Fuel gauge goes to zero when I brake

Good morning,

That's it, when I hit the footbrake the fuel gauge goes down to empty, just as if the ignition was completely switched off. Before I start tracking through the wiring, can anybody tell me the most likely place to look?

Many thanks!

Does it do it when the vehicle is stationary.

good question mr grunt

Why thank you for the compliment my dear Mr Slob.

thats k don't mention sir. i just thought the question in question was so well thought out it needed some reconnition of the fact it was a well thought out question. as the answer would point one to either of a set of possible causes
A/ those that will only happen when vehickill is stationary and by that i dunt mean a piece of paper nor a nvelope
B/ those that would happen when the vehicill is not stationary i.e. not a nvalope
or C/ those that would happen when vheickill is both stationary and not stationary

so we shall wait with baited fish lines on the answer to your most bodaicious question

Er yep, it does it when stationary, when not stationary, when moving and when stopped.

I think thats C

Is that bad, doctor?

It gets better when I take my foot off the pedal

mine goes down a bit when i put my foot down hard or brake hard come to think of it while cornering to infact i never think i have got as much fuel as i actualy have lol but i think its meant to do that its a land rover thing

It sounds like you've got a big voltage drop when the brakelights are on.

A multimeter wil confirm that.

Then chase where the short is.

I'd go for the bulbs first, always seem to be the delicate bit in electrics.

would a dodgy voltage reg cause this?

It may well be. But however do you think it could be a poor live feed or earth to the brakes or fuel gauge sender, causing the power to the fuel gauge to be reduced when the brakes are operated.

yes mr grunt i do agree with you that that may be the cause of this issue. however i would like to point out that my tea is ready

Oh how absolutely marvelous, on that happy note I shall pop out to the Slaughtered Lamb, get absolutely sozzled then come back on here an post a load of tosh.

aye ah might go to "the shakin head" fer a pint or two of heavy metal

Well gentlemen, I thought the most likely thing would be a dodgy feed, if there wasn't enough leccy geting through then the lights would take it all and the fuel gauge would get nothing. (Because the rear lights are on the same fuse as the gauges, don't know why).

So I was very pleased to find that the fuse in question (No 5 I think it was) was all corroded, maybe some water had got in there some time (quite often i expect!). So I cleaned it all up nicely and it made no difference.

Next I went to the lights, and the problem turned out to be a poor earth in the left hand stop light unit.

I cannot quite work out why a poor earth would cause this problem, cos surely that meant the light wasn't using much power - it was a bit dim - but anyway that did the trick.

btw I like the new pictures mr grunt / mr slob

the bad earth would have made it use more power, as the joint has a high resistance, which requires more power to overcome.

redwonten said:

btw I like the new pictures mr grunt / mr slob

Click to expand...

Fecking Creep. it won't save ya you know there like a pair of pet rottweilers you think you know them but 1 tiny mistake and they'll rip ya to bits.

Ooooooooooooh I don't know what you mean you awful chap.

shirley he dint mean us mr grunt???