Any reason not to let the Holley run the fuel pump?

[Papa]

Keep in mind that the inertia switch, if installed per the RF instructions, is in-line with the ground side of the RF fuel pump relay. If you bypass the RF fuel pump relay, the inertia switch does nothing for you unless you move it into the "new" fuel pump circuit. You can wire in-line with the ground on the fuel pump rather than at the relay, and it will function as intended regardless of the up-stream option you elect to use.

[Blitzboy54]

Keep in mind that the inertia switch, if installed per the RF instructions, is in-line with the ground side of the RF fuel pump relay. If you bypass the RF fuel pump relay, the inertia switch does nothing for you unless you move it into the "new" fuel pump circuit. You can wire in-line with the ground on the fuel pump rather than at the relay, and it will function as intended regardless of the up-stream option you elect to use.

In all my above scenarios I am replacing the only either the 12v power source or the 12v relay trigger. The ground side of the cirucut is unchanged. Therefor any break in it (ie the inertia switch) will stop the pump.

Maybe I am missing something here but it sounds like you can wire the Holley trigger to the RF pump circuit just like you do the Coyote. When you turn the key, the Coyote software initiates the fuel pump circuit which uses the RF relay and wiring to the pump but ultimately the Coyote software is driving the bus. Sounds like you can do the same thing with the Holley software?

I can, that is essentially option 2. The location of the fuse was my hesitation. this would be the easiest solution by far. The Coyote comes with it's own fuse panel that sits in the engine bay. With the 35 pickup the fuse for the Holley is sitting right next to the transmission. It could not be replaced without a lift to access it from underneath.

[Papa]

In all my above scenarios I am replacing the only either the 12v power source or the 12v relay trigger. The ground side of the cirucut is unchanged. Therefor any break in it (ie the inertia switch) will stop the pump.

I can, that is essentially option 2. The location of the fuse was my hesitation. this would be the easiest solution by far. The Coyote comes with it's own fuse panel that sits in the engine bay. With the 35 pickup the fuse for the Holley is sitting right next to the transmission. It could not be replaced without a lift to access it from underneath.

Sorry if I'm not understanding, but the ground to the pump is not affected by the inertia switch. So, for your option #2, if you run power direct to the pump, the inertia switch will not interrupt the pump, which is chassis grounded in the RF harness. Unless you meant to run the power to the RF fuel pump relay on the feed vs. trigger, which would do the trick and keep the inertia switch in the loop.

Dave

[Blitzboy54]

Sorry if I'm not understanding, but the ground to the pump is not affected by the inertia switch. So, for your option #2, if you run power direct to the pump, the inertia switch will not interrupt the pump, which is chassis grounded in the RF harness. Unless you meant to run the power to the RF fuel pump relay on the feed vs. trigger, which would do the trick and keep the inertia switch in the loop.

Dave

No that's me being a dope. You are 100% right. I only have the switch protection if I tie it into the RF harness relay. If I move to directly power it from the Holley I have to move the switch. I had it in my head the inertia switch was tied to the ground coming off the pump. It is not, it is coming off the ground to the relay.

"Better to remain silent and be thought a fool than to speak and remove all doubt" seem relevant here.


Thanks Papa

[Papa]

No that's me being a dope. You are 100% right. I only have the switch protection if I tie it into the RF harness relay. If I move to directly power it from the Holley I have to move the switch. I had it in my head the inertia switch was tied to the ground coming off the pump. It is not, it is coming off the ground to the relay.

"Better to remain silent and be thought a fool than to speak and remove all doubt" seem relevant here.


Thanks Papa

No worries. Better to ask questions than to make assumptions.

Dave