atwood1

on my 87 mustang i have no fuel pump power i have replaced all the relays including the eec relay i turn the key and no fuel pump my fuel pump works tho because i tested it Any Ideas please help

mjr46

have you checked for power to the fp relay under the seat?

atwood1

yea there is power to it there is supposed to be a power and 2 grounds and there is a power and a ground and i cant find any broken wires but if i hot wire it the pump will turn on

mattdel

inertia switch

atwood1

where is that

SonicBlueFiveSlow

In the back attached to the tail light panel I believe.

atwood1

ok sounds good i was also told by the drivers tail light there is a shut off switch i can check

SonicBlueFiveSlow

I edited my post, the intertia switch is by the drivers side tail light...I don't know why I said under the drivers seat lol.

atwood1

ya i saw that right after i posted that

mjr46

if the inertia switch is not tripped then you need to see why the ecm is not grounding the relay coil for the f relay....there should be a larger gauge wire hot and the one that becomes hot when relay windings are pulled in which then makes the wire to FP hot hence FP operation....the two smaller wires = 1 switched 12 for relay windings and the other is the ecm ground for windings = controlled by ecm when PIP is seen, PIP is generated/filtered by the tfi on the dizzy, stator in the dizzy Id's tdc and tfi transmits info to ecm where it is all interpereted as inputs and from there ecm performs output functions such AS grounding the windings to the fp relay