Fuel level indicator

[clark_sas]

So I am in the process of getting the fuel tank in order and my question is this: Can I/should I use either varnish remover or muriatic acid whilst the electrics for the fuel pump are still in the tank. Should I removed the fuel level indicator prior to adding either of the above? Will they harm the electrics?


Thanks! I am finally getting around to making some progress on this restoration!

[BrickMW]

I would recommend using white vinegar to clean your tank. It works surprisingly well and will not harm the internals.


It would be difficult to effectively fill and soak the tank without the fuel sender in place to seal the bottom of the tank, It would be possible I suppose to make a blank-off plate with the correct hole pattern and use that as a temporary stopper.


Be gentle with the wiring for your fuel pump, the insulation can be hardened and brittle.

[clark_sas]

Great! Thank you, I will give the vinegar a try!

[BrickMW]

I would remove the pump and any rubber parts / hoses before you soak it.


Soak the pump in a separate container without the damper/screen/mount. Pump is likely not salvageable, but you might get lucky.. :dunno2:

[clark_sas]

Yes, already removed pump and will be adding the white vinegar this weekend. Tried to jump the pump after removal, I got a nice solid clunk. Assumed it was seized and ordered a new Enduralast from EME. Hopefully it will be good to go after vinegar clean and re-assembly...


Thanks for your response!

[Martin]

Pumps can sometimes be resurrected by soaking in vinegar, might take a week or two. If the pump is making an attempt to go, reversing the polarity of the wires briefly back and forth will sometimes break them free. A mate also had success freeing one by upping the voltage to 18V very briefly and doing the same.
Regards Martin.

[rbm]

The corrosion on the fuel level sender is severe.  Remove that unit once you've cleaned the tank and try to follow my instruction on refurbishing that sender.  They are found on the K100-forum site.  Use google to look for "Messing with the in-tank fuel sender".

[clark_sas]

Thank you! Will do. So far the tank has been soaking in vinegar for about 3 days and the results are excellent. Once I am satisfied with the final result I will pull the fuel level indicator and follow the procedures you've very posted. I will finally get to work with that multimeter again!
Thanks again, I will post some photos of the tank once the vinegar has done its job.

[clark_sas]

Thanks Martin, I will also soak the pump and see if I can bring it back to life.