Here is a typical old unmolested SU fuel pump in a Mk2.

 

Had a play today (on my own!) just trying to keep my mind occupied. Checked fuel pessure which was a around 3 which should have been okay. Stripped down of the carbs and reset floats. Assembled, fired her up and the overflow problem now gone.
Put in a new fuel sender. No reading on the gauge. Sender has white and green stripe wire and a black and green (plus earth) Found these two wires tucked away under the carbs. Not connected to anything. Black and green striped wire and a green. Any idea where they should go and is this to do with the fuel sender/gauge issue?

 

UK wiring colour codes
https://www.autoelectricsupplies.co....ew_order_2.pdf

 

Thanks for this. Going to be a great help

 

Okay. Thanks to the chart supplied I think I have something missing! Green- Black striped wire is the Fuel gauge to fuel tank unit or changeover switch or voltage stabilizer to tank units. What would I have a switch or voltage stabiliser and where would it sit? Ron

 

Black & Green & Green wire are for the AED (Hisser or Auto enrichment device on Thermo carbs.) Seems not used on your model car.

 

Hi Glyn. Thank you for your information.
Just noticed, if you look below my thumb in the photo the bracket holding the white brake fluid bottle has two empty slots. What should be here?

 

Clutch Fluid bottle. Presume your car is an Auto?

 

No it's a manual. Been searching online for reference but as I don't know what's missing it's difficult to search

 

Well that's what the extra slot is for in the bottle bracket. Does your car have the metal container integral with the clutch master cylinder? Jaguar did mess around a bit over the years.

Like this? If so the extra bracket space is unused.

 

This is how it looked before I started sorting it out. Really sound underneath. Just obviously had many years of 'tinkering' with.

 

OK ~ so your car has the metal container integral with the clutch master cylinder. (in front of the battery)

In that case the extra bottle bracket space is unused. Many parts were made to fit multiple models & configurations.

You are not missing anything.

 

Right, so that still leaves these two wires that are colour coded for fuel going nowhere and a fuel gauge that doesn't work. If no components are missing and these are surplus to requirements then that leaves a wire problem somewhere else or gauge stuck (have tapped it) Plot thickens!

 

The trouble is that Jaguar used Green & Black wires for more than one thing. Those front wires are likely for models fitted with an Otter switch & AED. I only have a high res S Type wiring diagram color coded properly. If they follow the S Type convention then the fuel gauge should also use G/GB wiring.

The first thing I would check is that the Fuel gauge sender unit in the tank is operational. Boot under mat.

Item 26. Requires removal of some set screws. Put a meter across the terminals & move float arm up & down & see if resistance changes. If it's open circuit you know it's buggered.