Temp and fuel gauge annoyance

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Joined: Tue May 21, 2019 11:21 am
Car(s): Ford Capri 2.9 Cosworth Dec 1984, reg. Feb 1985
Ford Sierra XR4x4 2.9 1992
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Location: Suffolk

Temp and fuel gauge annoyance

Post by 80s-new-man »

I’ve a new fuel gauge in 2020 that never seemed right on the gauge, reading far too high.
On a recent long journey to beaulieu I noticed the fuel needle went up then down then up again in constant straight traffic. Weird.

I’ve changed the temp sensor a few times now. I’m sick of it always reading so low it hardly gets off the bottom.
I measured voltage at loom and at sensor to block when hot. 4.6 volts at all locations.
I’ve swapped temp sensor again and yes I’ve tried white ringed and a new one from car parts in motion, which they say is a 2.8 version . I’m tired of keep changing them.

I’m just wondering - are these symptoms of fuel and temp behaviours the result of a possible faulty voltage regulator?
If so, can they still be bought?

Help most appreciated!
Capri 2.9i Special 1984 Cossie 24v BOB heart transplant
Sierra XR4x4 2.9i 1992
Jaguar XJR 4.0 SC 2001
Jaguar F-Type 3.0S sc 380
Mc Tool
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Location: Invercargill New Zealand

Re: Temp and fuel gauge annoyance

Post by Mc Tool »

I would be lookin at the reg . I think they are supposed to regulate instrument voltage to a bit over 5v. Dunno if you can still get them new but a 5v dc reg is not that hard to come by . :)
Sometimes I talk to myself ... and we both have a good laugh
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Re: Temp and fuel gauge annoyance

Post by nemo »

You need to check the voltage on the lead when it`s disconnected from the sender (temp), If that`s showing about 5v the regulator`s probably OK, it may well be that the connections to the regulator on the PCB need cleaning? Making & breaking due to vibrations while moving?
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