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Re: 3/8 FUEL TANK UNIT CORRECT FOR 68 CORONET R/T 440?
[Re: FJ5_Fish]
#420350
07/27/09 03:29 PM
07/27/09 03:29 PM
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Joined: Nov 2003
Posts: 247
BAREFOOT BEACH SOUTHWEST FL
HEMIBULLITT
OP
super street
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OP
super street
Joined: Nov 2003
Posts: 247
BAREFOOT BEACH SOUTHWEST FL
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Quote:
The 69 440 B-Bodies all had a 3/8" sending unit with a 5/16" fuel line.....I don't have a 68 to check but I'll check with someone who does.
Thanks fish, any help is greatly appreciated! I've had a few 68 B Bodys over the years and am getting too old to remember all the vital stats on em anymore!
Cheers
Steve
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Re: 3/8 FUEL TANK UNIT CORRECT FOR 68 CORONET R/T 440?
[Re: 1_WILD_RT]
#420352
07/27/09 05:40 PM
07/27/09 05:40 PM
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Joined: Nov 2003
Posts: 247
BAREFOOT BEACH SOUTHWEST FL
HEMIBULLITT
OP
super street
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OP
super street
Joined: Nov 2003
Posts: 247
BAREFOOT BEACH SOUTHWEST FL
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Quote:
5/16 is correct but upgrading to 3/8 certainly wouldn't hurt anything... 
Thanks Wild R/T I believe the fuel line is 5/16 & also thought it should be 3/8. My Charger has 3/8 line and sender but it is the HEMI I know, just seems like I remember the Magnum 440 Cars having the same 3/8 fuel lines.......hate gettin old.
Steve
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Re: 3/8 FUEL TANK UNIT CORRECT FOR 68 CORONET R/T 440?
[Re: 1_WILD_RT]
#420354
07/27/09 06:25 PM
07/27/09 06:25 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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be prepared for the new sending unit not to work 100%. it wont go to full, only 3/4 the way full.  im on my 4th sending unit from every retailer who sells them. unless something im doing wrong, it wont show full. 
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Re: 3/8 FUEL TANK UNIT CORRECT FOR 68 CORONET R/T 440?
#420355
07/27/09 06:36 PM
07/27/09 06:36 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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Quote:
be prepared for the new sending unit not to work 100%.
it wont go to full, only 3/4 the way full.
im on my 4th sending unit from every retailer who sells them.
unless something im doing wrong, it wont show full.
I've been through that... Next time I think I'm going to try having the original rebuilt...
https://board.moparts.org/ubbthreads/show...rue#Post5360196
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Re: 3/8 FUEL TANK UNIT CORRECT FOR 68 CORONET R/T 440?
[Re: 1_WILD_RT]
#420356
07/27/09 07:44 PM
07/27/09 07:44 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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i pulled mine out 7 different times and went through at least 14 keystone clamps, i tried everything to get it to work. what i dont understand, i plugged in the sending unit switch wire to the unit, turned on the ignition switch, flipped up the lever and it read full on the gauge, i go and installed it and all i can get is 3/4 full with a totally full tank.
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Re: 3/8 FUEL TANK UNIT CORRECT FOR 68 CORONET R/T 440?
#420358
07/27/09 07:56 PM
07/27/09 07:56 PM
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Joined: Mar 2005
Posts: 1,549
Seattle, WA
375inStroke
Special needs person
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Special needs person
Joined: Mar 2005
Posts: 1,549
Seattle, WA
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Quote:
be prepared for the new sending unit not to work 100%.
it wont go to full, only 3/4 the way full.
im on my 4th sending unit from every retailer who sells them.
unless something im doing wrong, it wont show full.
I'd start checking things that can be checked. My replacement worked the first time. This article has some useful information. Mopar Gauges It says "Most problems relate to the fuel gauge sender, which should read 61 to 85 ohms ‘empty’, and 8.6 to 10.6 ohms ‘full’ If the sender is within these specs, the ground at the tank strap is in place (fig. 2), and the wiring, right up to the gauge, is okay, then the gauge itself is shot."
I'd check the resistance when full. After doing something about the gas (I'd drive it almost empty) remove the sender and see if it can move full up. There are tabs that limit max deflection that can be bent for calibration purposes. See if you can get the resistance down to the 9 volt range. If that's good, you can bend the arm down. I don't think this is the problem, but if it is, reading empty when empty is more important than reading full when full.
If the sender reads good, check for low resistance from the back of the sender to the car body.
If everything's good so far, and the other gauges work fine, then it's probably the gauge. There are adjustments inside them for calibration.
Last edited by 375inStroke; 07/27/09 07:56 PM.
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Re: 3/8 FUEL TANK UNIT CORRECT FOR 68 CORONET R/T 440?
[Re: 1_WILD_RT]
#420361
07/28/09 11:10 AM
07/28/09 11:10 AM
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Joined: Aug 2005
Posts: 1,294
Ontario, Canada
FJ5_Fish
pro stock
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pro stock
Joined: Aug 2005
Posts: 1,294
Ontario, Canada
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Quote:
Hemi got 3/8ths.. 440 got 3/8ths later.. For sure in 70, I didn't think 69 got it, I know the A12 440-6 cars only had 5/16 but they were based on converted 383 cars so...
BTW I have a 68 Coronet R/T vert.. 440/727 car...
Yup - 70 was the year the 440 got the 3/8" fuel line to go with the 3/8" sender they already had in 69.
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Re: 3/8 FUEL TANK UNIT CORRECT FOR 68 CORONET R/T 440?
[Re: 1_WILD_RT]
#420362
07/28/09 01:07 PM
07/28/09 01:07 PM
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Joined: Mar 2005
Posts: 1,549
Seattle, WA
375inStroke
Special needs person
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Special needs person
Joined: Mar 2005
Posts: 1,549
Seattle, WA
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Quote:
Yeah but when you bend the arm to only hit 7.0" it will now not read empty when it reaches the bottom of the tank...
I don't think you can say this with certainty. I bent mine a bit and get full when full and empty when empty.
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Re: 3/8 FUEL TANK UNIT CORRECT FOR 68 CORONET R/T 440?
[Re: 1_WILD_RT]
#420363
07/29/09 12:05 AM
07/29/09 12:05 AM
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Joined: Nov 2003
Posts: 247
BAREFOOT BEACH SOUTHWEST FL
HEMIBULLITT
OP
super street
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OP
super street
Joined: Nov 2003
Posts: 247
BAREFOOT BEACH SOUTHWEST FL
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Quote:
Hemi got 3/8ths.. 440 got 3/8ths later.. For sure in 70, I didn't think 69 got it, I know the A12 440-6 cars only had 5/16 but they were based on converted 383 cars so...
BTW I have a 68 Coronet R/T vert.. 440/727 car...
Thanks for all the great feedback! Here is a pic before we start the surgery. I ordered a 3/8 sender and will adjust the float level as needed!
Steve
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