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#1 |
A guy with a truck
Join Date: Sep 2005
Location: Germany, for now
Posts: 5,920
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Bad Fuel Gauge?
Starting form the top:
- The factory fuel gauge was pegged when I bought the truck (disconnected). - Aftermarket oversize fuel tank. There was an aftermarket sender/gauge setup, that was inaccurate. - I replaced the sender with a 0-90 ohm unit so I could use the factory gauge with the aftermarket tank. Tested sender before install w/ DMM 0 empty, 90 full, and smooth transition between. - Double checked the readings post install, still good - Re-installed tank, w/ new sender, wired an extra ground to be sure, trashed aftermarket gauge, reconnected brown wire to fuse box and went for a fill-up -Filled tank about half full, but gauge reads less than 1/8th? - Pulled brown wire at cluster, ohmmeter shows 42 ohms between wire and ground, which I figure should read just under half on the gauge. Bad gauge? Never had one fail on me, so I'm not sure if this is how it would manifest... Thanks for the help/ideas ![]()
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#2 | |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,713
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Re: Bad Fuel Gauge?
-
Quote:
"also you should ground the fuel plug-in at the fuse panel and check for empty in order to make sure the resistor on the fuel gauge is the correct resistance. key on of course.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#3 | ||
A guy with a truck
Join Date: Sep 2005
Location: Germany, for now
Posts: 5,920
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Re: Bad Fuel Gauge?
Quote:
Quote:
Thanks for the input Posted via Mobile Device
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-Chris Instagram _elgringoloco_ '70 Short-Wide How to: Ruin a perfectly good C10 ‘70 Blazer ConversionHow To: Ruin a Perfectly Good 4wd '72 Highlander How To: Ruin a Perfectly Good K/5 (SOLD) '72 Blazer 2WD How to: Ruin a perfectly good Blazer (SOLD) '05 Yukon Daily Driven (not so stock) Yukon (SOLD) ‘07 Yukon Denali (daily) Members met list: SCOTI, darkhorse970, 67cheby, 67cheby'sGirl, klmore, porterbuilt, n2billet, Fastrucken, classicchev, Col Clank, GSFMECH, HuggerCST, Spray-Bomb, BACKYARD88, 5150, fine69, fatbass, smbrouss70, 65StreetCruiser, GAc10boy |
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#4 | |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,713
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Re: Bad Fuel Gauge?
[quote=gringoloco;5813949]Yes, I set up the new sender arm to be on the bottom of the tank at 0 and at the top at 90. Not sure if this is what you're asking?
Yes that was what I was thinking. Quote:
Being an oversized tank if it was longer than the stock tank then you would be able to put more fuel in it before the gauge registers. Do you have a vehicle with the stock tank you can use the sender in for comparison?
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#5 | ||
A guy with a truck
Join Date: Sep 2005
Location: Germany, for now
Posts: 5,920
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Re: Bad Fuel Gauge?
Quote:
Quote:
I'm still thinking 42 ohms at the fuse box should equate to somewhere around the halfway mark on the gauge?
__________________
-Chris Instagram _elgringoloco_ '70 Short-Wide How to: Ruin a perfectly good C10 ‘70 Blazer ConversionHow To: Ruin a Perfectly Good 4wd '72 Highlander How To: Ruin a Perfectly Good K/5 (SOLD) '72 Blazer 2WD How to: Ruin a perfectly good Blazer (SOLD) '05 Yukon Daily Driven (not so stock) Yukon (SOLD) ‘07 Yukon Denali (daily) Members met list: SCOTI, darkhorse970, 67cheby, 67cheby'sGirl, klmore, porterbuilt, n2billet, Fastrucken, classicchev, Col Clank, GSFMECH, HuggerCST, Spray-Bomb, BACKYARD88, 5150, fine69, fatbass, smbrouss70, 65StreetCruiser, GAc10boy |
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#6 |
Registered User
![]() Join Date: Dec 2012
Location: North Carolina
Posts: 4,989
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Re: Bad Fuel Gauge?
Ah, Post a photo of it ?
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1971 GMC Sierra 1959 GMC 100 |
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#7 | |
A guy with a truck
Join Date: Sep 2005
Location: Germany, for now
Posts: 5,920
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Re: Bad Fuel Gauge?
Quote:
Photo of? Here's what the in-dash gauge reads at 42 ohms. The under-dash gauge in this pic is disconnected. ![]()
__________________
-Chris Instagram _elgringoloco_ '70 Short-Wide How to: Ruin a perfectly good C10 ‘70 Blazer ConversionHow To: Ruin a Perfectly Good 4wd '72 Highlander How To: Ruin a Perfectly Good K/5 (SOLD) '72 Blazer 2WD How to: Ruin a perfectly good Blazer (SOLD) '05 Yukon Daily Driven (not so stock) Yukon (SOLD) ‘07 Yukon Denali (daily) Members met list: SCOTI, darkhorse970, 67cheby, 67cheby'sGirl, klmore, porterbuilt, n2billet, Fastrucken, classicchev, Col Clank, GSFMECH, HuggerCST, Spray-Bomb, BACKYARD88, 5150, fine69, fatbass, smbrouss70, 65StreetCruiser, GAc10boy |
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#8 |
Registered User
![]() Join Date: Dec 2012
Location: North Carolina
Posts: 4,989
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Re: Bad Fuel Gauge?
Well, I thought you had a Bad Fuel Gauge.I wanted to teach myself what things could go wrong for when I get a Truck
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1971 GMC Sierra 1959 GMC 100 |
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#9 |
Registered User
![]() Join Date: Dec 2012
Location: North Carolina
Posts: 4,989
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Re: Bad Fuel Gauge?
alright just wondering
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1971 GMC Sierra 1959 GMC 100 |
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#10 |
Registered User
![]() Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: Bad Fuel Gauge?
Are the gauge and sender linear on a properly working unit?
Is half a tank = half resistance? Posted via Mobile Device
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1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
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#11 |
A guy with a truck
Join Date: Sep 2005
Location: Germany, for now
Posts: 5,920
|
Re: Bad Fuel Gauge?
Stock, I dunno. My aftermarket sender definitely is.
__________________
-Chris Instagram _elgringoloco_ '70 Short-Wide How to: Ruin a perfectly good C10 ‘70 Blazer ConversionHow To: Ruin a Perfectly Good 4wd '72 Highlander How To: Ruin a Perfectly Good K/5 (SOLD) '72 Blazer 2WD How to: Ruin a perfectly good Blazer (SOLD) '05 Yukon Daily Driven (not so stock) Yukon (SOLD) ‘07 Yukon Denali (daily) Members met list: SCOTI, darkhorse970, 67cheby, 67cheby'sGirl, klmore, porterbuilt, n2billet, Fastrucken, classicchev, Col Clank, GSFMECH, HuggerCST, Spray-Bomb, BACKYARD88, 5150, fine69, fatbass, smbrouss70, 65StreetCruiser, GAc10boy |
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#12 |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: Bad Fuel Gauge?
Did you try positioning the float arm "key on" to see if you could get the gauge to follow the float? Your numbers seem to be only the sender resistance. The gauge cycling is a good indicator. With everything buttoned up, can you reach the wiring to remove it and connect a test sender without dropping the tank? Did the float arm contact the bottom of the tank or is the sender the down limit with the float close to the bottom?
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