Jump to content


Photo
- - - - -

Sending unit 510 gas tank


  • Please log in to reply
50 replies to this topic

#21 edekalil

edekalil

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 1,702 posts
  • Location:McComb,MS
  • Cars:3-510 2 door sedans, 2 wagons all early 70s

Posted 07 June 2017 - 03:43 PM

Your right there

CEO of the McComb, MS chapter of the 510


#22 edekalil

edekalil

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 1,702 posts
  • Location:McComb,MS
  • Cars:3-510 2 door sedans, 2 wagons all early 70s

Posted 11 June 2017 - 06:48 AM

Well what looked like this

01B0FA8D-A12A-4270-8D56-FCA4DEAA2218.jpg

Now is looking like this

81B6DCD1-31B2-45F4-8761-1109DFAB4F4E.jpg

1149C090-A3AD-44E0-998F-F30176365BBE.jpg

After soaking in apple cider vinegar for about 4-5 days then carful light brushing with a soft tooth brush. It's all freed up and moves freely now so now I hope it all works which it should as long as you do not break the little wire resister.

Thank you YouTube.

CEO of the McComb, MS chapter of the 510


#23 thisismatt

thisismatt

    Senior Damon

  • Senior Member
  • PipPipPipPipPip
  • 7,171 posts
  • Location:Santa Barbara, CA
  • Cars:'71 521, '69 521 donor

Posted 11 June 2017 - 07:35 AM

Unfortunately, without any protective plating, it will likely rust again very quickly :(
I'm your huckleberry.

One jump ahead of the lawmen
That's all, and that's no joke
These guys don't appreciate I'm broke

#24 edekalil

edekalil

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 1,702 posts
  • Location:McComb,MS
  • Cars:3-510 2 door sedans, 2 wagons all early 70s

Posted 11 June 2017 - 08:04 AM

Probably so I thought that too. But if it can work then I'll have to try it. I use nonethenol gas here that may not help it but what the heck. I guess I'll do what Mr Big Tanker would and have it gold plated, that may hold off the corrosion.

CEO of the McComb, MS chapter of the 510


#25 crewy

crewy

    Advanced Member

  • Members
  • PipPipPip
  • 113 posts
  • Location:cencal
  • Cars:several

Posted 11 June 2017 - 08:08 AM

That came out pretty clean. My tank and unit after sitting looks just as clean as thT. The as why I can't figure out why my it doesn't register. I was wondering during if the temp and fuel work together cus I disconnected my temp to put a guage in

#26 LenRobertson

LenRobertson

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 1,284 posts
  • Location:E. Washington
  • Cars:'72 510 4-door, '79 200SX, '77 F10 humpback

Posted 11 June 2017 - 09:06 AM

That came out pretty clean. My tank and unit after sitting looks just as clean as thT. The as why I can't figure out why my it doesn't register. I was wondering during if the temp and fuel work together cus I disconnected my temp to put a guage in

I just went out to my '72 510 and pulled the wire off the temp sender at the thermostat housing. The fuel gauge still works fine. Both fuel and temp gauges are powered through the same gauge voltage regulator but each gauge then has its own ground wire out to its sender. The sender is actually a variable ground.

 

The way to test your fuel gauge is unhook the wire from the sender at the tank. Use a jumper wire to hook the sender wire to ground. If the gauge is working properly it will read Full. Sparks won't fly when touching the sender wire to ground because it is actually a ground wire. If it reads Full when grounded but the gauge doesn't work when hooked to the sender, likely your sender is bad.

 

Len



#27 edekalil

edekalil

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 1,702 posts
  • Location:McComb,MS
  • Cars:3-510 2 door sedans, 2 wagons all early 70s

Posted 12 June 2017 - 08:07 AM

Sending unit seems to be fully functional.

FB917EF4-0F1B-4B39-BB8E-AC5F56FF002F.jpg

151A9D68-67D3-427C-AF71-E2F444735A1D.jpg

FAF2428B-3CA9-43E8-8B33-5D07C245464B.jpg

7895FACE-0D9B-470C-B0E9-981F6F11BB60.jpg

057221B0-F07A-47C7-ACA4-118568E3E61D.jpg

F38CB011-4595-4F0F-9B45-EFC0A39F8745.jpg

So I guess I'll clean the rest and see how it all goes.

CEO of the McComb, MS chapter of the 510


#28 crewy

crewy

    Advanced Member

  • Members
  • PipPipPip
  • 113 posts
  • Location:cencal
  • Cars:several

Posted 14 June 2017 - 07:20 AM

OK Len I tried doing that and it still didn't work. That means the unit in the tank maybe bad from what your saying. Would changing the Alternator to a internal instead of a external change the difference of the gauges. There shouldn't be any difference between the 68 then the 70s guages



#29 datzenmike

datzenmike

    KING RAT

  • User Administrator
  • 68,138 posts
  • Location:Vancouver Island
  • Cars:'74 710 sedan, '76 710. prevoius... '78 620, '71 521, '68 510 new '76 B-210

Posted 14 June 2017 - 12:45 PM

Are there two wires to the tank? The other may be a ground and if that is broken there is no ground connection. If just a single wire it is grounded through the tank... try running a good ground to the tank and see if that works.

 

If not than the sender is broken or stuck.


Posted Image

#30 edekalil

edekalil

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 1,702 posts
  • Location:McComb,MS
  • Cars:3-510 2 door sedans, 2 wagons all early 70s

Posted 15 June 2017 - 04:55 AM

Now to do the same to the other sedan sending units and see how it go's.

CEO of the McComb, MS chapter of the 510


#31 LenRobertson

LenRobertson

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 1,284 posts
  • Location:E. Washington
  • Cars:'72 510 4-door, '79 200SX, '77 F10 humpback

Posted 15 June 2017 - 07:22 AM

OK Len I tried doing that and it still didn't work. That means the unit in the tank maybe bad from what your saying. Would changing the Alternator to a internal instead of a external change the difference of the gauges. There shouldn't be any difference between the 68 then the 70s guages

You are saying you pulled to wire off the tank sender and connected the wire to ground and the fuel gauge didn't move? I want to be sure I'm clear on what you did (and morning coffee hasn't kicked in yet so I'm struggling with getting my brain to function!). Be certain you have a really good bare metal ground when you do this.

 

I just went out to my 510 and tried another test - with the key in ON position my fuel gauge works. I went back and pulled the wire off the sender at the tank. Then I put a test light between the sender wire and ground. The test light lights up (although unexpectedly it blinks off and on. datzenmike - remember we were talking the other day on how often the gauge voltage regulator points make/break contact? Maybe there is another explanation for the blinking test light but the regulator is the only thing I can think of).

 

So if your gauge doesn't move when the sender wire is grounded and you don't get a light when hooking a test light from the sender wire to ground, you must have a problem elsewhere in the gauge circuit.

 

When you turn your key to ON position, do the oil pressure and alt lights light up (although if you have aftermarket gauges the lights may be unhooked)? If they light up this is an indication of power to the dash circuit.

 

I don't see any reason going to an internally regulated alternator would bother the gauges any. They should still be getting the same voltage. I have a 280Z int. reg. alt on my 510 and the gauges work.

 

Len



#32 edekalil

edekalil

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 1,702 posts
  • Location:McComb,MS
  • Cars:3-510 2 door sedans, 2 wagons all early 70s

Posted 16 June 2017 - 05:49 AM

I think I will spray or coat this sending unit with some Tuf Glide not sure if it would help stop any rerusting of it but it should not hurt it. Now the question is do I use the old O ring that looks flat or get a new one. Any ideas what and where to get it?

CEO of the McComb, MS chapter of the 510


#33 Crashtd420

Crashtd420

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 1,289 posts
  • Location:Massachusetts
  • Cars:1972 Datsun 521

Posted 16 June 2017 - 06:41 AM

I bought these off ebay..... 1/8 thick... seems to fit good... and was rated for gas.
Screenshot_20170616-103744_zpsfgvd7scg.p
I've seen some for zcars online too and some have said take it to Napa and match it up... but napa near me sucks so I don't bother....

#34 crewy

crewy

    Advanced Member

  • Members
  • PipPipPip
  • 113 posts
  • Location:cencal
  • Cars:several

Posted 16 June 2017 - 08:21 AM

Hey Len

Ill try with the key on this time lol. All if my other lights light up when I turn on ignition. So Ill try with the key on. If it registers with it on the sending unit in the tank is bad. 



#35 edekalil

edekalil

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 1,702 posts
  • Location:McComb,MS
  • Cars:3-510 2 door sedans, 2 wagons all early 70s

Posted 16 June 2017 - 09:38 AM

I bought these off ebay..... 1/8 thick... seems to fit good... and was rated for gas.
Screenshot_20170616-103744_zpsfgvd7scg.p
I've seen some for zcars online too and some have said take it to Napa and match it up... but napa near me sucks so I don't bother....

Thank you just got the same deal.

CEO of the McComb, MS chapter of the 510


#36 Crashtd420

Crashtd420

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 1,289 posts
  • Location:Massachusetts
  • Cars:1972 Datsun 521

Posted 16 June 2017 - 10:04 AM

No problem.... I enjoy helping and sharing what I find and learn....
That seller was really quick too ...
Nice work on your sending unit....

#37 edekalil

edekalil

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 1,702 posts
  • Location:McComb,MS
  • Cars:3-510 2 door sedans, 2 wagons all early 70s

Posted 16 June 2017 - 10:50 AM

No problem.... I enjoy helping and sharing what I find and learn....
That seller was really quick too ...
Nice work on your sending unit....


Why Thank You.

CEO of the McComb, MS chapter of the 510


#38 LenRobertson

LenRobertson

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 1,284 posts
  • Location:E. Washington
  • Cars:'72 510 4-door, '79 200SX, '77 F10 humpback

Posted 16 June 2017 - 01:13 PM

Hey Len

Ill try with the key on this time lol. All if my other lights light up when I turn on ignition. So Ill try with the key on. If it registers with it on the sending unit in the tank is bad. 

Yeah, key on is much better! The problem with a test to ground like this is knowing whether or not the ground is really good. I plan to take a long piece of 14 gauge wire with an alligator clip on each end and make a test lead I can run outside the car to the battery neg terminal. Then I can feel more confident I really have something reliable to ground to rather than scratching around inside the trunk or under the dash trying to get a ground.

 

If you have a test light, try testing between the sender wire (pulled off the sender) and ground. I'm curious if you (or anyone else who wants to try this) will get a blinking test light. I'm still not sure what is causing the blinking.

 

It is worth running a jumper wire from the body of the sender to ground as datzenmike suggested. A lot of problems end up being bad or dirty grounds.

 

The inside of my 510 tank and the entire sender were coated with brown varnish due to gas drying out in the tank. I used spray carb cleaner and Q-tips to clean the resistance coils on the sender and the wiper on the float arm. There is probably a continuity test that can be done on the coils but I haven't had one of the senders out in years and can't quite picture in my mind how to test this.

 

Len



#39 Tedman

Tedman

    Member

  • Members
  • PipPipPip
  • 146 posts
  • Location:Harbor City, CA
  • Cars:'72 Datsun 510 (x2), '05 Xterra (VQ40DE Donor?), '62 Porsche 356 Coupe (project)

Posted 17 June 2017 - 10:07 PM

FWIW, New Datsun Parts has a new 510 sedan or Wagon sender for $99 if you just want to be done with it.

http://www.new-datsun-parts.com


-Tedman

"Bolt it up and let it happen" -Anon

#40 edekalil

edekalil

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 1,702 posts
  • Location:McComb,MS
  • Cars:3-510 2 door sedans, 2 wagons all early 70s

Posted 18 June 2017 - 04:50 AM

Thanks for that info. I'll get mine out today, I let the other side clean up so It should be all clean now. I still have to deal with 3 sedan senders. So for now I'll hold off in case someone who really needs a working one they can use that info. It is very tempting I almost jumped on it. I will probably put some tuf glide on it, it may not help but I'll give it a shot, my guns haven't rusted since I put it on them. So for now I'll just let her bump. I'm way further alone than I was for now and it works.

CEO of the McComb, MS chapter of the 510