Not much of an auto electrician. Was after some help please. When I turn my ignition on, I get a reading from my fuel gauge. (Built into the big central speedo) Once I start the car, the fuel gauge drops back down to zero?

I assume it may be a grounding issue somewhere. It may have something to do with the installation of the second fuel tank?

A nudge in the right direction would be much appreciated.

Check your earths, could possibly be the voltage stabiliser, which is mounted on the back of the speedo, ( its a small rectangle metal canister with 4 pins coming out of it )
I doubt that the second tank would have anything to do with it. I had a problem with the voltage stabiliser in my car ,where gauge was only reading half full, also the temp gauge
would only read about a quarter, changed it and now they both read normal, but in saying that ,every now and again both gauges decide to not work and they drop back to zero.

Voltage regulator/ stabiliser thingy i reckon

_________________

Master of the Moggie Army & Founder of Awesomestock2010

Check your fuses and also make sure everything else that works of the ignition still works like Indicators, Stop lights ands wipers. Mighty be a fuse box problem. Measure some voltages at different points.

_________________
DID I MENTION THAT I AM THE BEST SUPPLIER FOR MINI ELECTRICAL PARTS AND REPAIRS?
"Let us remove your "SHORTS"

I bought a voltage rectifier from MiniSpares. So old problem was ignition only on, fuel gauge fine. Start the car, fuel gauge turns off. I installed the new part, which only has two terminals, B and I. Now the gauge doesn't work at all. Have put the old one back in for now.

Any ideas helpful people???

check the sender in tank i just changed one and no more sitting on half tank when its full

$45 at mg spares at smithfield nsw

They are a 3 terminal device. You need to Earth the case. B is +ve and I goes to the gauge.

_________________

Thanks mate. I had earthed the case, but I think the problem is the labels on the old unit. B on the old one went to the gauge. Will try the new one the other way around.

Cheers.