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10-20-2010, 08:42 PM
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#1 |
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Registered User
Join Date: Aug 2009
Location: Oregon
Posts: 611
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Crazy gas gauge - is it the gauge or the sender?
The gas gauge on my '73 is constantly changing levels regardles of what is in it, even if I'm parked on a level surface. It never pegs completely to one side or the other, so I'm guessing it's not shorting out somewhere.
How do I know if the gauge is bad or the sender in the tank is bad? If the gauge turns out to be bad, can I steal the good one out of my '79?
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'73 K20 Cheyenne Super Camper Special 350/TH350/NP205 sittin' on 33's. You can set my truck on fire and roll it down a hill, and I still wouldn't trade it for a Coupe de Ville. |
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10-20-2010, 09:25 PM
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#2 |
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One shot, one kill.
Join Date: Dec 2007
Location: Saratoga Springs NY
Posts: 859
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Re: Crazy gas gauge - is it the gauge or the sender?
21, A 46 ohm resistor should center guage. I use an old volume control. Wire to sender grounded should read empty. Open circut will go over full. Make sure the tank itself is well grounded. Chances are it's the sender, but dash guages do fail. Don't overlook the wireing under the truck, especially if it has dual tanks. jim
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1984 K20 350M engine with 465,000 miles. Well, it's finally done!! Almost 2 years of work, but it was really worth the effort. Little stuff left to do is mount winch, wet sand & buff out and build belly pan\running boards. Body work takes lots and LOTS of beer!!!! God, Guts and Guns made America and God, Guts and Guns will preserve it! The worst thing you could do is get into my sights, but that don't matter, you'll never know it, cause you'll never hear the shot  Jim or Paladin whichever you choose.
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10-20-2010, 10:41 PM
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#3 |
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Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,071
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Re: Crazy gas gauge - is it the gauge or the sender?
The one in my 74 bounced alot but it appeared to actually be changing w/the level in the tank (fuel slosh when moving down the road). If the truck was sitting still & the gas/liquid was still, the needle was still.
Is your gauge needle moving even if the truck has been perfectly still?
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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10-20-2010, 11:09 PM
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#4 | |
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Registered User
Join Date: Aug 2009
Location: Oregon
Posts: 611
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Re: Crazy gas gauge - is it the gauge or the sender?
Quote:
 It moves a lot but not fast enough to keep up with sloshing.
__________________
'73 K20 Cheyenne Super Camper Special 350/TH350/NP205 sittin' on 33's. You can set my truck on fire and roll it down a hill, and I still wouldn't trade it for a Coupe de Ville. |
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10-20-2010, 11:32 PM
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#5 |
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Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,071
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Re: Crazy gas gauge - is it the gauge or the sender?
Start w/inspecting the ground @the tank.
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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10-20-2010, 11:36 PM
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#6 | |
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Registered User
Join Date: May 2009
Location: Sparks, NV
Posts: 913
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Re: Crazy gas gauge - is it the gauge or the sender?
Quote:
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Greg 1974 GMC 1/2 Ton SWB Fleetside L33 5.3/4l65e .................__
............._____l __\__ ..............l_(O)_ l___(O)] |
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