New fuel sender fault?

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fcp
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 Working through the snagging list from my work last year I have a problem with the new fuel sender that I bought for the plastic tank (part number A0095420717 ) which seems to only register around 1/4 tank when filled to the top.

The 2 possibilities are that either the gague or sender are broken I guess. Presumably I can test the latter with a variable voltage applied to it, but I don't know what the values are - perhaps it doesn't matter since it will be between 0&12

Just wondered if anyone had any other ideas?

gav.helme
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Re: New fuel sender fault?

Hi

I think this will work to test the gauge, bridge the two wires on the sender and then turn on the ignition, the gauge should go up to full if its OK.
Was it a new or used sender? There is a small wire inside the sender that breaks off, but can be re soldered if your careful, bit fiddly.

Gav

gav.helme
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Re: New fuel sender fault?

Think i have a spare sender of that part number somewhere in my garage if you get stuck, i have repaired the said wire on that one....

fixwin38
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Re: New fuel sender fault?

Hi
Thers is no variable voltage at the sender ( fuel tank ???) ..it works on variable resistance ..you need 100% earth continuity to get the ohms right  check every Brown wire attached to a ground post on the rear chassis and the thick ground lead under the drivers side floor connecting the engine to the chassis ....under the dash over the throttle pedal there is another earthing post with a cluster of brown wires..and others on the inner front wings.. all attract corrosion over the years and then you get reduced continuity 

fcp
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Re: New fuel sender fault?

 Thanks Gav, its actually a new sender from MBV. I'll try as you suggest and report back. Thanks for the offer.

fcp
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Re: New fuel sender fault?

Hi Peter - I suppose what I meant was that the variation in resistance withih the sender, changes the output voltage to the gague, or have I got that wrong ? 

Good point about earth - easily checked. When I had the body off I did undo, cleanup and re-do all of the chassis earth mount points, but could have missed something.