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08-22-2016, 12:02 AM
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#1 |
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Registered User
 Join Date: Oct 2013
Location: Ripley TN
Posts: 57
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Fuel sending unit?
I bought a brand new 21 gallon fuel tank and matching sending unit for my 69 blazer from brothers truck parts and I have a new cluster from lmc. The issue I am having is I can fill the tank full of fuel and the gauge will read exactly full and it will go down just fine but when the fuel gauge is showing empty it will only hold about 14 gallons to fill it back up so something is not correct. Has anyone had this issue or does anyone know what could possibly be wrong?
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08-22-2016, 05:26 AM
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#2 |
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Registered User
Join Date: Nov 2008
Location: Rose Hill Ks
Posts: 290
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Re: Fuel sending unit?
Maybe the gadge itself has a defect
__________________
1970  Jimmy 4x4 IL61971 Jimmy 4x4 350ci v81971  SWB 327ci v81972 Short Stepside 305ci v81972 Blazer 2WD CST LS9 350ci 4sp1999 4 Door LB 1 Ton Old Body Style 5.7 v8
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08-22-2016, 09:01 AM
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#3 |
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Senior Member
Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,707
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Re: Fuel sending unit?
maybe they sold you a 14 gallon tank. what are the dimensions on your tank
__________________
Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim |
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08-22-2016, 09:36 AM
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#4 |
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2WD Jimmy
Join Date: Mar 2005
Location: Davis County, Utah
Posts: 2,565
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Re: Fuel sending unit?
You might want to post this question in the electrical forum as well.
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08-22-2016, 10:43 AM
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#5 |
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Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Fuel sending unit?
If you unplug the sensor does it go beyond full? If you short that wire to ground does it go below E? But if I had to guess, I'd say the resistance of the imported sending unit is not quite the same as the factory unit.
__________________
My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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08-22-2016, 05:52 PM
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#6 |
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Registered User
Join Date: Oct 2013
Location: Ripley TN
Posts: 57
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Re: Fuel sending unit?
My tank dimensions are 26x16x13 which comes out to be 22 gallons when you figure up the dimensions so it is a 21 gallon tank so something has to be wrong with the sending unit or the gauge itself. I was just trying to see if anyone else has had this same issue with there new sending unit or cluster before I tore into it deeper to try to figure out the problem.
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08-23-2016, 09:41 AM
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#7 |
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Registered User
Join Date: Mar 2015
Location: Ontario Canada
Posts: 1,523
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Re: Fuel sending unit?
To me, it sounds like the sender has the wrong resistance value for that particular gauge. I would check the actual resistances from the fuel sender when empty and full with an ohm meter, then check the part number of the gauge to see if it's compatible.
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