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Username Post: Fuel gauge fluctuations        (Topic#345824)
5Larry7 
"15th Year" Gold Supporting Member
Posts: 1941
5Larry7
Loc: Dallas, TX
Reg: 05-17-04
07-04-17 07:27 PM - Post#2698758    

I have a '57 Chevy that has an Auto Meter fuel gauge. I have a Tanks EFI fuel tank with an sender that is rated at the proper resistance for the gauge. It works fine until I turn on the headlights, then drops; for example if it was reading just over half a tank, it drops to below 1/4 tank. If I turn the headlights off, it goes back to the previous reading. The tank is grounded to the frame and the headlights are wired through relays as they were pretty dim and now are bright. Any ideas and help will be appreciated. Larry

'57 210, 327 cid, Holley MPFI, 700R4, A/C & more.
'51 Studebaker Starlite coupe, 350, TH400, GV OD.
'96 Replica of a 1950's Teardrop Trailer.


Edited by 5Larry7 on 07-04-17 07:36 PM. Reason for edit: No reason given.

 




raycow 
Honored Member
Posts: 27764
raycow
Loc: San Francisco, CA
Reg: 11-26-02
07-05-17 11:36 AM - Post#2698837    
    In response to 5Larry7

Rotate the headlight switch knob so as to turn off the cluster lighting. Does this make any difference in how the gauge reads?

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
acardon 
Ultra Senior Member
Posts: 11057
acardon
Loc: DFW TEXAS
Reg: 03-25-05
07-05-17 04:38 PM - Post#2698866    
    In response to 5Larry7

Check the ground wire on the gauge at both ends.

Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


 
5Larry7 
"15th Year" Gold Supporting Member
Posts: 1941
5Larry7
Loc: Dallas, TX
Reg: 05-17-04
07-05-17 08:46 PM - Post#2698907    
    In response to acardon

  • acardon Said:
Check the ground wire on the gauge at both ends.



Quote: Rotate the headlight switch knob so as to turn off the cluster lighting. Does this make any difference in how the gauge reads?

I will try both of these suggestions and let you know the resutls. Thanks


'57 210, 327 cid, Holley MPFI, 700R4, A/C & more.
'51 Studebaker Starlite coupe, 350, TH400, GV OD.
'96 Replica of a 1950's Teardrop Trailer.


Edited by 5Larry7 on 07-05-17 08:47 PM. Reason for edit: No reason given.

 
WagonMan 
"8th Year" Silver Supporting Member
Posts: 1622
WagonMan
Age: 70
Loc: Las Vegas, NV
Reg: 10-26-04
07-05-17 10:23 PM - Post#2698911    
    In response to 5Larry7

Do you have the battery grounded to the frame also? Everything else is grounded through the body. Try a long temporary jumper wire directly from the tank to the battery negative and check again.

Charles

57 210 4dr. Wagon(bought '82)
-350/700r4 Mild Custom
56 BA 4dr. ht.(bought '98)
-265/TH350 Mostly Stock
29 Ford Sedan(bought '75)
-4.3L/TH350(in progress)


 
5Larry7 
"15th Year" Gold Supporting Member
Posts: 1941
5Larry7
Loc: Dallas, TX
Reg: 05-17-04
07-06-17 12:56 PM - Post#2698973    
    In response to raycow

  • raycow Said:
Rotate the headlight switch knob so as to turn off the cluster lighting. Does this make any difference in how the gauge reads?

Ray



I tried this, (headlights on), and the fuel quantity does in fact change when I rotate the headlight switch. Full clockwise increases the amount, counter clockwise reduces it. Full clockwise on the switch does not bring the quantity up to the level as when the headlights are off. Thanks for the tip. I will double check the grounds on the gauge.


'57 210, 327 cid, Holley MPFI, 700R4, A/C & more.
'51 Studebaker Starlite coupe, 350, TH400, GV OD.
'96 Replica of a 1950's Teardrop Trailer.


 
5Larry7 
"15th Year" Gold Supporting Member
Posts: 1941
5Larry7
Loc: Dallas, TX
Reg: 05-17-04
07-06-17 12:59 PM - Post#2698974    
    In response to WagonMan

  • WagonMan Said:
Do you have the battery grounded to the frame also? Everything else is grounded through the body. Try a long temporary jumper wire directly from the tank to the battery negative and check again.



Yes, I have lots of grounds; battery to engine, battery to frame, engine to frame, frame to body and etc. But I will pull the gauge module and see how I grounded the fuel gauge, it has been long enough I do not remember. Thanks for the tip.


'57 210, 327 cid, Holley MPFI, 700R4, A/C & more.
'51 Studebaker Starlite coupe, 350, TH400, GV OD.
'96 Replica of a 1950's Teardrop Trailer.


 
monty56 
"15th Year" Gold Supporting Member
Posts: 1403
monty56
Loc: Chandler(it's a dry heat)...
Reg: 04-26-04
07-07-17 07:19 AM - Post#2699083    
    In response to 5Larry7

The ground for the fuel gauge is at the tank. Check to see where you picked up the "hot" 12v from. Almost seems like you tapped into the "dash lights" by mistake.

Monty
'56 3100 Short Stepside Someday
2001 Chevy Suburban 2500
2009 Saturn Vue w/20's

Member: Desert Classic Chevy's Inc.
Monty's 56 Truck
Avatar is my Truck


 
acardon 
Ultra Senior Member
Posts: 11057
acardon
Loc: DFW TEXAS
Reg: 03-25-05
07-07-17 12:29 PM - Post#2699107    
    In response to monty56

  • Quote:
The ground for the fuel gauge is at the tank.



It's an Autometer aftermarket gauge that requires a ground. The gauge does not ground to the dash like a stock gauge.

Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


 
monty56 
"15th Year" Gold Supporting Member
Posts: 1403
monty56
Loc: Chandler(it's a dry heat)...
Reg: 04-26-04
07-08-17 09:26 AM - Post#2699208    
    In response to acardon

I have an autometer gauge in my truck but didn't know it grounded separately. It is part of the whole gauge cluster.

Monty
'56 3100 Short Stepside Someday
2001 Chevy Suburban 2500
2009 Saturn Vue w/20's

Member: Desert Classic Chevy's Inc.
Monty's 56 Truck
Avatar is my Truck


 
5Larry7 
"15th Year" Gold Supporting Member
Posts: 1941
5Larry7
Loc: Dallas, TX
Reg: 05-17-04
07-12-17 02:15 PM - Post#2699807    
    In response to monty56

Update: I connected an additional ground wire to the mounting bracket for the gauge as per Auto Meter and that seems to have cured the problem.

'57 210, 327 cid, Holley MPFI, 700R4, A/C & more.
'51 Studebaker Starlite coupe, 350, TH400, GV OD.
'96 Replica of a 1950's Teardrop Trailer.


 




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