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Fuel Tank Sender Sealant


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Having resprayed my fuel tank as part of the restoration of the boot area on my Herald, I need to reinstall the fuel gauge sender unit.

Mine is the type with the 6 screws holding it in, and has a cork gasket sandwiched between the sender unit and the tank itself.

Having consulted the WSM a sealant is recommended, however I tried a couple of auto factors today and couldn't find a sealant that was fuel proof.

Can anyone recommend a suitable sealant?


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Hello Karl.

Hylomar Blue should do the job, here is the spec:

Hylomar Universal Blue

Hylomar Universal Blue is the worlds leading non-setting, sealing and gasket compound. Hylomar Universal Blue Gasket Sealant is used by many of the world's major automotive manufacturers and by several Formula 1 teams. Its features include unlimited assembly time, resistance to combustion products, water, engine coolant, petroleum, lubricating oils, kerosene and fluorocarbon refrigerants.

Typical applications:

  • Water and oil pumps, instrument inspection covers, cylinder heads and cast oil pans
  • Coating pre-formed gaskets, weatherproofing motors and outdoor high voltage circuit breakers
  • Inlet manifolds, timing case covers, oil pump joints, gearbox and transmission components
  • Thread sealing, gas turbines, water-cooled generators, turbo vacuum systems and any machined flange



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