[RXtacy]

Originally Posted by TitaniumTT

You assume correctly. It's incredibly rare for an ECU output to NOT latch to grnd. Can be confirmed in the diagram by following the ign switch back to positive.

Figured.

Be careful with the circuit opening relay. I would be surprised if it didn't power more than the FP relay and resistor.

I'll trace the wire.

Yes, take the W/R from X-10 and move it to the ECU. In stock form the would've been positive, now it will be the relay trigger signal. When you go dual pump we can get overly fancy like I did and modify two aircraft safety switch's and a pair of SPDT toggle switch's to control the pumps independantly.

I would start at the relay block and work backwards regarding the L/R. It might be used for more than just the FP. If it's not, than what we can do is, because of the physical location of the Circuit opening relay, we can plan to use that for the lift pump, because that will be a stock pump with zero pressure and little draw, use the circuit opening relay and factory fuse in that module for the lift pump.

In that case I would use the B/LG wire that jumps between the EGI and the Circuit opening and cut the jump, find something similar in your tefzel stock and run that over to the ECU. Use the L/R as the power for the lift pump, and split the B/LG before the module to go to the dual SPDT switchs.

*Note - the switch's aren't necessary at all, although I've found them very useful. The way to wire them is the common terminal (middle) goes to the gnd side of the coil for the relay. The position that would be closed when the safety cover is closed hooks to the ECU. The other terminal (cover up, switch up) connects to gnd. **Note - this is an on (mom)-off-on switch** So you can close the cover and the ECU controls it. Flip the cover up and center the switch breaking contact. This allows pressure to be bleed off. Of flip the switch up to the mom position and prime the system. It allows you to fill the surge tank manually to avoid damage to the main pressure pump.

Logical? Sensical?

Mostly. Not 100% following the SPDT switches, but I get the gist of what your saying.