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09-25-2005, 11:47 AM
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#1 |
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-Chris
 
Join Date: Sep 2002
Location: Moyock, NC
Posts: 622
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Autometer fuel guage
I put all new autometer guages in my 70 and all guages work except the fuel gauge.
When the tank is full the gauge reads "1/2". My truck gets around 200 miles to the tank, when the tank is around 1/2 full at 100 miles, the gauge reads "full". Im just curious to see if anyone has any answers or suggestions to this. thanks for the help.
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1970 Chevy C-10 P/U, Shortbed, Fleetside - 5/7 drop, 496, TH400, 12 bolt. BUILD THREAD - http://67-72chevytrucks.com/vboard/s...d.php?t=404481 2012 F250 Super Duty P/U - intake, exhaust, tuner, 4" lift with 35's 2017 Chevy Suburban (Wifes Car) - Fully Loaded & Stock "Some people spend an entire lifetime wondering if they made a difference in the world. But, the Marines don't have that problem." Ronald Reagan, President of the United States; 1985 |
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09-25-2005, 12:06 PM
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#2 |
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Registered User
Join Date: Feb 2001
Location: East Central, MO
Posts: 11,336
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Do you have the right one? There are two different sending units depending on the year of the sending unit you have.
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09-25-2005, 12:14 PM
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#3 |
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-Chris
Join Date: Sep 2002
Location: Moyock, NC
Posts: 622
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as far as i know the sending unit i have is the original 1970 sending unit. is there a way to check? I thought about the fact that it might be the sending unit, but the guage is reading smoothly but just not in the right direction. If the float was bad on the sending unit, wouldnt the gauge not read at all? As far as the directions told me, the gauge is hooked up properly to the sending unit.
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1970 Chevy C-10 P/U, Shortbed, Fleetside - 5/7 drop, 496, TH400, 12 bolt. BUILD THREAD - http://67-72chevytrucks.com/vboard/s...d.php?t=404481 2012 F250 Super Duty P/U - intake, exhaust, tuner, 4" lift with 35's 2017 Chevy Suburban (Wifes Car) - Fully Loaded & Stock "Some people spend an entire lifetime wondering if they made a difference in the world. But, the Marines don't have that problem." Ronald Reagan, President of the United States; 1985 |
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09-25-2005, 12:21 PM
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#4 |
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Registered User
Join Date: Feb 2001
Location: Wetumpka, Al, U.S.
Posts: 8,892
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not wrong sending unit wrong gauge
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Kevin Special Thanks to All who have helped on the TRUCK! My Pass Time Show http://s129.photobucket.com/albums/p...Chapter1-0.mp4 So Far my best Times are: Motor only: 6.44 1/8 @ 104.13 10.39 1/4 @ 125.83 Nitrous Times: 5.785 1/8 @ 118.65 with a 1.336 60ft 9.168 1/4 @ 142.58 with a 250 shot dead out of the hole! |
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09-25-2005, 12:25 PM
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#5 |
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Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,948
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are you sure u got the gauge for a gm sending unit which is 0-90ohms
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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09-25-2005, 12:45 PM
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#6 |
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Registered User
Join Date: Feb 2001
Location: East Central, MO
Posts: 11,336
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There are two different guages and sending units for Chevy. The two will work if mixed but not right.
Last edited by Mudder; 09-25-2005 at 12:45 PM. |
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09-25-2005, 12:51 PM
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#7 |
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-Chris
Join Date: Sep 2002
Location: Moyock, NC
Posts: 622
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oh ok, ill have to look into that one. I remeber the gauge being a 0-90 ohms gauge though. Ill have to check that out though. thanks guys
__________________
1970 Chevy C-10 P/U, Shortbed, Fleetside - 5/7 drop, 496, TH400, 12 bolt. BUILD THREAD - http://67-72chevytrucks.com/vboard/s...d.php?t=404481 2012 F250 Super Duty P/U - intake, exhaust, tuner, 4" lift with 35's 2017 Chevy Suburban (Wifes Car) - Fully Loaded & Stock "Some people spend an entire lifetime wondering if they made a difference in the world. But, the Marines don't have that problem." Ronald Reagan, President of the United States; 1985 |
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09-25-2005, 02:19 PM
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#8 |
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Registered User
Join Date: Apr 2000
Location: Bradenton, FL
Posts: 1,036
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Did you use the wire that comes from the fuse box or did you use the wire that comes from thank. If you use the wire from the fuse box it wont work you need to use the wire from the tank. Just some simple info.
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1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters |
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09-25-2005, 04:07 PM
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#9 |
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saving one more
Join Date: Sep 2005
Location: Pryor Creek, Oklahoma
Posts: 3,066
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Just a thought, I have replaced the tank in my truck with an under bed aluminum tank from Classic Performance. My fuel gauge was reading backwards after replacing the tank. Classic Perform says they had a few bad sending unit sent out that read backwards, I got one. If you have replaced the tank, you may want to check into this. I checked the resitance at the tank for the fuel sender with the tank full, it should be 90 ohms, mine was reading 4 ohms. You can also check the guage by unhooking the sending unit wire. With that wire grounded to the truck, the guage should read empty (0 ohms resitance) and with the wire not touchng anything, it should bury the guage, way past full (infinite resitance)
Hope this helps
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72 Chevy longbed - now for parts 69 Chevy short fleet - needing some love 70 RS Camaro - needing more love driver - 96 GMC X-cab Last edited by rauto13; 09-25-2005 at 04:08 PM. |
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09-25-2005, 04:53 PM
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#10 |
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Account Suspended
Join Date: Feb 2004
Posts: 3,051
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One other thing: if you read the Autometer install instructions, it states that the gauge MUST be grounded to the sending unit.
Most will run the guage to a common ground and have it screw up. |
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