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-   -   Inertia Switch (http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/946152-inertia-switch.html)

Hot Euro 02-15-2017 03:32 PM

Inertia Switch
 
I picked up an inertia switch from https://www.pegasusautoracing.com/productdetails.asp?RecID=87 and plan to install it since my air meter switch circuit is not wired and the fuel pump could continue to run in an accident. Has anyone installed one of these? Where did you mount yours?

bigtim01 02-15-2017 03:56 PM

I have not installed one on my Porsche, but I have installed one on the electric fuel pump in my 32 Ford, and I have one installed on MY Factory 5 Cobra. They can be tested by hitting the frame with a hammer. I also installed roll over shut off switches. I pick these items up at the u-pull it junk yard mostly from Ford products.
HTH
Tim

flightlead404 02-16-2017 07:32 AM

I'm not sure I'd run all the power for the fuel pumps through it. Check the switch rating. I think that's a 25A circuit. I'd use it to interrupt the ground side of a relay.

Hot Euro 02-16-2017 07:46 AM

Quote:

Originally Posted by flightlead404 (Post 9476044)
I'm not sure I'd run all the power for the fuel pumps through it. Check the switch rating. I think that's a 25A circuit. I'd use it to interrupt the ground side of a relay.

Your right. I went back and read it again:10 Amp continuous load rating allows the switch to handle the current of most electric fuel pumps (such as Facet low-pressure pumps) directly. Fuel pumps drawing 10 amps or more (such as the Bosch 044 and Aeromotive A1000 pumps) should use this switch to break contact on the fuel pump relay coil circuit.
So yes, this will be the plan.

T77911S 02-16-2017 08:45 AM

you could still wire it to the gnd side of the FP relays.
if you have the boost pressure switch you can wire it in series with that

flightlead404 02-16-2017 10:58 PM

Quote:

Originally Posted by T77911S (Post 9476165)
you could still wire it to the gnd side of the FP relays.
if you have the boost pressure switch you can wire it in series with that

I agree with this. Switches s/b low amp circuits that control power to the suitably rated relay that controls the high current pump circuits(s). Inertia, air flow, and overboost switched can be inserted between relay coil and ground.

Hot Euro 02-17-2017 04:20 AM

Quote:
Originally Posted by T77911S
you could still wire it to the gnd side of the FP relays.
if you have the boost pressure switch you can wire it in series with that

Quote:

Originally Posted by flightlead404 (Post 9477134)
I agree with this. Switches s/b low amp circuits that control power to the suitably rated relay that controls the high current pump circuits(s). Inertia, air flow, and overboost switched can be inserted between relay coil and ground.

This looks like the best way to go. Since I have no overboost relay and only 1 fuel pump relay I just need to find the best place to splice into the fp relay ground (85) wire. I have also been looking for the best place to mount the switch. I really wanted this in the passenger compartment but the kick panels have thick carpet that I don't think I want to disturb. I was looking on the passenger side of the frunk where there is a clear vertical area. This is over the right front wheel area which might be a problem. Still looking, any advise?

Ayles 02-18-2017 07:51 AM

I put mine in the smugglers box. It was easy to cleanly route the wiring and there was a nice flat surface to work with.

Hot Euro 02-18-2017 10:58 AM

Quote:

Originally Posted by Ayles (Post 9478737)
I put mine in the smugglers box. It was easy to cleanly route the wiring and there was a nice flat surface to work with.

Sounds like a good idea, wouldn't get tripped by accident, too bad my smuggler's box is full with the ac evaporator.

Hot Euro 02-19-2017 03:34 AM

Quote:

Originally Posted by Ayles (Post 9478737)
I put mine in the smugglers box. It was easy to cleanly route the wiring and there was a nice flat surface to work with.

How did you wire yours in? I was going to pull the fuse box away from the fender and splice into the fp relay ground unless I find a better way.

Ayles 02-19-2017 09:30 AM

Mine is wired in at where the fuel pump relay is on an SC. I have carbs so it's wired like an older car, pump runs with key on. Hence the need for an inertia switch. I made a nice harness for it using shrink tube and expandable sheathing.


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