This is THE video for the old GM fuel gauge issues. Helped me solve the mystery of why my '72 Monte Carlo was always at a qtr tank full when I filled it up. Thanks man.
Perfect timing for this to pop into my feed... currently having this issue with a 51 chevy... only reading 3/4 to full when the sending unit arm is moved... i do have the resistor i just need to wire it in!!! Next will be oil pressure an temp sending units... turn the key on the oil psi jumps right to 100 without the new 350 running water doesn't read at all... new EZwire harness...
Well Chris thank's again. I like how you tell it like it is. I have a red wire from sending unit instead of tan, but common sense. I dont care about over full reading. I care about empty.
Thank you. I like it cause I learned and you are straight forward. Especially when you said if people know what there doing don’t watch the video. 😂 great job. 😂👍
Great explanation. The fuel sending unit in my ‘72 Buick went open so I dropped the tank and installed a new sender. I checked the new sending unit before installing and got 90 ohms full and 1 or 2 ohms empty. Now when the tank is full and spewing gas out of the filler neck the stupid gauge only reads 3/4 full. It always worked fine before the old sending unit went open, guess I’ve gotta see if I have 88-90 ohms at the tan wire in the trunk. If I do is it possible that the gauge resistor has drifted?
Hey Chris perhaps you could lend me your thoughts, 68 chevelle motor swapped to a 70s 454. I had recently purchased a dash lighter just the button. Since my car didn't have 1. When I pushed it in I got nothing an it didn't get warm or anything close to hot, used a screwdriver an cleaned the little round ring in the back of the socket then tried the lighter again this time it got warm but not cherry red hot like it should, so figured I was on the right track. Tried scraping it a little more with the screwdriver an I guess it touched the side metal housing of the lighter socket an threw a spark. Checked the fuses but nothing blew, so tried the lighter again only this time my dash gauge lights came on the turn sig indicators came on solid and my fuel gauge went directly to full. After messing with it all day I started the car pushed in the lighter the dash lights flicked for a sec along with the turn indicators the cig lighter then got cherry red in under 10 seconds, however I now had no dash lights an the fuel gauge stayed on empty. After messing with the small fuse in the fuse box I got my dash lights to work again but my fuel gauge isn't working at all. Do you think it's maybe just a bad ground? I also viewed your video about the voltage regulator since I have that internal type alt an while the car was running the red amp light would stay lit constant so I just unplugged the clip an the gen light went out, do you think that may effect my fuel gauge not working at all I don't but just thought I'd throw it out there.
Found the issue! grounded the light brown wire on the back of the gauge an fuel gauge rose up to half a tank. So just need to figure out where that ground went bad, all the rest of the gauges light up an work..
Excellent video. I have a Question. I am dumb when it comes to electrical. I have a 70 GTO and a new tank sender and new printed circuit on the dash My gas gauge won't read over 1/4 tank. I read online the testing procedures and it said if that occurs the resistor is bad OR it is grounded to the housing. If anything, it's grounded to the housing because I had them out and could EASILY have screwed that up. How can I tell if it's grounded to the housing?
+MrRightwingextreme did you watch the whole video I'm sure I went over that? if it's a ceramic resistor the black shape will be facing out... if you have a wafer it needs to be spaced with washers
Hey man, how’s it going? I have a peculiar situation where my 63 gauge is functioning properly however the sending unit when the float is in the full gas tank position, my gauge shows empty when the float is at the bottom of the gas tank meaning that I’m out of gas my gauge shows full, I can’t reverse the power. It doesn’t work that way I guess I got it wired wrong, but I don’t know how any suggestions please
@@chriscraft77022 no worries. Thanks for confirming that. I was starting to second guess myself. I have a 1970 Camaro with some electrical issues that I'm trying to trace down.
HELP! I just took my entire dash out of my 70 GTO for the second time. Needless to say I do not want to do it again. First, I am starting with my gas gauge. It acts as though it has no resistor. It moves erratically when the car is moved then settles down. I have an orange resistor from the factory which is an 88 ohm resistor. I tested it and it reads 88 ohm. after I install it to the gauge and tighten it and test again it reads 44 ohm. I tried another resistor and it does exactly the same thing 44 ohm. 88 off 44 on. Is that correct? My oil pressure guage measures 88 ohm on or off the gauge.
I'm going to get a replacement gauge. I had one for a 70 GTO W/O rally gauges which is different (larger face) and it reads 88 Ohms before AND after the resistor is screwed down. Plus the needle on mine moves to easily just moving the gauge around which might be why its erratic.
So my question is, why can't you test the sending unit with it in the car? I tried to test mine in under the car the same way and it's giving me a 0 ohm reading.
you can test it on the car.. that would of just of made a horrible video.. you need to crawl under there and make sure you have a good ground on the sending unit.... check the resistance... then add gas to see if it changes... not a good test at all.. 0 ohm is empty.. so did you add gas?
Chris Craft I got it. It's reading 48 ohms so, roughly half a tank. Looks like it's either the wiring or the gauge. Some jackass did some serious hacking to some of the wiring so, that's probably what's causing it. It's a 67 chevelle.
Hi could you tell me why my volt meter is showing 26.4 ohms on full tanking of fuel ,all set up just like you showed 26,4 ohms be for 3 gallons of fuel 24.9 be for thanks rich
I guess my resistor is bad cause my gauge is acting up like yours without a resistor. Thanks again for great info. Do you ask for donations or do you sell hats or T-shirts? Hahaha
This is THE video for the old GM fuel gauge issues. Helped me solve the mystery of why my '72 Monte Carlo was always at a qtr tank full when I filled it up. Thanks man.
How did you solve your problem reading a qtr tank? I have the same issue now.
Man I swear every time I have an issue with my 70chevelle you always have a video for it
I’ve been messing with this fuel gauge for 5 weeks lol thanks man well explained and helped me thanks again
Most informative video yet. Non of the other peoples videos show the wiring info. Thanks !
Awesome no shenanigans video. This helped me troubleshoot my fuel gauge for the old 1970 Monte. Keep up the great work!
Thank you !!!!!! Nobody shows how simple the wiring is!!!! Thanks for making it so easy to understand.
Perfect timing for this to pop into my feed... currently having this issue with a 51 chevy... only reading 3/4 to full when the sending unit arm is moved... i do have the resistor i just need to wire it in!!! Next will be oil pressure an temp sending units... turn the key on the oil psi jumps right to 100 without the new 350 running water doesn't read at all... new EZwire harness...
6 years ago, but it helped me. Tx man!
Great explanation and sound effects
Thanks man. I'm one of those people that did not know, and I appreciate you taking the time to record and explain it.
dude!! you are basically building my car...thanks!!
Great video....for some of us wanting to learn something of their classic car this was informative.
When your gas gauge just goes the opposite does that mean it’s good or it’s bad got to replace itIt goes all the way around
Thanks you for posting a video on this fuel gauge sending unit problem it was very helpful...
I need to know where I can buy or find the resistor you used from 68-69 Chevy? Because the only resistors I find are the ceramic ones that are 86 ohms
Well Chris thank's again. I like how you tell it like it is. I have a red wire from sending unit instead of tan, but common sense. I dont care about over full reading. I care about empty.
Thank you. I like it cause I learned and you are straight forward. Especially when you said if people know what there doing don’t watch the video. 😂 great job. 😂👍
Excellent for the dummies, makes it really clear!!
Great explanation. The fuel sending unit in my ‘72 Buick went open so I dropped the tank and installed a new sender. I checked the new sending unit before installing and got 90 ohms full and 1 or 2 ohms empty. Now when the tank is full and spewing gas out of the filler neck the stupid gauge only reads 3/4 full. It always worked fine before the old sending unit went open, guess I’ve gotta see if I have 88-90 ohms at the tan wire in the trunk. If I do is it possible that the gauge resistor has drifted?
compare it to the old one.. you might have to bend the float down on the sender
Best video Ever I had a bad ground and it was solved mannnn was I stressed
Awesome video. Very very to understand.
Any idea to repair the gauge on its own please?
Thanks.
Hey Chris perhaps you could lend me your thoughts, 68 chevelle motor swapped to a 70s 454. I had recently purchased a dash lighter just the button. Since my car didn't have 1. When I pushed it in I got nothing an it didn't get warm or anything close to hot, used a screwdriver an cleaned the little round ring in the back of the socket then tried the lighter again this time it got warm but not cherry red hot like it should, so figured I was on the right track.
Tried scraping it a little more with the screwdriver an I guess it touched the side metal housing of the lighter socket an threw a spark.
Checked the fuses but nothing blew, so tried the lighter again only this time my dash gauge lights came on the turn sig indicators came on solid and my fuel gauge went directly to full.
After messing with it all day I started the car pushed in the lighter the dash lights flicked for a sec along with the turn indicators the cig lighter then got cherry red in under 10 seconds, however I now had no dash lights an the fuel gauge stayed on empty. After messing with the small fuse in the fuse box I got my dash lights to work again but my fuel gauge isn't working at all.
Do you think it's maybe just a bad ground? I also viewed your video about the voltage regulator since I have that internal type alt an while the car was running the red amp light would stay lit constant so I just unplugged the clip an the gen light went out, do you think that may effect my fuel gauge not working at all I don't but just thought I'd throw it out there.
Found the issue! grounded the light brown wire on the back of the gauge an fuel gauge rose up to half a tank. So just need to figure out where that ground went bad, all the rest of the gauges light up an work..
Thanks so much for the explanation. My '77 Chevy Blazer reads way over full, the needle is pegged on full +++ + Now I have an idea as to what is wrong
sorry just reading this,, if its pegged on full you have hot (full 12v on the ohm side of the gauge) or 12v HOT run to the tan wire somewhere
Hey Chris does this apply on motorcycles
GREAT VIDEO WELL EXPLAINED 👍👍👍
Nice explanaiton, and humorous.
Fuel sending unit in the tank can it short out
Do you know where we can buy a resistor?
Where can buy a fuel gauge resistor for a 87 olds cutlass supreme?
What's it mean when you turn the key on, the needle just jumps a smidgen but stays below the first Mark? I'm a desperate man.
Thanks for the video! Side note, did I hear some Electric Wizard in the background?
Excellent video. I have a Question. I am dumb when it comes to electrical. I have a 70 GTO and a new tank sender and new printed circuit on the dash My gas gauge won't read over 1/4 tank. I read online the testing procedures and it said if that occurs the resistor is bad OR it is grounded to the housing. If anything, it's grounded to the housing because I had them out and could EASILY have screwed that up. How can I tell if it's grounded to the housing?
+MrRightwingextreme did you watch the whole video I'm sure I went over that? if it's a ceramic resistor the black shape will be facing out... if you have a wafer it needs to be spaced with washers
great great information man very helpful video till me how much restore your are use and thanks
how many ohms is the resistance of the gauge
Hey man, how’s it going? I have a peculiar situation where my 63 gauge is functioning properly however the sending unit when the float is in the full gas tank position, my gauge shows empty when the float is at the bottom of the gas tank meaning that I’m out of gas my gauge shows full, I can’t reverse the power. It doesn’t work that way I guess I got it wired wrong, but I don’t know how any suggestions please
Cool video. I thought the sending unit grounded to the frame of the car and not all the way to the gauge.
it grounds to the body of the car... there was no car.. so I had no choice
@@chriscraft77022 no worries. Thanks for confirming that. I was starting to second guess myself. I have a 1970 Camaro with some electrical issues that I'm trying to trace down.
my manual calls for 3ohms full/80ohms empty the replacement unit I received reads 6.5omhs full/82.5 empty will that cause an issue ?
👍you teached me how to do this job correctly appreciated.
Thanks very much for this!
Does the sending unit still send gas even if the wires are not connected?
yes
what if you don't know if your gauge has a resistor. How can you tell? Great video by the way. Thanks
Gluc gluc gluc gluc gluc gluc gluc, that meter must have been thirsty.
Great video I have the same problem in my car
HELP! I just took my entire dash out of my 70 GTO for the second time. Needless to say I do not want to do it again. First, I am starting with my gas gauge. It acts as though it has no resistor. It moves erratically when the car is moved then settles down. I have an orange resistor from the factory which is an 88 ohm resistor. I tested it and it reads 88 ohm. after I install it to the gauge and tighten it and test again it reads 44 ohm. I tried another resistor and it does exactly the same thing 44 ohm. 88 off 44 on. Is that correct? My oil pressure guage measures 88 ohm on or off the gauge.
+MrRightwingextreme I don't know .. try insulating the resistor off the metal base... I have no idea, really
insulating it didn't help. I reversed the two between the oil and gas and they both read 44 ohm when tighten the nuts. so it must be correct. Thanks!
Let me know what you find out in the comments... sorry i couldnt help..
I'm going to get a replacement gauge. I had one for a 70 GTO W/O rally gauges which is different (larger face) and it reads 88 Ohms before AND after the resistor is screwed down. Plus the needle on mine moves to easily just moving the gauge around which might be why its erratic.
So my question is, why can't you test the sending unit with it in the car? I tried to test mine in under the car the same way and it's giving me a 0 ohm reading.
you can test it on the car.. that would of just of made a horrible video.. you need to crawl under there and make sure you have a good ground on the sending unit.... check the resistance... then add gas to see if it changes... not a good test at all.. 0 ohm is empty.. so did you add gas?
Chris Craft I got it. It's reading 48 ohms so, roughly half a tank. Looks like it's either the wiring or the gauge. Some jackass did some serious hacking to some of the wiring so, that's probably what's causing it.
It's a 67 chevelle.
Hi could you tell me why my volt meter is showing 26.4 ohms on full tanking of fuel ,all set up just like you showed 26,4 ohms be for 3 gallons of fuel 24.9 be for thanks rich
Is the sending unit NEW?
Chris Craft hi the sender unit is old
there is your problem.. buy a new one
Chris Craft thanks will need to get one , if you wanted to test a fuel sender in a tank is it the same way witch you show thanks rich
yes the resistance would be the same.. find the tan wire in the trunk harness and test it there.. also inspect the sending unit ground to chassis
Very informative
I guess my resistor is bad cause my gauge is acting up like yours without a resistor.
Thanks again for great info.
Do you ask for donations or do you sell hats or T-shirts?
Hahaha
JUST SUBSCRIBE,, YOU HELP BY WATCHING. I HAVE A DAY JOB. I JUST SHARE MY PROJECTS
Thanks
Didn't see resister
GLUG GLUG GLUG GLUG GLUG GLUG GLUG GLUGGGGGG!!!!