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#1 |
Registered User
![]() Join Date: Mar 2018
Location: Bakersfield, CA
Posts: 308
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Is my gas gauge working correctly??
I think it’s working, but thought it would read higher. My new to me 70 gmc lwb 1/2t 350/350 had a half done blazer rear tank swap when I got it. I think I have everything hooked up right etc. when I first got the truck when started I “think” I remember the gauge going way to the right. Found neither sender wire (ground or the brown wire) were hooked up. I hooked them up but only had like an inch of gas. At that point the gauge read a bit below E. Today I finall got time to get 5 gallons in it. Now it reads about 1/8?? Thought it would read more like 1/4 since I “think” it’s a 21 gallon tank.
Thoughts? |
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#2 |
Senior Member
![]() Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,722
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Re: Is my gas gauge working correctly??
I think it looks good. You'll have more information when you do a fill up. I bought a nice clean new wooden dowel from the lumber store to dip in the tank and see how much gas I had and compared the reading on that to the gas gauge. I did that for a while through the whole range of full to empty. Just to get a feel for the situation.
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#3 | |
Registered User
![]() Join Date: Mar 2018
Location: Bakersfield, CA
Posts: 308
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Re: Is my gas gauge working correctly??
Quote:
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#4 |
Senior Member
![]() Join Date: Dec 1999
Location: Spring Valley, Ca.
Posts: 1,112
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Re: Is my gas gauge working correctly??
Suggestion: Vent to both sides of the tank. The guy who installed mine just did the vent on the passenger side and it is a pain in the ___ to fill. Am having the vent hose added on the nipple on the drivers side as well. So it will vent faster when filling it up.
__________________
Smitty '71 Short Fleetside Spring Valley, Ca. |
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#5 |
Registered User
![]() Join Date: Mar 2018
Location: Bakersfield, CA
Posts: 308
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Re: Is my gas gauge working correctly??
I’m planning on only doing the drivers side. The large 1/2” vent line right next to filler on the tank. Planning to run that up into fender.
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#6 |
Registered User
![]() Join Date: Mar 2018
Location: Bakersfield, CA
Posts: 308
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Re: Is my gas gauge working correctly??
I'm not sure which are vents and which are supply lines on mine. I believe at least one of the small ones is for fuel injected engines. So the lines may go to bottom of tank instead of just venting at the top. Pretty sure the big one next to fill is main vent though.
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#7 |
Senior Member
![]() Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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Re: Is my gas gauge working correctly??
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#8 |
Senior Member
![]() Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,722
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Re: Is my gas gauge working correctly??
Are you all using roll over valves?
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#9 |
Registered User
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 2,177
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Re: Is my gas gauge working correctly??
You could pop for a new sender, and make sure all the grounds are good and clean.
__________________
"Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC |
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#10 |
Registered User
![]() Join Date: Mar 2018
Location: Bakersfield, CA
Posts: 308
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Re: Is my gas gauge working correctly??
I grounded to the tank bolt that bolts tank to the frame. Looks like it’s moving so I’m guessing it is good. I’m gonna keep adding fuel as I can get to the gas station. Maybe have it full soon.
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#11 |
Registered User
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 2,177
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Re: Is my gas gauge working correctly??
Good ground at the cab to frame and cluster to cab?
__________________
"Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC |
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#12 |
Registered User
![]() Join Date: Mar 2018
Location: Bakersfield, CA
Posts: 308
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Re: Is my gas gauge working correctly??
No idea if those grounds are good or not. Wouldn’t a bad ground just cause it not to work at all?? It’s working, it’s going up when I add gas. I just wasn’t sure if it’s eyeball accurate.
I’m done troubleshooting it for now (too many other things to do). Once it’s full if it’s not reading full, I’ll get back to testing things. |
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#13 |
Senior Member
![]() Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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Re: Is my gas gauge working correctly??
Ok , You know the gauge is moving when more fuel added raised the gauge level . just remove the tank pick up and straighten the float rod a bit to make the gauge move up ,you may have to adjust more than once to get it close , with a 21 gallon tank that you added 8 gallons to it should be just below 1/2 on the gauge. carry a small gas in back and drive the truck until it reads empty . the small can of gas is in case it runs out . don't chase electrical gremlins when a simple adjustment of the rod will do the trick !
![]() Last edited by Grumpy old man; 05-18-2018 at 07:15 PM. |
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#14 |
Registered User
![]() Join Date: Mar 2018
Location: Bakersfield, CA
Posts: 308
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Re: Is my gas gauge working correctly??
Put another 4+ gallons in. It’s moving up so it’s working. Just not sure how accurate it is. I’d guess about 8 gallons in a 21 gallon tank.
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