walbro 255 r34 gtt install

[drifter17a]

22 minutes ago, Dose Pipe Sutututu said:

ECU fuel pump output is NOT +ve

from the ECU it's -ve

 

Look at the guide, black/yellow is + and other green/white is -

[Dose Pipe Sutututu]

go test it with a multimeter and come back tell me what the output is directly out of the ECU

 

[drifter17a]

Can’t be asked now as it is all back together but should have video it

 

how would two negative run a pump?

[KiwiRS4T]

17 minutes ago, drifter17a said:

Can’t be asked now as it is all back together but should have video it

 

how would two negative run a pump?

Of course they don't. NEO25T's high tech diagram explains it perfectly. The pump is run from the power from the battery positive which flows from terminal 30 to 87, through the pump and back to earth...when the relay is activated by the power coming from the ignition source through 85 to 86 (or the other way round as you will have discovered it matters little) and then to the ECU where it is earthed as with most things connected to the ECU.

BTW the best place for a fuse is between the battery and  #30

[drifter17a]

9 minutes ago, KiwiRS4T said:

Of course they don't. NEO25T's high tech diagram explains it perfectly. The pump is run from the power from the battery positive which flows from terminal 30 to 87, through the pump and back to earth...when the relay is activated by the power coming from the ignition source through 85 to 86 (or the other way round as you will have discovered it matters little) and then to the ECU where it is earthed as with most things connected to the ECU.

BTW the best place for a fuse is between the battery and  #30

 

Well explained so what happens when power from ecu goes then you are missing one of the sources needed( positive or negative) right?

 

if you do then it shouldn’t matter if you have a permanent ground or ecu ground

[NEO25T]

7 hours ago, KiwiRS4T said:

 

BTW the best place for a fuse is between the battery and  #30

My battery to #30 cable is 00 gauge and heavy insulated, bit overkill for 2 walbro pumps but at least its there for if i decide to relocate the battery later. 

In this case, like most cases bigger is always better ?