A spark from a a fixing upon start up

[matlee]

Finally finalised the positions and fixed down the electrics on my current build (MEV Exocet). It starts ok but ive noticed that one of the fixings (metal P clip) holding a copper brake line to the frame (rear of engine bay) produces a spark before the engine fires. Why is this happening and what would be the solution?

[Ferg]

I'd say you have a positive potential on that brake line. Is it touching something it shouldn't be somewhere??

[GTRCLIVE]

Be careful Brake fliud has the lowest ignition temp of any fluid in a Car...

Hows your engine earth ??

[matlee]

Thanks for the speedy reply Ferg. Ive wrapped up for the day but first thing tomorrow morning i'll check all the lines to see if they are in contact with anything

[Ferg]

GTRCLIVE said:

Hows your engine earth ??

That's worth checking. A lot of current during cranking, but I'm surprised the brake lines are involved.

[andypg]

make sure your earth straps have good contact with bare metal.to be safe,add more earth straps,especially from engine to frame.Andy.

[Mr2Mike]

Surely a metal P clip will have a rubber sleeve between it and the brake line (otherwise it'll be an IVA fail)?