Talk Morgan Forums Morgan Sports Cars Maintenance & Servicing Fuel Gauge or Sender Problem?

Yes, you have a point. However, I get chronic kick back/ cut off when I fill the car. I think I have got the tank full but I’m always carrying some doubt.

Hold the hose upside down at c 11 oclock generally helps. On my Brooklands I could get a good 5 l plus in after the first click if I filled it dead slow.
On the CX I just stop at the first click to avoid fuel running out over the paint.

+1

On my 2008 plus 4, the fuel gauge is working very well, albeit a little too optimistic in the beginnning. It starts out far above full and stays there fir a long time.

I suspect that there is an expensive PCB between the sender and the instrument. If it has falled, a cheaper fix would ve to use a fuel dipstick.

Harald

I fear you are correct Harald. Morgan appear to have inserted the MFU pcb with it’s microcontroller between the fuel sender and fuel gauge, not sure why.

Fingers crossed it’s a sender issue. Not much that can be done with this pcb if it is faulty. However as always with any instrumentation ‘funnies’ its always worth checking the two connectors. The contact resistance of those exposed connector pins will always be a potential weak point.

For what it’s worth…….
My instruments are Smiths/Caerbont.
My fuel gauge went zero but was intermittent which always makes it difficult.
Then my temp gauge went…intermittently and not necessarily at the same time.
I then realised when the instruments went then so did the illumination.

I could then reproduce the problem at will. Turning ignition on all would be ok including, with the lights on, instrument illumination. But, turn the ignition off and then back on and no instruments or instrument illumination. Main car lights were not affected. Leave for ten minutes and the whole process could be repeated.

I checked the wiring diagram ad nauseam, every earth, every connector, everything.

I bought an MFU that Rog referred to and all is now ok.

Cost aside, fitting is a doddle compared to my initial thoughts of the problem being the petrol tank sender. My car has the “immovable “ wood section across the pump/sender unit. Ugh!