Fuel sender question.

[Dave Dyer]

Hi All,

Has anybody at any stage of their TR7 rebuild ever tested the fuel sender unit ?
I have my tank out and I'm just about to refit it so checked the sender on ohms, but as I moved the float up I expected an increase in resistance, but it just jumped from 320 ohms to infinity! What should I expect to see ?

Any help would be gratefully received.

Dave

[ngtf]

Hi Dave

The sender should drop down to about 15ohms from memory when sender is in tank full position. It should also be reading something in-between those two figures at about middle of travel. It certainly should not go to infinity!!

Cheers

Gary

Eeyore rides again !!

EOR14W - Persian Aqua 2L Dhc, Now rebuilt and looking lovely - Sprint engine being prepared!

[Dave Dyer]

Thanks for that Gary,

From what you say, it looks like its duff, I might as well change it while I have the access.
For something so important as to show the level of fuel in the tank, it seems such a weak design, in all the cars I've ever owned not one has had an accurate fuel display!!

Cheers,
Dave

[flynns tr 7]

did you have it connected to the right connector. if you look on the tank unit thier should be a T and W the t is the sender connector to the gauge.The W is for the waring light.

[Dave Dyer]

Hi Flynn,

Good point, No I don't think I was measuring at the right connections, I'll look again tomorrow, I'll clean each one up to see which shows the T and W. I think I was measuring between them and from what you say I should be going between each one and earth.

Thanks,
Dave

[Dave Dyer]

I rechecked between T and earth, test meter on ohms, as Gary had said it starts at a low resistance with the float up and gradually increases as the float is lowered.
Test completed- Pass!

Thanks again guys.
Dave