Dumb fuel gauge sender question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Dutch · 09-25-2002, 02:56 PM

My fuel gauge isn't working properly on my in cab tank, 72 K20. It hangs aroun 1/8- 1/4 regardless of fuel level and moves a little from time to time in that range. The truck sat a while before I got it so I'm guesing a gummed up /rusted linkage or the float is rotted off (?)...

I want to pull the sender but I don't want to strong arm it and break anything. My chev service manual calls for a special tool to remove the lock ring. Can I get it apart without one without screwing anything up?

It looks pretty straightforward, but I thought I'd rather ask now than post tomorrow about how I ruined my sender

Thanks!

Gene · 09-25-2002, 03:07 PM

hey dutch, take a dull screwdriver or something small and fairly square like a worn out chisel and tap the raised parts of the retainer ring counterclockwise. I have removed many of these without damaging them using just a regular flat screwdriver. After you remove the sending unit ground it to the tank and work the float up and down and see if the gauge rises and falls. If not the unit is probably gone, I have had to replace mine twice since I bought it 8 years ago. Rust tends to build up in the electrical part inside the tank and thats where it fails, don't think it can be dissasembled and cleaned but I have never tried it?

Southpa · 09-25-2002, 04:35 PM

Your float might have a hole in it so its filled with gas. I fixed mine quite a few years ago with JBWeld. If this is the case, drain the float and give it a light scuffing over the hole area after it has dried. Then apply a thin layer of JBWeld and let it dry thoroughly.
Sticks like sh*t to a blanket and doesn't break down. At least, it hasn't so far.

MStokes · 09-26-2002, 02:38 PM

A while back I was trying to get my fuel gauge working also. Had the problem with the leaky float. Lots of tiny holes around the recessed area where it clips to the sending unit arm. Also, when the tank was full the gauge would read slightly above 1/4. As the fuel level dropped in the tank, the gauge level would drop down to empty. I ended up replacing the gauge and everything works great now.

Dutch · 09-26-2002, 10:25 PM

I appreciate the input! I have gotten home too late to try the suggestions out the last couple days, but I'll let you know how it comes out. I appreciate the help.

09-25-2002, 02:56 PM	#1
Dutch Registered User Join Date: Sep 2002 Location: Leipsic, OH Posts: 81	Dumb fuel gauge sender question My fuel gauge isn't working properly on my in cab tank, 72 K20. It hangs aroun 1/8- 1/4 regardless of fuel level and moves a little from time to time in that range. The truck sat a while before I got it so I'm guesing a gummed up /rusted linkage or the float is rotted off (?)... I want to pull the sender but I don't want to strong arm it and break anything. My chev service manual calls for a special tool to remove the lock ring. Can I get it apart without one without screwing anything up? It looks pretty straightforward, but I thought I'd rather ask now than post tomorrow about how I ruined my sender Thanks! __________________ Dutch 1972 Super Cheyenne K20 1976 MGB 1950 Harley FL 1997 Arctic Cat ZR580 "Maybe if I had a couple less hobbies, I'd have time to enjoy one!"

09-25-2002, 03:07 PM	#2
Gene Registered User Join Date: Aug 2002 Location: Muskogee, Oklahoma Posts: 2,914	hey dutch, take a dull screwdriver or something small and fairly square like a worn out chisel and tap the raised parts of the retainer ring counterclockwise. I have removed many of these without damaging them using just a regular flat screwdriver. After you remove the sending unit ground it to the tank and work the float up and down and see if the gauge rises and falls. If not the unit is probably gone, I have had to replace mine twice since I bought it 8 years ago. Rust tends to build up in the electrical part inside the tank and thats where it fails, don't think it can be dissasembled and cleaned but I have never tried it? __________________ 1971 SWB 4X4 Build BOARD MEMBER #5448 BOOMER SOONER!!!!

09-25-2002, 04:35 PM	#3
Southpa Registered User Join Date: May 2000 Location: Victoria, BC, Canada Posts: 2,410	Your float might have a hole in it so its filled with gas. I fixed mine quite a few years ago with JBWeld. If this is the case, drain the float and give it a light scuffing over the hole area after it has dried. Then apply a thin layer of JBWeld and let it dry thoroughly. Sticks like sh*t to a blanket and doesn't break down. At least, it hasn't so far. __________________ 1970 GMC 1500 Custom Original 350/TH350 Victoria, BC, Canada You can wish in one hand and crap in the other. See which one gets filled first.

09-26-2002, 02:38 PM	#4
MStokes Registered User Join Date: Aug 2002 Location: Meridian, Idaho Posts: 164	A while back I was trying to get my fuel gauge working also. Had the problem with the leaky float. Lots of tiny holes around the recessed area where it clips to the sending unit arm. Also, when the tank was full the gauge would read slightly above 1/4. As the fuel level dropped in the tank, the gauge level would drop down to empty. I ended up replacing the gauge and everything works great now. __________________ 1972 C-10 LWB, 400/350, 2WD 1972 C-20 Custom Camper, 350/350, 4WD (Converted)

09-26-2002, 10:25 PM	#5
Dutch Registered User Join Date: Sep 2002 Location: Leipsic, OH Posts: 81	Thanks, Guys..... I appreciate the input! I have gotten home too late to try the suggestions out the last couple days, but I'll let you know how it comes out. I appreciate the help. __________________ Dutch 1972 Super Cheyenne K20 1976 MGB 1950 Harley FL 1997 Arctic Cat ZR580 "Maybe if I had a couple less hobbies, I'd have time to enjoy one!"



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