Gary Casey wrote:

One thing I just remembered - It is EXTREMELY IMPORTANT to ground all electrical
devices in the fuel system and ALL LINES WITH FUEL FLOW IN THEM MUST BE MADE OF
CONDUCTIVE MATERIAL.  As Norm said below, fuel is non-conductive and that means
that skin friction will allow it to build up a static charge.  This charge can
build to very high voltages and has been known to arc through the fuel line.  The
fuel tank itself probably isn't a problem as the flow in it is essentially nil.
Don't let the appearance of some automotive plastic fuel lines fool you - they are
made from a special conductive plastic - filled with either metal or carbon.  If
the fuel pump is in the tank run a ground wire from the housing of the pump, not
just the negative terminal of the motor.  All this is especially important on EFI
systems as there is a continuous high fuel flow rate in the system.

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