it was hooked up and in the car my fuel guage was reading from full to empty. 5 gallons of gas would send the guage to full. It looks like I need another sending unit. Has anyone been able to get a sending at their local auto parts store or am I going to have to order it from some where else. Thanks Bob. ----- Original Message ----- From: rml...@comcast.net To: "The Chevelle Mailing List" <chevelle-list@chevelles.net> Sent: Saturday, April 10, 2010 6:32:59 AM GMT -05:00 US/Canada Eastern Subject: Re: [Chevelle-list] fuel sending unit
With so many different sending units to choose from that range from 50.00 to 150.00 how am I to know which one I need. Thanks, Bob ----- Original Message ----- From: "ted laidig" <huggerorang...@yahoo.com> To: "The Chevelle Mailing List" <chevelle-list@chevelles.net> Sent: Friday, April 9, 2010 11:27:02 PM GMT -05:00 US/Canada Eastern Subject: Re: [Chevelle-list] fuel sending unit Seems that when I dropped the tank on my "69" I pulled the sending unit out and tested it with an Ohm meter and found a dead spot in it . Think I learned about how to test the sending unit from the Team Chevelle forum. but would go the ground test route first and see what happens. Bear in mind that if your gage is like mine sometimes it takes a little bit to react so be patient. Ted From: Chum Nault <c...@jimolsonmotors.com> To: The Chevelle Mailing List <chevelle-list@chevelles.net> Sent: Fri, April 9, 2010 10:16:40 AM Subject: Re: [Chevelle-list] fuel sending unit Larry The fact that you are reading past full points to a bad ground and I would test that by grounding the sending unit wire directly to the tank ground if your gauge doesn't go to empty then fix the ground. If it goes to empty then it is an open circuit in the sending unit. The easiest way to bench test a gauge is with another sending unit, the sending unit is just a 90 ohm resistor. With the 12volts and ground applied to the gauge hook up a ground wire from the gauge ground to the body of the sending unit and the hook up the gauge wire from the gauge directly to the wire on the sending unit. When you move the float on the sending unit up the gauge should go to full and when it is down it should go to empty. You don't need to find the correct sending unit to do the test as almost all old GM sending units used the same 90 ohm resistance. Chum Nault -----Original Message----- From: chevelle-list-boun...@chevelles.net [mailto: chevelle-list-boun...@chevelles.net ] On Behalf Of Larry Williams Sent: Friday, April 09, 2010 9:55 AM To: The Chevelle Mailing List Subject: Re: [Chevelle-list] fuel sending unit Mine is erratic even after adding a ground. How can you check it on the bench? I have a spare. Larry rml...@comcast.net wrote: > So I restored my dash over the winter, new fuel and temp guage. the > dash turned out great. However, my fuel guage is not accurate. I put 5 > gal. in the tank and it reads past full. If I have to drop the tank to > check my grounds, should I just replace my sending unit. And if so > what sending unit do I need for a 70ss 396. It looks like dropping the > tank is going to be quite a ordeal. I think I am going to have to > partially remove my exhaust. Thanks again yall for your help. Bob
