![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
![]() |
#1 |
stock is where the money
Join Date: Feb 2004
Location: ellis grove, illinois
Posts: 87
|
1972 cst k5 fuel gauge prob
i recently purchased a 72 cst K5 air,tilt, all original body panels with no rust, any way i'm new here and was wondering if anyone has had this problem, my gas guage reads 1/4 tank when full, the guy i got it from said he installed new sending unit from lmc and the new one did the same thing so lmc sent him another one and it also does it, he gave me the 1st new sending unit and the 2nd new one is in it, and the box even says 69-72 blazer sending unit on it. it's not that big of a deal but when you put 35 dollars in gas in it and you drive away and it reads 1/4 it just sucks, any ideas out there maybe guage or ckt bd any suggestions greatly appreciated. thanks brody p.
|
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: Feb 2001
Location: Lake Stevens,WA 98258 North of Seattle
Posts: 833
|
I haven't had the problem myself, but I heard others say to check the ground wire as it needs a clean connection
__________________
Marysville, WA (Dan72cst@hotmail.com) 72 4wd Blazer CST 350/350 72 4wd Chevy LWB 350/350 68 2wd Chevy LWB 327/400 |
![]() |
![]() |
![]() |
#3 |
stock is where the money
Join Date: Feb 2004
Location: ellis grove, illinois
Posts: 87
|
is that the ground wire on the tank or on the back of dash?
|
![]() |
![]() |
![]() |
#4 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
|
Look on the back of your gauge and you will see a small white ceramic block that fits over the gauge studs. (it is called a "shunt") This should read about 82.5 ohms (+ or -)--if not gently clean both sides and recheck--if still no go replace it with one from another gauge or you can order one from this place for $7.95--www.fix-a-gauge.com -- just fixed one in a 72 Cheyenne that was doing the samething.(tried new sender -checked wires and grounds etc. before finding problem.) Remove shunt before checking as it will read thru gauge if checked installed.
www.fix-a-gauge.com
__________________
56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer Last edited by jhow66; 03-04-2004 at 12:49 AM. |
![]() |
![]() |
![]() |
#5 |
stock is where the money
Join Date: Feb 2004
Location: ellis grove, illinois
Posts: 87
|
thanks for the reply will look at the shunt this weekend, i checked the ground yesterday on the tank and it was fine, just got back to see, jhow66 suggestion on the shunt, will check and let you know if it worked thanks again brodyp
|
![]() |
![]() |
![]() |
#6 |
Registered User
Join Date: Nov 2000
Location: Valencia, CA
Posts: 96
|
What's the condition of your circuit board? My bad gauge had damage to its' circuit board and I could never get it to register.
|
![]() |
![]() |
![]() |
#7 |
stock is where the money
Join Date: Feb 2004
Location: ellis grove, illinois
Posts: 87
|
the ckt board looks good i was able to reach up behind the dash and get the nuts off the shunt but there wasn't enough play in the ckt bd to get it off so i could remove the shunt and measure the resistance, i did measure it in the ckt and it read 37.5 ohms, which i know i need to measure it out of the ckt. i tried to remove the screws on the outside of the dash bezel and removed the plate under the steering column and removed the knobs and nuts on the wiper and manual throttle lock but the dash bezel would not budge, i was hoping to replace the bezel with a new one i bought and remove the shunt and measure at the same time but i can't get it out what am i missing???? thanks brody p.
__________________
1972 chevy K5 Blazer a/c, tilt, rust free cal. truck, original body panels 1993 GMC sierra 4x4 swb 60k, buckets, console, 100% stock 1997 chevy tahoe lt 4x4 2dr bone stock 2001 harley fxdwg2 switchblade bone stock 5k miles 1993 corvette ZR1 yellow/grey 1 of 11 yellow, 38k miles 4.10, ported, rippie chip, chambered exhaust 2011 Callaway SC606 Grand Sport Corvette, 13K miles, original Callaway promotional car 1971 Chevy C10 CST SWB 2wd all original paint and interior |
![]() |
![]() |
![]() |
#8 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
|
Did you disconnect the speedo cable--oil pressure gauge line?
__________________
56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
![]() |
![]() |
![]() |
#9 |
stock is where the money
Join Date: Feb 2004
Location: ellis grove, illinois
Posts: 87
|
no i didn't, thanks. i'll try this weekend also is there a trick to getting the light switch out, the knob comes off but the switch doesn't have a nut on the outside like the wiper and manual lock, i'm learning more and more everyday thanks any more input is appreciated, brody p.
__________________
1972 chevy K5 Blazer a/c, tilt, rust free cal. truck, original body panels 1993 GMC sierra 4x4 swb 60k, buckets, console, 100% stock 1997 chevy tahoe lt 4x4 2dr bone stock 2001 harley fxdwg2 switchblade bone stock 5k miles 1993 corvette ZR1 yellow/grey 1 of 11 yellow, 38k miles 4.10, ported, rippie chip, chambered exhaust 2011 Callaway SC606 Grand Sport Corvette, 13K miles, original Callaway promotional car 1971 Chevy C10 CST SWB 2wd all original paint and interior |
![]() |
![]() |
![]() |
#10 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
|
Light switch does not have to be removed just the knob and rod plus the chrome bezel--if you can't unscrew the switch bezel with your hand there are 2 holes in it that you can insert 2 picks in aand use a screwdriver between the 2 to turn it off.
__________________
56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
![]() |
![]() |
![]() |
Bookmarks |
|
|