sending unit problems - Team Camaro Tech
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post #1 of 5 (permalink) Old Mar 18th, 06, 04:44 PM Thread Starter
68C
 
Join Date: Feb 2005
Location: Florida
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sending unit problems

Had trouble w/my orig. sending unit(gauge was reading way past full causing it to run outta gas near 1/4 tank). So decided to replace sending unit & tank. Both new ones are after market purchased from Nat'l Parts Depot. Here's the prob. I'm having...Put 2 gals in & gauge stayed on Empty. Figured after putting in 14 more gals. it would then register but it stayed on "E"...About 4 miles later I turned a corner & I watched the gauge go to full. Woke up this morning, turned on the key & it's staying on "E" again. Any ideas? For the record, it still has about 16 gal's left in the tank. Thanks, 68C

'68 Mike
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post #2 of 5 (permalink) Old Mar 18th, 06, 08:24 PM
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Jim
 
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Re: sending unit problems

You may need to ground your sending unit.
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post #3 of 5 (permalink) Old Mar 18th, 06, 08:33 PM
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Jim
 
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Re: sending unit problems

Quote:
Originally Posted by go2fast
You may need to ground your sending unit.
Negative.
If the sender did not have a proper ground connection, the guage would float past full.
What you have is a short to ground on the wire from the guage to the sender, before the sender.
Test: Disconnect the tan wire from the connector in the rear, center of the trunk.
If the guage floats way past full, then the tan wire is grounding to the sheetmetal between that point and the gas tank. The most likely cause is the locking ring for the sender not being centered quite right, it's touching the connection and shorting the sender. It's also possible that the wire got pinched when you installed the gas tank.

If you check the sticxkies at the top of electrical, there is an excellent article on troubleshooting the fuel guage circuit.





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post #4 of 5 (permalink) Old Mar 19th, 06, 05:19 AM Thread Starter
68C
 
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Re: sending unit problems

Jim, Thanx for that info...the brown wire is shorted. I thought from the beginning I could have trouble w/this wire because the connection on the new sending unit is larger than the original. I had to flare out the connection on the tan wire to get it to slide over the connection unit. Heading out to NPD to get spare to have on hand when I drop the tank.
Thanks, 68C

'68 Mike
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post #5 of 5 (permalink) Old Mar 19th, 06, 05:36 PM Thread Starter
68C
 
Join Date: Feb 2005
Location: Florida
Posts: 22
Re: sending unit problems

Hi all, Wanted to let you know I dropped tha tank, re-connected the positive wire, made sure the locking ring didn't slip, & all appears to be well. One thing to note...the positive connection on my after market sending unit, is larger than the connection on the brown wire from the trunk. Not sure if they are all like that but that may have been some of the problem. Thanks, 68C

'68 Mike
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