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challenger fuel gauge off after installing new sending
#569140
01/01/10 10:48 PM
01/01/10 10:48 PM
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Joined: Jun 2009
Posts: 233
vashon island washington
hunterstroble
OP
enthusiast
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OP
enthusiast
Joined: Jun 2009
Posts: 233
vashon island washington
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I have a 73 challenger. I installed a 3/8" sending unit/pickup and now when my gauge should read half it's close to empty. I figure if I had to I could reattactch my old sending unit. But honestly don't feel like getting covered in gas. Any tricks, can the gauge needle be pulled off and repositioned? Thanks very much everyone!
1969 Dodge dart 500 stroker
1973 Dodge Challenger 440
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Re: challenger fuel gauge off after installing new sending
[Re: 1_WILD_RT]
#569142
01/01/10 11:05 PM
01/01/10 11:05 PM
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Joined: Jun 2009
Posts: 233
vashon island washington
hunterstroble
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Posts: 233
vashon island washington
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it's one I don't even remember where I bought it from, so i can't return it. Probobaly best to order a new one.
1969 Dodge dart 500 stroker
1973 Dodge Challenger 440
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Re: challenger fuel gauge off after installing new sending
[Re: AARCONV]
#569144
01/01/10 11:26 PM
01/01/10 11:26 PM
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Joined: Mar 2003
Posts: 15,491
the boonies
aarcuda
I Live Here
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I Live Here
Joined: Mar 2003
Posts: 15,491
the boonies
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bad ground on the sending unit???
It's got a cop motor, a 440 cubic inch plant, it's got cop tires, cop suspensions, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas.
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Re: challenger fuel gauge off after installing new sending
[Re: aarcuda]
#569145
01/01/10 11:36 PM
01/01/10 11:36 PM
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Joined: Jan 2003
Posts: 21,072
Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,072
Niles , Ohio
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Most of the new aftermarket ones are off some.Most need some adjusting also.I have a SS 3/8 one in my 65.Its off probally less than 1/8 of a tank.I did have to tweek the arm a bit on mine.Even from the factory some were not very accurate.Rocky
Last edited by therocks; 01/01/10 11:37 PM.
Chrysler Firepower
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Re: challenger fuel gauge off after installing new sending
[Re: Snoopy]
#569147
01/02/10 12:05 AM
01/02/10 12:05 AM
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Joined: Jun 2009
Posts: 233
vashon island washington
hunterstroble
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enthusiast
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OP
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Posts: 233
vashon island washington
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the unit body is grounded. And i know has 1/2 tank of gas in it. Old sending unit read 33 ohms near half, new unit in tank reads 33 ohms, but gauge is just above e. spikes to full when i ground the wire. The gauge worked fine before i replaced it, guess i have to pull the new one out and run ut through the scale. I just thought 33 ohms would show alot more than just above e.
1969 Dodge dart 500 stroker
1973 Dodge Challenger 440
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Re: challenger fuel gauge off after installing new sending
[Re: CokeBottleKid]
#569149
01/02/10 11:24 AM
01/02/10 11:24 AM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Sounds like your sending unit ground is bad...
 Check that first.
The proper way to check it is what Snoopy posted. Good post.
Check it with a known good ohm meter before putting it into the tank. If you can't get those readings by bending the float arm or stop, then return it and get another sending unit.
The gauge in the dash has never been off on the cars I've worked on. 
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Re: challenger fuel gauge off after installing new sending
[Re: Challenger 1]
#569150
01/02/10 01:29 PM
01/02/10 01:29 PM
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Joined: Jun 2009
Posts: 233
vashon island washington
hunterstroble
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OP
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Posts: 233
vashon island washington
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My car is not at my house so i'll check it again in a couple days. I'll try running a better ground to my sending unit body, then pull it out if that doesn't work. It's just weird, 33 ohms should be nearly half on my gauge, sure acts like a bad ground though. maybe i'll run a temporary jumper ground to my battery - terminal in the trunk.
1969 Dodge dart 500 stroker
1973 Dodge Challenger 440
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Re: challenger fuel gauge off after installing new sending
[Re: stumpy]
#569152
01/02/10 07:29 PM
01/02/10 07:29 PM
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Joined: Jun 2009
Posts: 233
vashon island washington
hunterstroble
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OP
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Posts: 233
vashon island washington
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it could be bent, i never looked. I just installed it into the new tank and put the whole assembley into the car. I pull it out next weekend and check.
1969 Dodge dart 500 stroker
1973 Dodge Challenger 440
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Re: challenger fuel gauge off after installing new sending
[Re: hunterstroble]
#569153
01/02/10 08:33 PM
01/02/10 08:33 PM
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Joined: Jun 2009
Posts: 233
vashon island washington
hunterstroble
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OP
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Posts: 233
vashon island washington
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The arm was bent and my ohms were all glittchy and all over the map. installed all the sending unit guts from my old pickup onto the new one and wha-la! Thanks for everyone's help.
1969 Dodge dart 500 stroker
1973 Dodge Challenger 440
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Sorry but with as many posts as I've seen about sending unit issues & mt personal experiances... Obviously the problem is with the sender why change anything on the gauge to compensate...
