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Sending Unit - Best Place to Buy and Questions #1013512 06/14/11 10:20 PM 06/14/11 10:20 PM
Joined: Jul 2003 Posts: 1,212 Canton, Ohio Crazy68Dart OP pro stock
Crazy68Dart OP pro stock Joined: Jul 2003 Posts: 1,212 Canton, Ohio	I am seeing a fairly significant range of prices. Looking for a sending unit for the Dart, 1/2" pickup. Thanks. I see there is an offering with a 1/4" return, but only offered in 3/8". The 1/4" return would be nice as I need a 1/4" return from the pressure regulator to help fight off vapor lock. How do you guys typically handle this? Drill the sending unit or return into the fill tube somehow? The latter seems like it might not be a great idea... hmm. Also, 1/2" may be overkill. I would guess 3/8" could supply lots of HP. Last edited by Crazy68Dart; 06/14/11 10:43 PM. 383, Hemi 4-Speed, AlterKtion, D60

Re: Sending Unit - Best Place to Buy and Questions [Re: Crazy68Dart] #1013513 06/14/11 11:06 PM 06/14/11 11:06 PM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	The factory used 5/16" up to low po 440's and 3/8" for high po 440's and Hemi's so 3/8" will run a lot of power. It does depend somewhat on setup - for example mechanical or electrical pump. I've gotten sending units from Mancini - 3/8" with 1/4" return. Just about all of them need the sender tweaked to get a somewhat accurate fuel guage reading.

Re: Sending Unit - Best Place to Buy and Questions [Re: ahy] #1013514 06/15/11 01:20 AM 06/15/11 01:20 AM
Joined: Feb 2010 Posts: 18,493 Granite Bay CA Kern Dog Striving for excellence
Kern Dog Striving for excellence Joined: Feb 2010 Posts: 18,493 Granite Bay CA	Has the quality improved at all? I have read many times that people had exactly the same problems that I have....FULL tank, guage reads 5/8 to 3/4. Half tank, guage reads 1/4. 1/4 tank of fuel, guage rests on the E line. This is terrible.

Re: Sending Unit - Best Place to Buy and Questions [Re: Kern Dog] #1013515 06/15/11 07:29 AM 06/15/11 07:29 AM
Joined: Jul 2003 Posts: 1,212 Canton, Ohio Crazy68Dart OP pro stock
Crazy68Dart OP pro stock Joined: Jul 2003 Posts: 1,212 Canton, Ohio	Quote: Has the quality improved at all? I have read many times that people had exactly the same problems that I have....FULL tank, guage reads 5/8 to 3/4. Half tank, guage reads 1/4. 1/4 tank of fuel, guage rests on the E line. This is terrible. Wow, after market piece with quality issues, there is a surprise.... not what I wanted to hear. Anyone have any luck modifying the stock unit, removing the line, and replacing with larger? 383, Hemi 4-Speed, AlterKtion, D60

Re: Sending Unit - Best Place to Buy and Questions [Re: Crazy68Dart] #1013516 06/15/11 08:14 AM 06/15/11 08:14 AM
Joined: Oct 2009 Posts: 217 Owosso, Michigan S stateroadhog enthusiast
stateroadhog enthusiast S Joined: Oct 2009 Posts: 217 Owosso, Michigan	bought mine from 521 resterations. Called and asked about calibration told me they were all checked to be accurate. Well same problem reads 3/4 when full, reads 1/2 with just 5 gals gone. Is there a fix for this?

Re: Sending Unit - Best Place to Buy and Questions [Re: Crazy68Dart] #1013517 06/15/11 08:34 AM 06/15/11 08:34 AM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	what's the build? 5/16 line is fine for most applications. I've seen cars run way into the 11's w/ 5/16 line and mechanical pumps. [IMG]http://i66.tinypic.com/pui5j.jpg[/IMG] Coming soon!!!!

Re: Sending Unit - Best Place to Buy and Questions [Re: stateroadhog] #1013518 06/15/11 11:34 AM 06/15/11 11:34 AM
Joined: May 2005 Posts: 416 Franklin Co. Illinois runinonmt mopar
runinonmt mopar Joined: May 2005 Posts: 416 Franklin Co. Illinois	Quote: bought mine from 521 resterations. Called and asked about calibration told me they were all checked to be accurate. Well same problem reads 3/4 when full, reads 1/2 with just 5 gals gone. Is there a fix for this? If this continues to get worse I would suspect a sinking float. I also got mine from 521 Restorations. When I got mine I checked it myself. It was within factory spec. When finished I put in 2 1/2 Gals. of gas and drove to the station where I added 5 more. Read just under half full. Time to check up the line. A common problem is resistance or shorts in the connectors and wiring. Be sure the ground strap is properly connected to CLEAN metal. Check continuity from the sending unit wire to the back of the gauge. Also check for resistance to ground with the sender and gauge wires unhooked. A high resistance short here would make the gauge read high.The gauge cluster voltage regulator is usually either good or bad. If you'd like to reda more: http://www.allpar.com/history/mopar/electrical2.html Hope this is helpful Ron Last edited by runinonmt; 06/15/11 11:39 AM. In sixty-five I was seventeen and running up one-o-one I don't know where I'm running now, I'm just running on Jackson Browne-Running On Empty

Re: Sending Unit - Best Place to Buy and Questions [Re: runinonmt] #1013519 06/15/11 12:10 PM 06/15/11 12:10 PM
Joined: Jan 2004 Posts: 1,249 North Carolina 4 469runner pro stock
469runner pro stock 4 Joined: Jan 2004 Posts: 1,249 North Carolina	I bought one from Dixie Restoration parts in Acworth, GA It reads perfectly. I understand they are getting theirs from the orginal supplier.

Re: Sending Unit - Best Place to Buy and Questions [Re: Mr.Yuck] #1013520 06/15/11 08:07 PM 06/15/11 08:07 PM
Joined: Jul 2003 Posts: 1,212 Canton, Ohio Crazy68Dart OP pro stock
Crazy68Dart OP pro stock Joined: Jul 2003 Posts: 1,212 Canton, Ohio	Quote: what's the build? 5/16 line is fine for most applications. I've seen cars run way into the 11's w/ 5/16 line and mechanical pumps. A very stock 383 for now to get the car back on the road, but have the majority of the parts for a 496" low deck stroker in the range of 600-650 hp. I have 1/2" aluminum fuel line that I am going to run along with 1/4" aluminum for the return. Mechanical RacePumps pump with their regulator which has an idle bleed return. 383, Hemi 4-Speed, AlterKtion, D60

Re: Sending Unit - Best Place to Buy and Questions [Re: runinonmt] #1013521 06/15/11 09:24 PM 06/15/11 09:24 PM
Joined: Oct 2009 Posts: 217 Owosso, Michigan S stateroadhog enthusiast
stateroadhog enthusiast S Joined: Oct 2009 Posts: 217 Owosso, Michigan	Okay sending unit reads 10.6 on the full which makes my gauage go to the full mark. Sender reads 80 on against the empty stop gauge reads empty. Great Now is where it gets intresting with sending unit reading 47.5 it just moves gauge off empty mark with 5 gals in tank, add 5 gals at 34.8 ohms gauge now reads 1/4 tank, add 6 gals total of 16gals get reading of 19.4 ohms gauge reads between 1/2 and 3/4. I don't think I can get 3 more gallons in tank so I'm saying its close to full because gas is up into fill tube. So first is even if I could get 3 more gallons in it that shouldn't take gauge from between 1/2 and 3/4 to full or take ohm reading from 19.4 to 10.6. Honstly I think its phased wrong or its wrong unit for Plymouth 19 gallon tank. All I do know is the old sending unit which came from Mancini was right on the money. Which makes me think this unit is just phased wrong. What are your thoughts?

Re: Sending Unit - Best Place to Buy and Questions [Re: stateroadhog] #1013522 06/15/11 10:06 PM 06/15/11 10:06 PM
Joined: Jul 2003 Posts: 1,212 Canton, Ohio Crazy68Dart OP pro stock
Crazy68Dart OP pro stock Joined: Jul 2003 Posts: 1,212 Canton, Ohio	The issue with a fuel gauge is that they are not linear. What needs to be accurate is when it is full (at least close), but more importantly when they are empty. I think between these points anything is "fair game". http://auto.howstuffworks.com/fuel-gauge.htm 383, Hemi 4-Speed, AlterKtion, D60

Re: Sending Unit - Best Place to Buy and Questions [Re: Crazy68Dart] #1013523 06/15/11 10:11 PM 06/15/11 10:11 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: Anyone have any luck modifying the stock unit, removing the line, and replacing with larger? Been alot of (reported) probs whenever the issue comes up. I just got a new spectra tank from Frankie Mitchell on eGay (cheap/fast esp considering his rep from decades ago) & I'm gonna weld a bung on the front vertical side at the bottom & feed it from that plus another bung for a drain plug & just find a good stock 5/16" sender for the gauge. They do peg past F when the rheostat gets submerged when you fill up past a certain point and I'm not so concerned w "F" accuracy but close to E I want it dead on but w a good stock unit it's a moot point live every 24 hour block of time like it's your last day on earth

Re: Sending Unit - Best Place to Buy and Questions [Re: Crazy68Dart] #1013524 06/15/11 10:35 PM 06/15/11 10:35 PM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	Quote: Quote: Has the quality improved at all? I have read many times that people had exactly the same problems that I have....FULL tank, guage reads 5/8 to 3/4. Half tank, guage reads 1/4. 1/4 tank of fuel, guage rests on the E line. This is terrible. Wow, after market piece with quality issues, there is a surprise.... not what I wanted to hear. Anyone have any luck modifying the stock unit, removing the line, and replacing with larger? The basic process for adding a larger pickup is to remove the old and drill out the hole a little undersize for the new tube. Then use a drift to enlarge the hole so it makes a small flange or raised area to grip the new tube tightly. Then solder in with a high power iron or torch. I've never done it... and don't plan to try but that is the basic approach.

Re: Sending Unit - Best Place to Buy and Questions [Re: Crazy68Dart] #1013525 06/16/11 09:20 AM 06/16/11 09:20 AM
Joined: Oct 2009 Posts: 217 Owosso, Michigan S stateroadhog enthusiast
stateroadhog enthusiast S Joined: Oct 2009 Posts: 217 Owosso, Michigan	I agree need to know when empty. Full is a mute point. My problem when gauge reads empty I have at least 7 to 8 gals left.

Re: Sending Unit - Best Place to Buy and Questions [Re: Kern Dog] #1013526 06/16/11 09:44 AM 06/16/11 09:44 AM
Joined: Dec 2004 Posts: 5,278 San Jose, California D DennisH Vacation
DennisH Vacation D Joined: Dec 2004 Posts: 5,278 San Jose, California	Quote: Has the quality improved at all? I have read many times that people had exactly the same problems that I have....FULL tank, guage reads 5/8 to 3/4. Half tank, guage reads 1/4. 1/4 tank of fuel, guage rests on the E line. This is terrible. Same here, new tank and unit.

Re: Sending Unit - Best Place to Buy and Questions [Re: DennisH ] #1013527 06/16/11 01:53 PM 06/16/11 01:53 PM
Joined: Jul 2003 Posts: 1,212 Canton, Ohio Crazy68Dart OP pro stock
Crazy68Dart OP pro stock Joined: Jul 2003 Posts: 1,212 Canton, Ohio	Hmm, maybe I'll weld a sump to my brand new tank and use the 5/16" as the return off the original sending unit. At least I know the thing works, at least it did 9 years ago when I pulled the car apart. 383, Hemi 4-Speed, AlterKtion, D60

Re: Sending Unit - Best Place to Buy and Questions [Re: DennisH ] #1013528 06/16/11 02:37 PM 06/16/11 02:37 PM
Joined: Nov 2008 Posts: 1,565 tennessee P pushbutton pro stock
pushbutton pro stock P Joined: Nov 2008 Posts: 1,565 tennessee	Quote: Quote: Has the quality improved at all? I have read many times that people had exactly the same problems that I have....FULL tank, guage reads 5/8 to 3/4. Half tank, guage reads 1/4. 1/4 tank of fuel, guage rests on the E line. This is terrible. Same here, new tank and unit. Mine reads the same.

Re: Sending Unit - Best Place to Buy and Questions [Re: pushbutton] #1013529 06/16/11 04:22 PM 06/16/11 04:22 PM
Joined: Jan 2003 Posts: 1,359 Buzzard County, FL IronWolf pro stock
IronWolf pro stock Joined: Jan 2003 Posts: 1,359 Buzzard County, FL	Two points : If you would read the FSM, you could bench test any sending unit ; set leads to your multimeter as advised, and operate the arm. Secondly, the ground strap is a weak point. Build your own ground with alligator clips ; clamp and test. My guess is that you have lousy ground (happened to me !).

Re: Sending Unit - Best Place to Buy and Questions [Re: IronWolf] #1013530 06/16/11 08:05 PM 06/16/11 08:05 PM
Joined: Oct 2009 Posts: 217 Owosso, Michigan S stateroadhog enthusiast
stateroadhog enthusiast S Joined: Oct 2009 Posts: 217 Owosso, Michigan	did it, hooked up good ground with aligator clips no diffrence. Been experimenting all day. okay with no fuel in tank reading is 77.4 ohms gauge rest below empty. with 2.5 gallons reading is 49.7 gauge sets on empty.add 5 gallons reading is 37.4 gauge reads between 1/4 and empty. Its like the readings are changing each time I try it. Has any one tried to bend arm to get an empty reading on gauge with diffrent ohm reading and see what happens?

Re: Sending Unit - Best Place to Buy and Questions [Re: stateroadhog] #1013531 06/16/11 08:38 PM 06/16/11 08:38 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	You've verified a good ground & I was thinking maybe a person could add a resistor in series to up the resistance to reduce voltge to shift the needle back to dead on E when the float is at the bottom of it's travel BUT w it's showing a diff reading each time I'd eyeball the windings & see what's changing/shorting as something is or there is a poor connection somewhere that is changing the ohms but you are physically moving the float/arm between tests so I'd zero in on the windings & check that the arm that slides on the windings has enough tension down on the windings or anything else that dont look kosher. live every 24 hour block of time like it's your last day on earth

Re: Sending Unit - Best Place to Buy and Questions [Re: RapidRobert] #1013532 06/16/11 08:46 PM 06/16/11 08:46 PM
Joined: Nov 2007 Posts: 21,814 Kirkland, Washington Pacnorthcuda Too Many Posts
Pacnorthcuda Too Many Posts Joined: Nov 2007 Posts: 21,814 Kirkland, Washington	You can always make a new voltage limiter for the fuel gauge--adjustable and digital. Pretty easy. I have one on my fuel gauge. In a nut shell it allows you to dial in a voltage anywhere from about 4-6 volts so you can boost or lower your gauge reading. Doesn't solve linearity problems, but allows you to increase or decrease (but not both) the reading at any level.

Re: Sending Unit - Best Place to Buy and Questions [Re: Pacnorthcuda] #1013533 06/16/11 09:40 PM 06/16/11 09:40 PM
Joined: May 2005 Posts: 583 NJ R rth mopar
rth mopar R Joined: May 2005 Posts: 583 NJ	my new one gets similar readings.took it back out and hooked up wires.key on operating by hand reading are good at gauge.put back in same crap.maybe topping out on tank?bend float arm thens hits pickup tube.wish i had orig to compare float swing.

Re: Sending Unit - Best Place to Buy and Questions [Re: rth] #1013534 06/17/11 09:47 AM 06/17/11 09:47 AM
Joined: Oct 2009 Posts: 217 Owosso, Michigan S stateroadhog enthusiast
stateroadhog enthusiast S Joined: Oct 2009 Posts: 217 Owosso, Michigan	wow hear we go borrowed a sending unit from friend. Stock 40 year old unit. diffrences are swing arm on unit 1/2 inch longer after radius.diffrent ohm readings on swing of old compared to new. measuring from center of float to pickup tube. slightly over 10 ohms diffrence in same spots along sweep. both read almost same at each end of sweep. old 80.8 new 77.9 on empty old 9.4 new 10.6. where it really varies is along sweep at 47 ohms on old unit gauge reads 1/8 tank on new at 49 it reads empty.

Re: Sending Unit - Best Place to Buy and Questions [Re: stateroadhog] #1013535 06/17/11 09:55 AM 06/17/11 09:55 AM
Joined: Jan 2003 Posts: 74,942 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,942 U.S.S.A.	Has anyone tried to put the old swing arm assembly on a new pickup ?

Re: Sending Unit - Best Place to Buy and Questions [Re: JohnRR] #1013536 06/17/11 10:06 AM 06/17/11 10:06 AM
Joined: Oct 2009 Posts: 217 Owosso, Michigan S stateroadhog enthusiast
stateroadhog enthusiast S Joined: Oct 2009 Posts: 217 Owosso, Michigan	by the way the old sending unit makes gauge readings more accurate, not perfect but more usefull.not 8 gals left on empty. I also get diffrent readins on gauge when installed in tank as compared to on bench. yes good ground and 5 volts to gauge

Re: Sending Unit - Best Place to Buy and Questions [Re: stateroadhog] #1013537 06/17/11 02:33 PM 06/17/11 02:33 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.	Cut the swing arm assembly off a good factory unit and attach to the tube with screw type hose clamps thru the 2 slots in the swing arm assembly. And connect the wire to the repo strap type wire.

Re: Sending Unit - Best Place to Buy and Questions [Re: Crazy68Dart] #1013538 06/17/11 03:30 PM 06/17/11 03:30 PM
Joined: Jan 2003 Posts: 961 Carson City, Nevada RobbMc super stock
RobbMc super stock Joined: Jan 2003 Posts: 961 Carson City, Nevada	We will be offering our 1/2" sending units for Mopar A-bodies in about a week or so. They are not on our website yet but will be similar to this one: http://www.robbmcperformance.com/products/1084_fordsend.html Will have 1/2" feed and return (AN fittings optional). The 1/2" return is handy if you are using a return/bypass style regulator. Designing a better mouse trap always seems to lead to the evolution of smarter mice. www.robbmcperformance.com

Re: Sending Unit - Best Place to Buy and Questions [Re: RobbMc] #1013539 06/17/11 07:29 PM 06/17/11 07:29 PM
Joined: Jul 2003 Posts: 1,212 Canton, Ohio Crazy68Dart OP pro stock
Crazy68Dart OP pro stock Joined: Jul 2003 Posts: 1,212 Canton, Ohio	Quote: We will be offering our 1/2" sending units for Mopar A-bodies in about a week or so. They are not on our website yet but will be similar to this one: http://www.robbmcperformance.com/products/1084_fordsend.html Will have 1/2" feed and return (AN fittings optional). The 1/2" return is handy if you are using a return/bypass style regulator. Rob, you made my day. I was just on your website a few days ago hoping to find one, but didn't see it. Can you PM with details, or throw it out here if you want for all to see? I am interested in a 1/2" feed with 1/4" return, AN option would be perfect. I am confident that yours will read as it should, but tell me it will, just so I feel better. Thanks! Last edited by Crazy68Dart; 06/17/11 07:30 PM. 383, Hemi 4-Speed, AlterKtion, D60

Re: Sending Unit - Best Place to Buy and Questions [Re: Crazy68Dart] #1013540 06/17/11 07:47 PM 06/17/11 07:47 PM
Joined: Jan 2003 Posts: 961 Carson City, Nevada RobbMc super stock
RobbMc super stock Joined: Jan 2003 Posts: 961 Carson City, Nevada	You can order it with or without AN fittings. You can also order it with a 1/2" to 1/4" reducer fitting for the return line. Cost will be $169 plus $20 for AN fittings. The reducer fitting is $6. We have an A-body gas tank with a hole cut in the side so we can see the position of the float. We've tried to place the float very close to the bottom of the tank when the arm is at the bottom of it's travel and very close to the top when the arm is at the top of it's travel. On our other sending units, we have found that it is common for the gauge to read a little higher or lower than with the stock sending unit (maybe 1/8 tank different) but if you feel it is too far off, you can return it and we will rework the arm. Bending the arm so the float is lower makes the gauge read higher. Bending the arm so the float is higher, makes the gauge read lower. Everyone has a different opinion on how the gauge should read. I run our sending unit in two of my cars. I have them adjusted so the car runs out of gas when the needle on the gauge is right on the "E" mark. I prefer that over having the car run out of gas at some unknown point somewhere below "E". However, most people are accustomed to the idea of having a few gallons left in the tank when you get to "E" so that's how we try to set them up. BTW, most cars sold in Europe have gauges that read "E" when you are actually out of gas but in the USA, gas gauges traditionally are set up so you still have a few gallons in the tank when the gauge reads "E". I wonder why? Designing a better mouse trap always seems to lead to the evolution of smarter mice. www.robbmcperformance.com

Re: Sending Unit - Best Place to Buy and Questions [Re: RobbMc] #1013541 06/17/11 08:48 PM 06/17/11 08:48 PM
Joined: Jul 2003 Posts: 1,212 Canton, Ohio Crazy68Dart OP pro stock
Crazy68Dart OP pro stock Joined: Jul 2003 Posts: 1,212 Canton, Ohio	Your logic makes sense to me. Can I PM you here, e-mail, or? When do you think the sending unit will be available (shipped) if I order in the next few days? FWIW, I am soon to try your starter (I purchased it from you a few years back). That and your cap adapter. Dunno, we drive a lot more automatics in this country too... 383, Hemi 4-Speed, AlterKtion, D60

Re: Sending Unit - Best Place to Buy and Questions [Re: Crazy68Dart] #1013542 06/17/11 08:56 PM 06/17/11 08:56 PM
Joined: Jan 2003 Posts: 961 Carson City, Nevada RobbMc super stock
RobbMc super stock Joined: Jan 2003 Posts: 961 Carson City, Nevada	Dart, Please email me for more info. Email address is shown here: http://www.robbmcperformance.com/contact.html Designing a better mouse trap always seems to lead to the evolution of smarter mice. www.robbmcperformance.com

Re: Sending Unit - Best Place to Buy and Questions [Re: RobbMc] #1013543 06/17/11 11:59 PM 06/17/11 11:59 PM
Joined: Oct 2009 Posts: 217 Owosso, Michigan S stateroadhog enthusiast
stateroadhog enthusiast S Joined: Oct 2009 Posts: 217 Owosso, Michigan	will you be offering 1/2 inch sending unit pickups for 70 b-bodys?

Re: Sending Unit - Best Place to Buy and Questions [Re: stateroadhog] #1013544 06/18/11 12:05 AM 06/18/11 12:05 AM
Joined: Jan 2003 Posts: 961 Carson City, Nevada RobbMc super stock
RobbMc super stock Joined: Jan 2003 Posts: 961 Carson City, Nevada	Only A-bodies for now. We may add other applications later. Designing a better mouse trap always seems to lead to the evolution of smarter mice. www.robbmcperformance.com

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