intermittent fuel gauge problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bigjimzlll · 09-09-2002, 12:08 AM

Hi,
My fuel gauge stoped working months ago, I decided to fix it. I took the wire off the sending unit, and the gauge went to full, I grounded the gauge wire, and the gauge went to empty, so I figured it was the sending unit. I removed the unit and tested it, it worked properly(0-90 ohms) the float looked great. re installed and hooked it up, and it worked great. I hate not knowing how I fixed it. Now every now and again. it goes to empty...and then its back to normal again.. any ideas?

*Zkast* · 09-09-2002, 12:11 AM

If its going to empty, your wire is grounding out somewhere between the sender and the gauge. If you had a bad sender it would go open (guage goes past full).

Trace the sending unit wire from the sender. You'll probably find a short near the door sill plate. Just guessing of course.

O'l Buck · 09-09-2002, 12:19 AM

i'm guessing the insulation is broke somewhere and when you unhooked the wire, you moved it just enough for it to lose the contact with the unwanted ground it had, now it's bouncing back into the spot again......check the wire good.

09-09-2002, 12:08 AM	#1
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	intermittent fuel gauge problem Hi, My fuel gauge stoped working months ago, I decided to fix it. I took the wire off the sending unit, and the gauge went to full, I grounded the gauge wire, and the gauge went to empty, so I figured it was the sending unit. I removed the unit and tested it, it worked properly(0-90 ohms) the float looked great. re installed and hooked it up, and it worked great. I hate not knowing how I fixed it. Now every now and again. it goes to empty...and then its back to normal again.. any ideas? __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

09-09-2002, 12:19 AM	#3
O'l Buck Recovering Truck Driver Join Date: Mar 2002 Location: Orleans, NE USA Posts: 1,883	i'm guessing the insulation is broke somewhere and when you unhooked the wire, you moved it just enough for it to lose the contact with the unwanted ground it had, now it's bouncing back into the spot again......check the wire good. __________________ 67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska

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09-09-2002, 12:11 AM	#2
Zkast Account Suspended Join Date: May 2002 Location: Olathe, Kansas Posts: 929	If its going to empty, your wire is grounding out somewhere between the sender and the gauge. If you had a bad sender it would go open (guage goes past full). Trace the sending unit wire from the sender. You'll probably find a short near the door sill plate. Just guessing of course.



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