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Replacing sending unit in-cab tank #2914388
04/24/21 04:14 PM
04/24/21 04:14 PM
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Central Florida
larrymopar360 Offline OP
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'79 W150 with in cab tank (yes I promise factory unit on a 1979). My unit is leaking from the top fuel feed nozzle. I THINK it's a pretty straight forward job. Disconnect battery, disconnect wire to sending unit, tap lock ring counter clockwise to loosen, pull out sending unit, put on new rubber gasket, feed in new unit, lock ring by turning clockwise, reconnect wire then battery. Is it this simple? New unit already has sock on it. I'll index it the same as the old one. Thanks. Never installed new one before but with it right at top of tank, seems like it should be a no-brainer, which is perfect for me laugh

s-l1600.jpg
Last edited by larrymopar360; 04/24/21 04:16 PM.

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Re: Replacing sending unit in-cab tank [Re: larrymopar360] #2914391
04/24/21 04:20 PM
04/24/21 04:20 PM
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larrymopar360 Offline OP
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I circled where mine was leaking

s-l1600.jpg

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Re: Replacing sending unit in-cab tank [Re: larrymopar360] #2914405
04/24/21 04:39 PM
04/24/21 04:39 PM
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Easy job and no need to disconnect the battery. The sending unit wire is a ground.

Re: Replacing sending unit in-cab tank [Re: stumpy] #2914426
04/24/21 06:02 PM
04/24/21 06:02 PM
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Originally Posted by stumpy
Easy job and no need to disconnect the battery. The sending unit wire is a ground.
Thank you!


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Re: Replacing sending unit in-cab tank [Re: larrymopar360] #2914525
04/24/21 10:13 PM
04/24/21 10:13 PM
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Just make sure the "O" ring is in the proper location before you tighten the lock ring or you could cut the "O" ring.

Re: Replacing sending unit in-cab tank [Re: poorboy] #2914532
04/24/21 10:51 PM
04/24/21 10:51 PM
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It is safer if you use a brass or plastic tool to tap on the ring with. Don't want to create any sparks if you can help it.

Re: Replacing sending unit in-cab tank [Re: stumpy] #2914702
04/25/21 11:24 AM
04/25/21 11:24 AM
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larrymopar360 Offline OP
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Originally Posted by stumpy
It is safer if you use a brass or plastic tool to tap on the ring with. Don't want to create any sparks if you can help it.
That makes sense stumpy, good tip. Thank you very much.


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Re: Replacing sending unit in-cab tank [Re: poorboy] #2914703
04/25/21 11:25 AM
04/25/21 11:25 AM
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larrymopar360 Offline OP
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Originally Posted by poorboy
Just make sure the "O" ring is in the proper location before you tighten the lock ring or you could cut the "O" ring.
Got it, thank you. I was wondering if it'll try and turn with the lock ring and bind up. As I said, first one I've done because most aren't so easy to get to. Hopefully Thursday when I'm off work.


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Re: Replacing sending unit in-cab tank [Re: larrymopar360] #2914951
04/25/21 09:43 PM
04/25/21 09:43 PM
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They have tabs that locate them in the tank.


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: Replacing sending unit in-cab tank [Re: Guitar Jones] #2915031
04/26/21 08:20 AM
04/26/21 08:20 AM
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Originally Posted by Guitar Jones
They have tabs that locate them in the tank.
Oh good thank you.


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Re: Replacing sending unit in-cab tank [Re: larrymopar360] #2915126
04/26/21 11:41 AM
04/26/21 11:41 AM
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Did you think about putting some JB weld around that line where it leaks? Usually the original senders are better then the afternarket ones are.

I didn't know or think about still having in cab tanks in 79.

Re: Replacing sending unit in-cab tank [Re: 5thAve] #2915207
04/26/21 01:45 PM
04/26/21 01:45 PM
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larrymopar360 Offline OP
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Originally Posted by 5thAve
Did you think about putting some JB weld around that line where it leaks? Usually the original senders are better then the afternarket ones are.

I didn't know or think about still having in cab tanks in 79.
I did consider JB weld or similar just to keep it on road until I replace, but it might be a permanent solution shruggy. I also looked for a NOS one on ebay, but none right now. I too am leery of aftermarket ones, but this particular seller has sold 100's with 100% feedback, so I decided to take a chance, and he has a 30 day return policy. Hope I don't regret it.


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Re: Replacing sending unit in-cab tank [Re: larrymopar360] #2915231
04/26/21 02:21 PM
04/26/21 02:21 PM
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If it were mine I'd clean it up and silver solder that area.


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'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: Replacing sending unit in-cab tank [Re: Guitar Jones] #2915239
04/26/21 02:29 PM
04/26/21 02:29 PM
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larrymopar360 Offline OP
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Originally Posted by Guitar Jones
If it were mine I'd clean it up and silver solder that area.
I can't solder worth a darn lol. I know it's not rocket science but no experience, and last time I tried I just rolled the bead around everywhere but where I wanted it. I'll keep the old sending unit in case new one has to be sent back.


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Re: Replacing sending unit in-cab tank [Re: 5thAve] #2915245
04/26/21 02:34 PM
04/26/21 02:34 PM
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larrymopar360 Offline OP
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Originally Posted by 5thAve
Did you think about putting some JB weld around that line where it leaks? Usually the original senders are better then the afternarket ones are.

I didn't know or think about still having in cab tanks in 79.
With dual tanks


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Re: Replacing sending unit in-cab tank [Re: larrymopar360] #2916154
04/28/21 02:42 PM
04/28/21 02:42 PM
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Just my own opinion, but I like the new sending units. The new ones are made from stainless steel (usually) so they do not have the rust pinhole issues the original ones do from condensation in the tank.

And soldering or using JB Weld to fix the leak he has, might just be a bandaid for an undetected internal rust issue along the section of pickup tube still in the tank.

I have pulled some that had either lost a good 6" or so of tube into the tank, or had so many pinholes that they wouldn't pickup fuel anymore. Probably from being parked for long periods of time and allowing the condensation to remain at a set level and do its work.


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Re: Replacing sending unit in-cab tank [Re: hp383] #2916173
04/28/21 03:42 PM
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Originally Posted by hp383
Just my own opinion, but I like the new sending units. The new ones are made from stainless steel (usually) so they do not have the rust pinhole issues the original ones do from condensation in the tank.

And soldering or using JB Weld to fix the leak he has, might just be a bandaid for an undetected internal rust issue along the section of pickup tube still in the tank.

I have pulled some that had either lost a good 6" or so of tube into the tank, or had so many pinholes that they wouldn't pickup fuel anymore. Probably from being parked for long periods of time and allowing the condensation to remain at a set level and do its work.
Thanks. New one is definitely stainless. I'll get new sock filter this way also, and as I wrote before seller has sold a ton of these and 100% feedback


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Re: Replacing sending unit in-cab tank [Re: larrymopar360] #2916363
04/29/21 12:17 AM
04/29/21 12:17 AM
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I've always found the senders rust from the outside and usually leaks from around the lines is from the solder or other problems.

I guess the other plus of new is you know there will be no problems with the float and with the luck I have I'd skip the new sender and then it's not available anymore when I need it. I've read a ton of problems over the years with aftermarket senders not reading properly or being erratic etc.

Re: Replacing sending unit in-cab tank [Re: 5thAve] #2916529
04/29/21 01:05 PM
04/29/21 01:05 PM
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I did have problems with spectra aftermarket senders. And I have also read about problems with them from other people using them. I am keeping my fingers crossed on this one...not a spectra and lots of good feedback. At least it’s very easy to get to with no dropping the tank and I will send it right back for refund if bad and go plan B. which probably will be finding NOS


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Re: Replacing sending unit in-cab tank [Re: larrymopar360] #2916582
04/29/21 03:11 PM
04/29/21 03:11 PM
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vansauto.com sells sending units for a wide variety of the truck applications and any I have used has the correct ohm rating to show the correct level.


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Re: Replacing sending unit in-cab tank [Re: hp383] #2916598
04/29/21 03:48 PM
04/29/21 03:48 PM
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Larry this is a 15 minute job just do it.

Re: Replacing sending unit in-cab tank [Re: stumpy] #2916870
04/30/21 09:45 AM
04/30/21 09:45 AM
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Originally Posted by stumpy
Larry this is a 15 minute job just do it.
I understand the sentiment but I’m still waiting on part anyway. Should be here today or tomorrow.

New one I bought says all are tested for proper ohms for accuracy and quality.

Looking again at my current one I believe someone installed lock ring upside down?

7A3F39BD-2CD4-41E2-B973-0618AAA1D8DF.jpeg
Last edited by larrymopar360; 04/30/21 05:58 PM. Reason: Rotate pic

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Re: Replacing sending unit in-cab tank [Re: larrymopar360] #2916876
04/30/21 09:55 AM
04/30/21 09:55 AM
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It is on right but not tight.

Re: Replacing sending unit in-cab tank [Re: NITROUSN] #2916877
04/30/21 09:57 AM
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Thanks

You sure? I just removed it. Ring was bent down at lip as if to make it fit under locking lip on tank

30B5B92F-642C-42A4-A6F6-FCE771203627.jpeg
Last edited by larrymopar360; 04/30/21 05:57 PM. Reason: Rotate pic

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Re: Replacing sending unit in-cab tank [Re: larrymopar360] #2916952
04/30/21 12:14 PM
04/30/21 12:14 PM
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You are correct, it was on Upside down


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Re: Replacing sending unit in-cab tank [Re: W.I.N. Racing] #2916979
04/30/21 01:19 PM
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Originally Posted by W.I.N. racing
You are correct, it was on Upside down


Yup my bad. I Thought by the picture it looked to be ok. You would think it would be a no brainer on which way it goes. First time for everything.

Re: Replacing sending unit in-cab tank [Re: NITROUSN] #2917003
04/30/21 02:10 PM
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The guy that had the truck before me left a lot of things half-azzed. Thanks for assist.


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Re: Replacing sending unit in-cab tank [Re: larrymopar360] #2918912
05/05/21 03:28 PM
05/05/21 03:28 PM
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I installed sender and lock ring (proper way this time) and now I realize wire was supposed to have a push on connector like one in this picture but it's long gone. I'd like to find another but no luck local parts store or Feebay. I've googled "push on connectors" and so far I don't find. Any specialties stores online anyone knows of? Driving around town looking doesn't sound fun. Stud is M5 - .08. Thanks.

s-l1600.jpg

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Re: Replacing sending unit in-cab tank [Re: larrymopar360] #2918921
05/05/21 03:43 PM
05/05/21 03:43 PM
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go to a napa and find the electrical connector guru or book. some ford temp/oil sending units are the same style but not overshielded like that one. i have used them before with great success.

Re: Replacing sending unit in-cab tank [Re: trw1982] #2918947
05/05/21 04:46 PM
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I have used butt connecters to replace push on terminals.

Re: Replacing sending unit in-cab tank [Re: stumpy] #2918954
05/05/21 05:01 PM
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Thanks for the suggestion guys. I wondered about the oil sending unit connectors but none of them list a size. I used to have a bunch of the stuff and I just recently decided to make some more room in the garage and of course now I need one LOL. I tried a connector and nut but the nut does not tighten down tight. I’m going to try o/p sender next 👍


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Re: Replacing sending unit in-cab tank [Re: larrymopar360] #2918957
05/05/21 05:02 PM
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Re: Replacing sending unit in-cab tank [Re: stumpy] #2918963
05/05/21 05:11 PM
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Originally Posted by stumpy
Pricy but it would work.
https://www.ebay.com/itm/192938234195?
I wouldn’t mind spending this and if the oil sending unit ones aren’t the right size I’ll give this a try. I’m ready to be done with this and move on to other things. I didn’t plan on this being a project. Thanks again.


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Re: Replacing sending unit in-cab tank [Re: larrymopar360] #2919031
05/05/21 08:05 PM
05/05/21 08:05 PM
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the one from napa will be a tad smaller but have threads inside it to hold it on tight so it wont lose connection. i have done this before .works great.

Re: Replacing sending unit in-cab tank [Re: larrymopar360] #2919043
05/05/21 08:16 PM
05/05/21 08:16 PM
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One from the older single wire engine coolant sensors should also work.

Re: Replacing sending unit in-cab tank [Re: NITROUSN] #2919152
05/06/21 12:45 AM
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I've also used a but conncetor on those things before and squished them with pliers a bit if they were too loose.

Re: Replacing sending unit in-cab tank [Re: 5thAve] #2919404
05/06/21 04:20 PM
05/06/21 04:20 PM
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Found one on Feebay with help of seller of sending unit. It's listed for A-B-C body cars as repair wire but will fit my truck sender. Woo hoo. I tried all kinds of searches but none included A-B-C body so it didn't come up. $15 and on the way.

s-l1600 (1).jpg

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Re: Replacing sending unit in-cab tank [Re: larrymopar360] #2922530
05/14/21 04:36 PM
05/14/21 04:36 PM
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The plug from vansauto feels very high quality, factory style and fits very snug AND as you can see came with lengthy wire. So glad I was directed there. If yours needs replacing I highly recommend this one and it was under $20. up No more gas smell even when the tank is full and I’m getting accurate readings.

D2374E92-47C4-4044-9E68-B59696B36067.jpeg
Last edited by larrymopar360; 05/15/21 12:51 PM.

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Re: Replacing sending unit in-cab tank [Re: larrymopar360] #2922642
05/14/21 10:54 PM
05/14/21 10:54 PM
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Good deal. up

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