Fuel Sender wiring question

[NJ94Chim]

I was finally able to seal the fuel that was leaking out from around the fuel sender.

But in the process I managed to completely remove one of the three connector spade lugs that come up out of the top of the fuel sender unit. These are the three male spade lugs that the wiring harness attaches to. The one that came out goes to a blue wire. The other three connections remain tight.

All the wiring diagrams I've seen indicate that there should only be two connections to the sender....but mine has four: blue wire (leftmost), black (center), green (rightmost), plus a fatter black wire that fits down over one of the attachment bolts. See photo.

Does anyone know what these four connections are for?

And whether the blue one matters? Maybe its for the low fuel lamp?

BTW, I tried to jam the spade lug back into the body of the sender unit....not sure (at all) whether it is electrically connecting to anything.


Thanks

[phillpot]

Any help here?

https://www.pistonheads.com/gassing/topic.asp?h=0&...

[pmc_3]

Mine has the blue and the green/black on the opposite sides to yours but I've seen photos of others where they are connected the same as yours.

Edited by pmc_3 on Friday 11th October 12:33

[Jordie Barretts sock]

Pmc, yours isn't the opposite sides, the sender is 180° to the OP.

Green is to the gauge. Black is earth and blue is switched live isn't it?

[pmc_3]

Jordie Barretts sock said:

Pmc, yours isn't the opposite sides, the sender is 180° to the OP.

Green is to the gauge. Black is earth and blue is switched live isn't it?

I thought that initially, then I looked at the bolt hole locations

[NJ94Chim]

Philpot, great link, very helpful, thanks.

So it looks like there's a +12V (switched) feed that goes to the sender unit.

But the fuel sensing part of the sender is basically just a variable resistor, which would only have two connections. One of these would be to the wiper (variable part), the other to the other end of the resitor swath.

What aspect of the fuel sender is the +12V needed for?

[Jordie Barretts sock]

pmc_3 said:

Jordie Barretts sock said:

Pmc, yours isn't the opposite sides, the sender is 180° to the OP.

Green is to the gauge. Black is earth and blue is switched live isn't it?

I thought that initially, then I looked at the bolt hole locations

True, the five holes are not equidistant.