[Davidbolam]

Originally Posted by CTWV50

Hi David,

Just modded the sender for my build to fit it into the tank. My first question is....

How have you bolted/bonded the pump and sender unit to the tank?

and secondly.....

Surely if you earth the tank to the body when fuel causes a path of least resistance between the tank and the live wire in the tank the pump and/or sender will stop working and probably blowing a fuse or worse causing a spark in the tank??

I was thinking about this this morning after reading up on fitting a metal fuel tank. Surely the tank needs to be isolated from the body altogether?

Confused!

To install the send i used m4 ultra low profile rivnuts. I then used the rubber gasket of the sender unit that is quite thick and lots of sealant. Robo recommended some sealant that was made by 3m and resistant to almost everything. The sides of the sender were ground away slightly with an angle grinder so that I could get a flush fit.

As far as the earth goes the sender has its own earth that runs back through the cars electrics however I added another one to satisfy my IVA. The fuel pump still works with the earth attached. I think the tank is negatively earthed on an mx5.

Let me know if you find out otherwise...... (in case I blow my garage up by mistake)