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06-29-2009, 12:26 PM
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#1 |
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Registered User
Join Date: Oct 2007
Location: greeneville tn
Posts: 237
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Fuel guage prob 49 gmc
I have a friend who has just completed a 49 gmc using an S10 chassis engine ,trans . Everything works great except his fuel guage .He had the orignal guages redone telling them he was using the S10 fuel tank and fuel injected engine . Any ideas as what might be wrong ? thanks in advance
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06-29-2009, 01:12 PM
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#2 |
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Registered User
Join Date: Jun 2006
Location: Idaho
Posts: 8,800
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Re: Fuel guage prob 49 gmc
Most obvious cause is sending unit amperage. Older trucks used a 0-90 ohm range, newer vechicle are 75-300 ohm range. Using a newer sending unit with older guage will cause it to peg at full until you fall below 90 ohms which is when you have about 1 gallon of fuel left. When they restored the guages they may not have modifed them for the new amperage.
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1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread 1964 Chevelle Malibu w/ 355-350TH (daily driver) Helpful AD and TF Manual Site Old Car Manual Project |
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06-29-2009, 02:51 PM
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#3 |
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Registered User
Join Date: Mar 2008
Location: Waukee, Iowa
Posts: 1,608
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Re: Fuel guage prob 49 gmc
So do AD trucks use the 0-90 ohm sending unit?
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build threads: 86 Suburban 88 Jeep 6.0 swap 49 Chevy truck 54 Chevy wagon 86 Suburban lowered 4/6 54 Chevy wagon 49 Chevy/s10 mix 88 Jeep Wrangler rockcrawler |
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06-29-2009, 05:18 PM
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#4 |
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Hollister Road Co.
Join Date: Apr 2005
Location: Houston
Posts: 6,131
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Re: Fuel guage prob 49 gmc
My first guess would be that the sender is 12 volt and the gauge is 6 volt
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06-29-2009, 06:49 PM
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#5 | |
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Registered User
Join Date: Jun 2006
Location: Idaho
Posts: 8,800
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Re: Fuel guage prob 49 gmc
Quote:
__________________
1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread 1964 Chevelle Malibu w/ 355-350TH (daily driver) Helpful AD and TF Manual Site Old Car Manual Project |
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06-30-2009, 08:25 AM
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#6 |
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Registered User
Join Date: Oct 2007
Location: greeneville tn
Posts: 237
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Re: Fuel guage prob 49 gmc
Guages were completley upgraded for 12 volts and the 4.3 fuel injected engine . Somthing could have been missed but assuming it wasent anymore ideas ?
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06-30-2009, 11:31 AM
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#7 | |
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Registered User
Join Date: Jun 2006
Location: Idaho
Posts: 8,800
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Re: Fuel guage prob 49 gmc
Quote:
__________________
1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread 1964 Chevelle Malibu w/ 355-350TH (daily driver) Helpful AD and TF Manual Site Old Car Manual Project |
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06-30-2009, 10:38 PM
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#8 |
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Senior Member
 
Join Date: Jun 2002
Location: Kansas
Posts: 702
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Re: Fuel guage prob 49 gmc
I'm not sure, but I don't think you can change the "Ohms" of a given gage. Your 49 GMC gage is a 0-30 Ohm gage, possibly converted to 12 volts, but I bet you'll need to use a after market 0-30 Ohm sending unit to make it work correctly.
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The kid Build threads: 51 Jimmy http://67-72chevytrucks.com/vboard/s...d.php?t=154951 http://67-72chevytrucks.com/vboard/s...d.php?t=219902 http://www.classictrucks.com/feature...uck/index.html 68 C10 http://67-72chevytrucks.com/vboard/s...ad.php?t=50348 |
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07-01-2009, 06:14 PM
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#9 |
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Registered User
Join Date: Oct 2007
Location: greeneville tn
Posts: 237
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Re: Fuel guage prob 49 gmc
Thanks for all the help. Kid got it right .Ohms sending unit problem . He was using S10 fuel tank .
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