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B Body Fuel Sending Unit #674843 04/19/10 01:16 PM 04/19/10 01:16 PM
Joined: Jan 2007 Posts: 1,032 Ohio dobie OP super stock
dobie OP super stock Joined: Jan 2007 Posts: 1,032 Ohio	In searching things on the web yesterday, I found out that Right Stuff Detailing now has fuel tank sending units. I currently have their steel brake lines installed, and I've been very happy with them, and their company. Obviously, my current sending unit isn't worth a crap, as it's way off, like everyone else's. It was bought new from Herb's Parts a few years ago. I just installed it last year, and it reads empty all the time. Grounds are good, as I even installed another ground wire to eliminate that problem. Anyways, I called Right Stuff this morning and chatted with their tech guys. Of course, their's is imported as well, but no specific manufacture info could be provided. I had hoped for American made, thinking that finally someone will produce one that will actually work. Anyways, does anyone here have one of the Right Stuff's sending units? I'm hoping for a good/bad/indifferent review of actual experience with one. Thanks! 1968 Plymouth Road Runner 383 4 speed

Re: B Body Fuel Sending Unit [Re: dobie] #674844 04/19/10 02:19 PM 04/19/10 02:19 PM
Joined: Sep 2005 Posts: 6,516 Santa Cruz, California L Lefty master
Lefty master L Joined: Sep 2005 Posts: 6,516 Santa Cruz, California	Quote: I just installed it last year, and it reads empty all the time. Something else is wrong. I've never seen senders be more than 1/4 tank off the correct reading. Check the ohms, it should read between 10-90 ohms.

Re: B Body Fuel Sending Unit [Re: Lefty] #674845 04/19/10 02:36 PM 04/19/10 02:36 PM
Joined: Mar 2006 Posts: 346 indiana M mopar mike enthusiast
mopar mike enthusiast M Joined: Mar 2006 Posts: 346 indiana	if the ground was bad, i beleive it should be reading way past full?? you could have a grounded wire to the sender??

Re: B Body Fuel Sending Unit [Re: Lefty] #674846 04/19/10 02:51 PM 04/19/10 02:51 PM
Joined: Jan 2007 Posts: 1,032 Ohio dobie OP super stock
dobie OP super stock Joined: Jan 2007 Posts: 1,032 Ohio	Quote: Quote: I just installed it last year, and it reads empty all the time. Something else is wrong. I've never seen senders be more than 1/4 tank off the correct reading. Check the ohms, it should read between 10-90 ohms. What else would be wrong then? With all of the posts here and on other boards, it appeared that most new aftermarket sending units read incorrectly. The first one I had in the tank was off too. I don't know any of the history on that one, but it's safe to say that it wasn't the original one. As far as checking ohms, I have no clue how to do that. I have a cheapie Craftsman multimeter, but have no clue on what setting I should be using, or where to test things. I'm a complete newbie and idiot on checking electrical things. 1968 Plymouth Road Runner 383 4 speed

Re: B Body Fuel Sending Unit [Re: mopar mike] #674847 04/19/10 02:55 PM 04/19/10 02:55 PM
Joined: Jan 2007 Posts: 1,032 Ohio dobie OP super stock
dobie OP super stock Joined: Jan 2007 Posts: 1,032 Ohio	Quote: if the ground was bad, i beleive it should be reading way past full?? you could have a grounded wire to the sender?? I have a reproduction part sending unit ground strap installed. It runs from the nipple on the sender to the metal fuel line. It's the metal band with the 2 alligator type clips on both ends. I've tried taking it off, connecting it on other areas, it all makes no difference whether one is installed or not. All of my other factory gauges work fine. I've never tested the gauge itself, but with it being installed in the dash, there's no way I'm pulling it out just to test it at this point. If that's the case, I guess I'll just live with it for awhile. Last edited by dobie; 04/19/10 02:56 PM. 1968 Plymouth Road Runner 383 4 speed

Re: B Body Fuel Sending Unit [Re: dobie] #674848 04/19/10 03:07 PM 04/19/10 03:07 PM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	To test the gauge go to any electronics supply even Radio Shack may be able to help.. Get a 75 Ohm resistor & a 10 ohm resistor.. Together you should spend considerably less than $5.00 Connect the 10 ohm resistor to the wire going to the sending unit.. Ground the other end of the resistor.. Turn the ignition on, the gauge should read full... Now try the 75 ohm resistor, the gauge should read empty... If it passes both these tests look for a shop (like Instrument Specialties) to rewind your original Sending Unit...

Re: B Body Fuel Sending Unit [Re: Lefty] #674849 04/19/10 03:31 PM 04/19/10 03:31 PM
Joined: Jan 2007 Posts: 1,032 Ohio dobie OP super stock
dobie OP super stock Joined: Jan 2007 Posts: 1,032 Ohio	Quote: Quote: I just installed it last year, and it reads empty all the time. Something else is wrong. I've never seen senders be more than 1/4 tank off the correct reading. Check the ohms, it should read between 10-90 ohms. This is the multimeter I have. Obviously I'd use the ohms stuff, but what setting do I set the dial at, and where should the leads be placed on the car/sending unit? http://www.sears.com/shc/s/p_10153_12605_03482141000P?keyword=multimeter 1968 Plymouth Road Runner 383 4 speed

Re: B Body Fuel Sending Unit [Re: dobie] #674850 04/19/10 04:06 PM 04/19/10 04:06 PM
Joined: Jan 2007 Posts: 953 Badham Co. Y Y3 70 BEE super stock
Y3 70 BEE super stock Y Joined: Jan 2007 Posts: 953 Badham Co.	Last summer I did a comparison of a old factory 5/16 unit and the nowhere near accurate 3/8 Spectra that was in the car. I installed the old 5/16 and drove around and the gauge was working correctly. So I put the Spectra back in till this weekend when I performed surgery. I took note of where the float should sit then I cut the Spectra sending unit off the pick up with a hacksaw and the same to the factory pick up and cut the wire and or strap. Then I took 2 small gear type hose clamps and trimmed the sides so they would slid thru the slots in the factory sending unit and attached the factory sending unit to the Spectra pick up and connected them with the hose clamps and connected the factory type wire to the Spectra strap. No welding or soldering you will have to adjust where you clamp it together so the sending unit sits properly. Make sure the sending unit wire where you crimp them together does not touch the pick up anywhere and that the hose clamps are positioned so you can get the pick up in the tank. I only have one pic of where I cut the Spectra off at. 5935244-DCFN0002.JPG (671 downloads)

Re: B Body Fuel Sending Unit [Re: dobie] #674851 04/19/10 04:13 PM 04/19/10 04:13 PM
Joined: Sep 2005 Posts: 6,516 Santa Cruz, California L Lefty master
Lefty master L Joined: Sep 2005 Posts: 6,516 Santa Cruz, California	Quote: Quote: Quote: I just installed it last year, and it reads empty all the time. Something else is wrong. I've never seen senders be more than 1/4 tank off the correct reading. Check the ohms, it should read between 10-90 ohms. This is the multimeter I have. Obviously I'd use the ohms stuff, but what setting do I set the dial at, and where should the leads be placed on the car/sending unit? http://www.sears.com/shc/s/p_10153_12605_03482141000P?keyword=multimeter Set it on the 200 ohms scale. Test the meter by touching the two test leads together and make sure you're seeing less than 1.00 ohm. If that test passes, put one lead on the body of the sender and one lead on the terminal you connect the wire that goes to the gauge. With the sender arm at each end of it's operating range you should see the 10-90 ohm sweep on the meter.

Re: B Body Fuel Sending Unit [Re: Lefty] #674852 04/19/10 06:14 PM 04/19/10 06:14 PM
Joined: Jan 2007 Posts: 1,032 Ohio dobie OP super stock
dobie OP super stock Joined: Jan 2007 Posts: 1,032 Ohio	Thanks for the help! The sender is in the tank of course, and I was kinda hoping not to remove it, yet again... Oh well. 1968 Plymouth Road Runner 383 4 speed

Re: B Body Fuel Sending Unit [Re: 1_WILD_RT] #674853 04/19/10 08:40 PM 04/19/10 08:40 PM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	Well then.. Try this to pinpoint the problem... Quote: To test the gauge go to any electronics supply even Radio Shack may be able to help.. Get a 75 Ohm resistor & a 10 ohm resistor.. Together you should spend considerably less than $5.00 Connect the 10 ohm resistor to the wire going to the sending unit.. Ground the other end of the resistor.. Turn the ignition on, the gauge should read full... Now try the 75 ohm resistor, the gauge should read empty... If it passes both these tests look for a shop (like Instrument Specialties) to rewind your original Sending Unit...

Re: B Body Fuel Sending Unit [Re: 1_WILD_RT] #674854 04/19/10 08:46 PM 04/19/10 08:46 PM
Joined: Jan 2007 Posts: 1,032 Ohio dobie OP super stock
dobie OP super stock Joined: Jan 2007 Posts: 1,032 Ohio	I certainly will. I plan on going to Radio Shack in the morning. Thanks! 1968 Plymouth Road Runner 383 4 speed

Re: B Body Fuel Sending Unit [Re: dobie] #674855 04/19/10 08:54 PM 04/19/10 08:54 PM
Joined: Jan 2007 Posts: 953 Badham Co. Y Y3 70 BEE super stock
Y3 70 BEE super stock Y Joined: Jan 2007 Posts: 953 Badham Co.	I don t no who makes a accurate sending unit I think the ones Dixie Restoration parts sell may be the real deal. Definitely check out everything before you throw parts at it.

Re: B Body Fuel Sending Unit [Re: Y3 70 BEE] #674856 04/19/10 10:03 PM 04/19/10 10:03 PM
Joined: Jul 2007 Posts: 464 Detroit Michigan stinger mopar
stinger mopar Joined: Jul 2007 Posts: 464 Detroit Michigan	maybe to much resistance in the factory wire?if the sending unit tests good before installation then what?

Re: B Body Fuel Sending Unit [Re: stinger] #674857 04/19/10 10:15 PM 04/19/10 10:15 PM
Joined: Jan 2007 Posts: 953 Badham Co. Y Y3 70 BEE super stock
Y3 70 BEE super stock Y Joined: Jan 2007 Posts: 953 Badham Co.	What I cant answer is that both the original and Spectra both were in spec at empty and full according to the factory manual using a ohmmeter. All I know is the old mopar sending works correctly and the Spectra never was even close.

Re: B Body Fuel Sending Unit [Re: Y3 70 BEE] #674858 04/19/10 10:32 PM 04/19/10 10:32 PM
Joined: Jul 2007 Posts: 464 Detroit Michigan stinger mopar
stinger mopar Joined: Jul 2007 Posts: 464 Detroit Michigan	this seems to be a common problem that everyone has with these after market senders.I remember reading somewhere that someone ran new wire from the sender to gauge and that solved the problem.larger gauge new wire should have less resistance in it then the old wire.I have a new aftermarket sending unit that I have not installed yet and been thinking about this for awhile now.

Re: B Body Fuel Sending Unit [Re: Lefty] #674859 04/20/10 07:21 AM 04/20/10 07:21 AM
Joined: Jan 2003 Posts: 21,147 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,147 Niles , Ohio	Mopars go empty when no ground.Hook a long ground wire to batt and to the sender wire.Turn on key and see if gauge goes full.If not you have a problem with power to sender or bad gauge.Rocky Chrysler Firepower

Re: B Body Fuel Sending Unit [Re: therocks] #674860 04/20/10 09:50 AM 04/20/10 09:50 AM
Joined: Jan 2007 Posts: 1,032 Ohio dobie OP super stock
dobie OP super stock Joined: Jan 2007 Posts: 1,032 Ohio	Ok, the car is jacked up on stands now. Went to Radio Shack this morning and got a 10 ohm resistor. Looks like I'd need to solder it though. No clue on how to accomplish that. Right now, the easiest seems to be the ground wire Rocky suggested. I got that ready to go and will update accordingly. I only have about 7-10 gallons in the tank right now, so I'm wondering if that matters when I try the ground wire. Or, maybe grounding as suggested somehow overrides things and will cause the gauge to go to full..?? One thing I might add, the gauge seems to work, somewhat. On a full tank the needle goes to 1/2 tank, then drops quickly to empty. Never really seen it go much over 1/2 tank. Not sure what that might indicate. 1968 Plymouth Road Runner 383 4 speed

Re: B Body Fuel Sending Unit [Re: dobie] #674861 04/20/10 10:32 AM 04/20/10 10:32 AM
Joined: Jan 2003 Posts: 21,147 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,147 Niles , Ohio	Take the power off the sender attach the ground from batt.Turn on key and gauge should peg.Just dont leave it on too long.Rocky Chrysler Firepower

Re: B Body Fuel Sending Unit [Re: therocks] #674862 04/20/10 11:22 AM 04/20/10 11:22 AM
Joined: Jan 2007 Posts: 1,032 Ohio dobie OP super stock
dobie OP super stock Joined: Jan 2007 Posts: 1,032 Ohio	No Sir, the needle didn't move one bit. Just to make sure, hook one side to the positive terminal and the other to the sending unit itself, or the blue wire going to the sending unit? Last edited by dobie; 04/20/10 11:35 AM. 1968 Plymouth Road Runner 383 4 speed

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