200 hp efi eletric fuel pump

M

magnumsigns

Recruit
Joined
May 20, 2012
Messages
2
I have a 97 mercury 200 hp EFI if I turn the key on fuel pump does not turn on if I put a ground wire from case to ground side on pump, pump will come on and motor will crack and run. traced wires back to selnoid. is the selnoid bad on the ground side or could it be something else.
 
Faztbullet

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,937
Re: 200 hp efi eletric fuel pump

The ground side of pump is a floating ground controlled by the ECU internally(fuel driver circuit). If the pump runs as you stated the ECU has a problem..
 
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