Originally Posted by
ray barker
what is the eprom marty is this the chip. i might of been responsable for damaging the ecu when i re wired the fuel pump five year ago. it is posable i could of been back feeding it through the triger wire. when i first did it i couldnt get it to run unless i had the the relay pluged into the old loom and a jumper from the triger wire to my new relay. when i looked yesterday at the way i did it i could of kicked my self.so now ive abandoned the new wireing and gone back to the oe and just used the new heavy duty wire that runs the length of the car back to the pump and the supply for that is from the black and red triger wire other wise it want run or the pump runs all the time but this way everything does what it should and the supply is coming away from the ecu with no chance of back feeding. so just to make sure im getting it checked out by a proper auto electician
Correct, it's the chip.
I suspect you put +12V through pin 28 which is the FP relay earth.
The easiest way of achieving this is by using the original relay as a trigger for the new one.
Basically the original fuel pump supply becomes the supply for the new relay (in the wheel well), which itself has a new supply (protected via fuse from the battery) to the pump.
Essentially the output of the old relay becomes the input for the new relay.
Martin