Securing the fastener on the gas tank lvl sensor.

[engatwork]

I recently removed/cleaned and inspected my fuel tank level sending unit. During disassembly I scraped off the "varnish" like substance that was being used to prevent the nut from turning that is on the treaded rod that keeps the unit together. I need to know what I can put back on the nut to make sure it does not come off. Would nail polish work submerged in gasoline, how about varnish. This was on the E320. thanks

[Benzmac]

Use RED Loctite and let it cure. It will not desolve once dry.

[dpetryk]

Curious to know if cleaning the wires fixed the problem ?? Let me know.

[engatwork]

I'll pull it and put some red loctite on it this afternoon. Funny thing was that it only happened one time at about 1/4 tank. Once I put some fuel in it I have not seen the problem again - even after running it back down through a 1/4 tank.