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Thread: Diesel sender unit

  1. #1
    Consultant JayHoe's Avatar
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    Default Diesel sender unit

    I have just got my new genuine diesel sender unit. The terminals are marked W and L (I think, I have sealed it and packed it awy safely!). W is Warning and L would be level, yes?

    P9130150.JPG

    Also, the manual says its earthed thru the tank fixings, but there is a third terminal that I assume is an earth - is this just a belts and braces improvement?

    Lastly, how do you go about fitting and setting the unit? The manual only talks about reinstalling an existing one, not setting up a new one.

    Thanks all (as ever!)

    J


    1972 Series III SWB, "Hannah Belle" Rebuild -> http://www.landrovernet.com/forum/showthread.php?t=119456

    "Hannah Belle", Europe trip and over the Alps -> http://forum.landrovernet.com/showth...p-and-a-naming...







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    Engineer conkers's Avatar
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    Default Re: Diesel sender unit

    Took mine out this morning and yes wiring is as you say. White/green wire to W terminal black/green wire to L terminal and the last one is earthed to one of the tub ribs on my 109 so not sure where it would go on an 88 anywhere practical I suppose. The 109 tank has rubber mounting bushes which in theory might isolate the tank from the chassis so it's a good idea.
    I can't help with calibrating though, Snagger has calibrated his, it may be on his blog.



  3. #3
    Consultant JayHoe's Avatar
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    Default Re: Diesel sender unit

    Cheers conkers, much obliged.


    1972 Series III SWB, "Hannah Belle" Rebuild -> http://www.landrovernet.com/forum/showthread.php?t=119456

    "Hannah Belle", Europe trip and over the Alps -> http://forum.landrovernet.com/showth...p-and-a-naming...







  4. #4
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    Default Re: Diesel sender unit

    Mine has W and a T terminals (and prior to strip down had an earth strap from one of the fixing screws to the chassis)

  5. #5
    Consultant JayHoe's Avatar
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    Default Re: Diesel sender unit

    So pretty easy really! What about sealant? I have new gaskets, but the manual mentions using a fuel friendly sealant. Ideas?


    1972 Series III SWB, "Hannah Belle" Rebuild -> http://www.landrovernet.com/forum/showthread.php?t=119456

    "Hannah Belle", Europe trip and over the Alps -> http://forum.landrovernet.com/showth...p-and-a-naming...







  6. #6
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    Default Re: Diesel sender unit

    Silicone RTV is fuel friendly.

  7. #7
    Consultant JayHoe's Avatar
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    Default Re: Diesel sender unit

    Hi Diff - what does RTV stand for please?

    Also, can anyone please tell me about setting the sender up please!


    1972 Series III SWB, "Hannah Belle" Rebuild -> http://www.landrovernet.com/forum/showthread.php?t=119456

    "Hannah Belle", Europe trip and over the Alps -> http://forum.landrovernet.com/showth...p-and-a-naming...







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    Default Re: Diesel sender unit

    I'm sure somebody more knowledgable will be along shortly with regarding setting it all up properly from new - I've only ever fitted/re-fitted old ones.....

    ....but I can honestly say that no matter how many times I tried to get my damn sender/fuel gauge to read accurately for fuel I failed dismally....I tried bending the wire to make the float sit differently etc but I either got a guage that read accurately for the top 1/2 of a tank or the bottom 1/2 but not both at the same time....so don't be too worried if it seems not to work in a linear fashion....like you can do 200 miles on the first 1/2 tank and then 50 miles on the remaining 1/2



    edit: In fact my modern jap truck is as bad, the bottom 1/4 tank mark actually means you have about 50 miles of fuel left whereas you can do 150 miles on the top 1/4 tank!!!

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    Consultant JayHoe's Avatar
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    Default Re: Diesel sender unit

    Actually that makes sense Ian. As the arm swings in an arc, it would be more vertical at first and drop quicker and as it goes lower it would be moving in a shallower gradient. As the manual talks about marking the location when removing the sender, I guess the direction its pointed in is important but no mention is made!


    1972 Series III SWB, "Hannah Belle" Rebuild -> http://www.landrovernet.com/forum/showthread.php?t=119456

    "Hannah Belle", Europe trip and over the Alps -> http://forum.landrovernet.com/showth...p-and-a-naming...







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    Default Re: Diesel sender unit

    the float sits at the end of the tank with the sloping top (rear of vehicle) normally with the float wire running pretty much parallel with the side of the tank and in mine the float itself is horizontal pointing to the centre of the tank but I know that you have a custom tank. I assume your sender is still mounted (like mine) near to the front though isn't it? so it is easy to access from under the seat?

    edit: PS, I've not used sealant before, I think all of mine have been fitted with just the gasket.

  11. #11
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    Default Re: Diesel sender unit

    RTV stands for Room Temperature Vulcanising.

    RTV Silicone is stuff like instant gasket.
    It think Loctite call is RTV Sealant, among others...

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    Engineer erubus's Avatar
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    Default Re: Diesel sender unit

    read the tube first though. A lot of RTV sealants say they are not suitable for immersion in petrol/diesel or for constant exposure. I have often wondered what RTV stood for as well. learn something new every day.

    p.s: my fuel guage reads maybe 80 miles for the first half and around 120 for the empty half.

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    Consultant JayHoe's Avatar
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    Default Re: Diesel sender unit

    Mud, I am going to continue using the original tank, it has tons of life left in it, and store the other one. Thanks for the info Diff. I will check what sealants I have and see what they have to say about fuel.


    1972 Series III SWB, "Hannah Belle" Rebuild -> http://www.landrovernet.com/forum/showthread.php?t=119456

    "Hannah Belle", Europe trip and over the Alps -> http://forum.landrovernet.com/showth...p-and-a-naming...







  14. #14
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    Default Re: Diesel sender unit

    As Erubus said, some sealants are fine being submerged in petrol (I think the orange instant gasket, and the Loctite Blue RTV are both OK), but some arent.

    I have used the orange instant gasket (Hammerite own it I think), for head gaskets, without a problem.

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    Default Re: Diesel sender unit

    Calibration is by bending the wire arm so that the gauge reads full when the float is touching the top of the tank. You may find as I did that the diesel effects the resistance of the rheostat, so it may need to be done with a full tank, removing and refitting the unit until set correctly. It depends on how fussy you are, but by the standard you've shown so far, I think you're going to be smelling of diesel for a couple of days!

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