Sending Unit Gas Tank

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   Got to reading your post yesterday and worked on my 82SN last night.  Wasn't working properly.  Easy to remove, 5 - 1/4 screws and remove from tank.  Inspected and found as DavidF mentioned varnish on connections inside unit.  I checked it with a volt/ohm meter and wasn't getting a reading when moving float.  I sanded varnish off all conduction points, i.e. the spring and where the body grounds, used some brake cleaner and generally cleaned everything up good.  I also stretched the spring on the float slightly because it didn't look like it was making good contact.  reinstalled and it seems to work just fine.  After I fill up with gas next time I will know if it is indicating right or not.  If not can you adjust the reading on the back of the gauge or somewhere else?

It was a neat little evening project.  When i had it apart I showed my 12 yr. old son how it worked using the volt/ohm meter.  Don't think I impressed him much but hey he's 12 right?!

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tcarden Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: February-21-2006 Location: United States Status: Offline Points: 54	Post Options Post Reply Quote tcarden Report Post Thanks(0) Quote Reply Topic: Sending Unit Gas Tank Posted: May-03-2006 at 10:00am
	Got to reading your post yesterday and worked on my 82SN last night. Wasn't working properly. Easy to remove, 5 - 1/4 screws and remove from tank. Inspected and found as DavidF mentioned varnish on connections inside unit. I checked it with a volt/ohm meter and wasn't getting a reading when moving float. I sanded varnish off all conduction points, i.e. the spring and where the body grounds, used some brake cleaner and generally cleaned everything up good. I also stretched the spring on the float slightly because it didn't look like it was making good contact. reinstalled and it seems to work just fine. After I fill up with gas next time I will know if it is indicating right or not. If not can you adjust the reading on the back of the gauge or somewhere else? It was a neat little evening project. When i had it apart I showed my 12 yr. old son how it worked using the volt/ohm meter. Don't think I impressed him much but hey he's 12 right?!
	"Boat - A hole in the water surrounded by wood (and fiberglass) into which one pours money"

tjackle Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: September-30-2005 Location: United States Status: Offline Points: 60	Post Options Post Reply Quote tjackle Report Post Thanks(0) Quote Reply Posted: May-02-2006 at 9:21am
	I replaced my sending unit for about $20. Local boat store had it. Works great now. If you have to remove the gas tank (like I did) $20 is cheap enough just to replace it.
	78 Nautique If you're going to do it... Do it in a boat

David F Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: June-11-2004 Location: United States Status: Offline Points: 1770	Post Options Post Reply Quote David F Report Post Thanks(0) Quote Reply Posted: May-02-2006 at 9:20am
	I gave this a bit more thought... 1. check the output of the sending unit with a multimeter (set to read resistance, ohms). 2. check the wiring connection at the guage. Sending units work on resistance. i.e. high resistance = empty indication and low resistance = full indication (or vise versa). A poor connection could be falsly providing a high resistance. But, I still think the sending unit is either varnished up or faulty.

1998Nautique Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: January-26-2006 Location: Canada Status: Offline Points: 190	Post Options Post Reply Quote 1998Nautique Report Post Thanks(0) Quote Reply Posted: May-02-2006 at 9:07am
	I'll try it. Thank x a lot for your help. My first year with the biat so there we'll be lots of questions.

David F Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: June-11-2004 Location: United States Status: Offline Points: 1770	Post Options Post Reply Quote David F Report Post Thanks(0) Quote Reply Posted: May-02-2006 at 9:04am
	Yes, definately. But, try cleaning up the one you have before you replace it.

1998Nautique Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: January-26-2006 Location: Canada Status: Offline Points: 190	Post Options Post Reply Quote 1998Nautique Report Post Thanks(0) Quote Reply Posted: May-01-2006 at 11:09pm
	So chances are good it is my sending unit. The dial is way below the E and twitches a bit when I move the float?

Atmspltr Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: May-04-2005 Location: United States Status: Offline Points: 170	Post Options Post Reply Quote Atmspltr Report Post Thanks(0) Quote Reply Posted: May-01-2006 at 11:43am
	By the way, I have an original mechanical fuel gauge with indicator on the top (the one you look down thru the topside to view) from a 67 Mustang in someone needs one. It's in great shape and still works. Didn't know if you wanted to keep it original. RB
	67 Mustang Resto-Mod

David F Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: June-11-2004 Location: United States Status: Offline Points: 1770	Post Options Post Reply Quote David F Report Post Thanks(0) Quote Reply Posted: May-01-2006 at 11:34am
	Sometimes, a bit of carb cleaner or brake cleaner sprayed liberally on the sending unit will remove the varnish and let the sending unit work again.

1998Nautique Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: January-26-2006 Location: Canada Status: Offline Points: 190	Post Options Post Reply Quote 1998Nautique Report Post Thanks(0) Quote Reply Posted: May-01-2006 at 9:30am
	Sure let me know.

JoeinNY Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5698	Post Options Post Reply Quote JoeinNY Report Post Thanks(0) Quote Reply Posted: May-01-2006 at 8:23am
	If its got two wires you dont have to worry about it being grounded, a new sending unit should come with the float. I am hoping my new one arrives today from skidim, if your interested I will let you know what I think of it when it comes in. I don't have an old one to compare it to though since my boat originally came with a mechanical gauge a peep hole on the back deck to look down on it. -Joe.
	1983 Ski Nautique 2001 1967 Mustang 302 "Decoy" Holeshot Video

1998Nautique Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: January-26-2006 Location: Canada Status: Offline Points: 190	Post Options Post Reply Quote 1998Nautique Report Post Thanks(0) Quote Reply Posted: April-30-2006 at 11:37pm
	I had both wires hooked up to the sending unit when I was moving the float. Is that the proper way?

JoeinNY Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5698	Post Options Post Reply Quote JoeinNY Report Post Thanks(0) Quote Reply Posted: April-30-2006 at 6:17pm
	this is probably a stupid question but did you have the sending unit grounded while you were moving the float up and down
	1983 Ski Nautique 2001 1967 Mustang 302 "Decoy" Holeshot Video

Atmspltr Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: May-04-2005 Location: United States Status: Offline Points: 170	Post Options Post Reply Quote Atmspltr Report Post Thanks(0) Quote Reply Posted: April-30-2006 at 3:50pm
	West Marine or Boater's World...it does not need to be a Correct Craft item. It comes with everything you'll need. Take the old one for sizing.
	67 Mustang Resto-Mod

1998Nautique Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: January-26-2006 Location: Canada Status: Offline Points: 190	Post Options Post Reply Quote 1998Nautique Report Post Thanks(0) Quote Reply Posted: April-30-2006 at 2:29pm
	I pulled my sending unit out, and moved the float up and down. And the gas guage stayed well below the E and moved around a bit as I moved the float. I take it I will need a new sending unit. Does the unit come with the float and everything?

Sending Unit Gas Tank

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