Does it blow when the fuel pump relay is removed? Does it blow when the
fuel pump connector underneath is disconnected.
Something is shorted. Your job is to find where it is, by breaking the
path at various places along the line and noting the behaviour.
Could be related, if you have a multipin conector failing, or a cable
bundle being cut. Find the fuel pump problem first, then you might
find the speedometer problem too.
"C'est un Nagra. C'est suisse, et tres, tres precis."
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