Today I purchased a new fuel sender for my S3 tanks installed in my S1.

The older sender was a very used one from a Sovereign that was scrapped and it never showed a full tank - only 1/2 tank. There is about 1/2 tank on that side right now per the odometer...

Today I purchased a new LH fuel sender but it will install two ways due to the notches in the tank and the two lugs on the sender.

Is it supposed to be with the ground lug on the left hand side or right hand side? It reads the correct ohms out of the car for empty and fuel but installed I get nothing on gauge that was working with the old sender??? HELP???

 

Round plastic covered wire goes on the bottom left side.. then the sender fits properly.


It is so much different orientation from the old S1 tanks fuel sender and its location and wiring hookup.

 

Mine is doing the same. It's problem I think is the float is hitting the side of tank and not floating. Am getting my old sender back to check shape of wire

 

Just as another bit of info... The RH one in my series 3 has the ground spade on the left hand side, on the boot side. Just in case that was useful haha

 

Hi All,
I'm new to the forum (and Daimler coupe ownership for that matter) but have already learnt much from reading some of the threads. So I'm hoping someone can help me with this.....I've checked that the actual fuel gauge itself works but on the LH fuel tank I only get a reading just off empty with a full tank of fuel. The resistance across the sender is approx. 220 ohms when full. It's been installed as shown in the attached photo (viewed from the wheel arch) and as you can see it's almost new. I've checked and between terminals is open circuit except between the middle and top terminal (220 ohms).
I'm guessing maybe the sender has been installed in the wrong orientation? Could someone please confirm my suspicion before I go to the extent of draining?
Many thanks in advance

 

"Round plastic covered wire goes on the bottom left side.. then the sender fits properly."

You do not say what year your Jag is, but must be S1 for the wheel well opening for the sender? My post was about S3 tanks in a S1 as replacements. The parts book show the S1 tank sender being on the upper RH side?

Your picture is poor (but the outer locking is not on yet?), but the actual rod in the sender may be allowing the float to hit the sides of the tank causing bad readings. I ended up putting a string on the float end and being able to pull it up and let it down from the filler neck.. finally found the correct position for a proper reading.. very accurate at empty is the best choice!

 

Hi Roger,
Many thanks for the reply. My car is a 1974 Daimler coupe. I shall certainly check the missing lock ring, which sounds potentially dangerous. Maybe the sender will need to come out to check for free movement, I shouldn't have filled the tank up!

 

I have added a photo of the SII/Daimler sender with the lock ring... the SII also has the fuel sender hole in the rear wheel well!It is part number ARA1501/J but you must have one or you would not be able to fill the tank.. the photo you supplied does not show it =well.?

 

Roger, will get back inside the wheel arch and check with the assistance of your diagram which you've kindly posted - again thank you! As you say (and I can imagine) without it the tank would probably leak.

 

Finally had the chance to run the tank dry at the weekend with a great long drive. With the fuel below the sender body I disconnected the wires and released the sender from the tank.
Checking the resistance over the arc of its movement took it from 220 ohms to just under 20 ohms. With this established, and the fact that it looks new it looks there may have been something else amiss. Looking inside the tank maybe it could have become stuck on the pipes inside the tank. So not having found anything else obviously wrong I've re-inserted and will partially fill the tank again.....Fingers crossed!

 

Gizze

You must have a slightly bend rod with the float... it must be hitting something and cannot rise... I assume that you had the locking ring installed? The ohms are correct...

I had to tie a string onto the float arm once and run it to the filler hole so I could pull the arm up and observe the gauge change and see/hear the arm hitting..

 

Hi Roger,
Yes I can only think at this point that the pipes were stopping it rising. Attaching the string is a great idea - thank you. I may do that rather than filling the tank with some petrol. Appreciate your feedback.

 

Success.
Fuel sender is now working and the fuel sender re-installed with no leaks.
A big thank you Roger!