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Topic: fuel tank sender (Read 2543 times) |
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rob_reznik
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fuel tank sender
« on: May 13th, 2014, 11:54pm » |
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Have a dodgy fuel guage that drops very quickly and is on empty when there should still be about 35ltrs left - I'm assuming its the sender unit - can they just be bent back to correct this or will it require a new one? - anything else to look out for?
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Rob
http://www.russianmilitarytrucks.com/phpBB3/index.php
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TiberiuS
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Ex. 1996 2.3 Ultima - RIP P789 KHJ
Posts: 2257
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Re: fuel tank sender
« Reply #1 on: May 14th, 2014, 10:51am » |
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Rob,
I gotta be honest that I've not done a Scorpio, but on most other similar era Ford products the sender unit is a conductive carbon track with a metal wiper (a bit like a variable resistor) and if you can test the sender, its resistance should be quite linear along its travel.
Yes, it could possibly be suffering from dirty connections on the resistor wafer, most of them are open so you may be able to clean it and possibly bend the wiper contact a bit so it makes good contact.
I'm not 100% sure whether zero resistance means full tank but I remember that it did, so in that case a bad or open circuit at the sender could make the fuel gauge think the tank's empty.
Maybe a new one would be a better plan (I don't know how much Ford charge but I'm guessing it's a King's ransom  ) so before going that route I'd check it's not a wiring problem elsewhere in the sender circuit.
Hope this helps.
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Bruce - '07 Jaguar XKR coupe, '95 Jaguar XJ Sport 4.0, '82 Ford Capri 2.0 Ghia, '15 Honda Civic (sloooooww..)
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Scorpio_Mike
Senior Member
Jeep Grand Cherokee 3.0 V6 & 2.8 Sierra XR4i 4x4
Posts: 2354
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Re: fuel tank sender
« Reply #2 on: May 14th, 2014, 12:38pm » |
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Is the sender unit part of the pump assembly 
Got one somewhere I'm sure...no shed comments please Simmo & GOZZ 
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Simmo
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Re: fuel tank sender
« Reply #3 on: May 14th, 2014, 3:05pm » |
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As if we would 
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gozz
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Been around awhile
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Re: fuel tank sender
« Reply #4 on: May 14th, 2014, 8:39pm » |
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on May 14th, 2014, 12:38pm, Scorpio_Mike wrote:Is the sender unit part of the pump assembly
Got one somewhere I'm sure...no shed comments please Simmo & GOZZ |
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Yes Mike it,s all in one expensive lump,and unlike other makes there is no access cover in the boot floor necessitating tank removal.
I will refrain from a shed comment on this occasion
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Scorpio_Mike
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Jeep Grand Cherokee 3.0 V6 & 2.8 Sierra XR4i 4x4
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Re: fuel tank sender
« Reply #6 on: May 19th, 2014, 12:27pm » |
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I have located a spare fuel pump assembly from my 'Storage Facility'
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Sierra XR4i's are great...especially when fitted with 4WD
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Simmo
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Re: fuel tank sender
« Reply #7 on: May 19th, 2014, 1:36pm » |
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For those unfamiliar with the set up so often commented on by Gozz and Myself it is worthy of note that the search appears to have taken 5 days!! 
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Andycan
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Re: fuel tank sender
« Reply #8 on: May 19th, 2014, 3:14pm » |
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Well it is probably a big shed with parts stacked up from floor to ceiling and right up to the door lol.
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Scorpio_Mike
Senior Member
Jeep Grand Cherokee 3.0 V6 & 2.8 Sierra XR4i 4x4
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Re: fuel tank sender
« Reply #9 on: May 19th, 2014, 3:28pm » |
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on May 19th, 2014, 3:14pm, Andycan wrote:Well it is probably a big shed with parts stacked up from floor to ceiling and right up to the door lol.
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Correct on all counts !
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Star sign is Scorpio !
Sierra XR4i's are great...especially when fitted with 4WD
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