Topic: Fuel Tank Sending unit

[mikeljgt500kr]

I am about to replace the incorrect, two prong sending unit in my '67 GT, which has the optional low fuel light on the side of the console, with the correct three prong unit with the low fuel thermistor.  I have the brass float, but it is not attached to the hoop on the unit, which way does the long end of the float go?  Also, it looks pretty tight up against the cross hung muffler but I am assuming it can be aligned to get into the tank without removing the muffler?  Thanks for any help.

[67gtasanjose]

Don't overthink it Mike, just look at any new sender or look at your old one. As far as the muffler clearance...I never tried doing it on a transvese before. Look in this thread of exhaust system pics, there is a picture that seems to suggest it to NOT be an issue:

http://www.concoursmustang.com/forum/index.php?topic=9102.msg53748#msg53748

btw, your other sender should be 1 post

[mikeljgt500kr]

Thanks, just like to plan things out before I start, especially when gasoline is involved…….

And yes, it is only one post, I didn't look closely enough and assumed two like some of my other cars.

[mikeljgt500kr]

Thanks for the help, the restored original sending unit is now in and working like new, even the "Fuel" light on the console works.

[67gtasanjose]

Thanks for the help, the restored original sending unit is now in and working like new, even the "Fuel" light on the console works.

"Restored Original", what did you do or have done to it if I may ask.

Richard

[mikeljgt500kr]

It was an original, three prong unit with the thermistor for low fuel warning that was restored at a Cougar parts place.  They put in a new thermistor, new wiring and soldering and cleaned up all the contacts, with a new arm and refurbished brass float.

[67gta289]

I ended up fixing two original sending units that had resistance ranges out of specification.  I have attached a document with pictures which goes into a little detail behind Mike's previous post comments (from  2015) about cleaning up all the contacts.  This should help if you want to go down the path of restoring an original.

[1967 eight barrel]

Desert classic cars, Bill Bassore restores them, sets the resistance to the original values, replaces the thermistor and cleans them.  He did my sender and repaired my low fuel relay. The ACP reproduction sender is set up like the T-Bird. Which functions different than the Mustang/ Cougar units. Don't purchase a reproduction.

[Bossbill]

Attached is a pic of my cleaned up fuel sending unit.
Behind it is the retainer ring which indicated about what this thing looked like.
However, the interior was actually worse as it looked a bit like barnacles had attached themselves.
I didn't take a 'before' since I was sure this thing was toast, so I experimented.

I initially just used fine glass ball beads at low pressure (30 psi) and found the barnacles just came off.
So I bent back the tabs and opened up the rheostat area. I lowered the pressure even more (20 psi) and very carefully blasted the wires and spring contact.

It cleaned up well and so far registers correctly. The exterior finish is a bit dull so I leave it to others to comment about sheen.

[Bob Gaines]

Attached is a pic of my cleaned up fuel sending unit.
Behind it is the retainer ring which indicated about what this thing looked like.
However, the interior was actually worse as it looked a bit like barnacles had attached themselves.
I didn't take a 'before' since I was sure this thing was toast, so I experimented.

I initially just used fine glass ball beads at low pressure (30 psi) and found the barnacles just came off.
So I bent back the tabs and opened up the rheostat area. I lowered the pressure even more (20 psi) and very carefully blasted the wires and spring contact.

It cleaned up well and so far registers correctly. The exterior finish is a bit dull so I leave it to others to comment about sheen.

The original finish on NOS ones that I have had were not far off that look . I typically plate them for corrosion protection. You can achieve a similar look by adjusting times ,conditions etc while plating . I would finish the reconditioning of your sender by trimming some of the black insulator material coming away from the base that I see in the picture for a better look. That post insulator material tends to flake off with exposure to the elements over time.

[Bossbill]

Thanks for your insight, Bob.

You will see something here not seen when installed. The A7 date stamp at 12:00.
Matches my car well.

There is also an 'H' in the outer clamping ring, discussed in another post. Edit -- add link
http://www.concoursmustang.com/forum/index.php?topic=22101.msg138888#msg138888