Inertia Switch

[RdstrRod]

OK, I've searched the archives but haven't found a definitive answer. I'm going to cut the Inertia Switch, Connector & Pigtail out of my carbureted engine's harness. What happens to the 2 loose wires, still in the harness, that I just cut the pigtail off? I do not plan to use them for any other circuit. So.... Do I need to connect the 2 wires together? Or.... Do I just cap them off separately?
Regards, Rod

[seagull81]

What type fuel pump do you have? Engine mounted mechanical or electrical? If you are using the electrical one, I would use the inertia switch in case of an accident and a line gets cut. It will turn off the pump. Mechanical, don't need it.

[McLovin]

Agree completely with seagull. If you are only cutting those out and keeping an electric pump, you are begging for trouble if you ever get into an accident.

[RdstrRod]

What type fuel pump do you have? Engine mounted mechanical or electrical? If you are using the electrical one, I would use the inertia switch in case of an accident and a line gets cut. It will turn off the pump. Mechanical, don't need it.

Sorry, engine mounted mechanical fuel pump. I know I don't need the Inertia Switch, but what to do with the 2 wires? Simple answer: Splice them together, or leave them apart??

[McLovin]

If you're not using an electric pump, I don't see any reason to leave them in your build unless you have a separate item you'd like to have wired with the key 'on', like maybe an outlet in the back of the car?

[skullandbones]

I'm pretty sure that the inertia switch breaks the circuit when it is tripped so it should work with the wires connected. If I remember correctly, I connected them temporarily to do my first start to eliminate one more variable. I had a hard time seeing if the switch had been tripped or not so I left it out at first. I'm wondering if you even need the circuit at all if you don't have EFI. If you are wire dieting, can't you strip the wires out? My inertia switch circuit was in the EFI harness and shut down the fuel pump circuit at the black box (circuit breaker). It is a Summit EFI harness.

Good luck, WEK.

[Feen]

I unplugged the inertia switch and pulled the fuse for the fuel pump circuit but left the wires in the harness in case I ever decide to do an electric fuel pump. With that said, I did not connect the wires and there is no issue.

[edwardb]

The inertia switch makes/breaks the ground wire for the relay feeding the TAN-ELEC FUEL PUMP wire in the harness. I too have a mechanical fuel pump in my Mk4 build, so I cut out the inertia switch and tied the ground wire leads from it together. Keeps the TAN-ELEC FUEL PUMP feed alive for a nice relay switched and fused (15A) circuit. I broke into it at the main harness and used it for two 12V aux outlets under my dash. I removed the fuel pump leg from the rear harness at the tank as well.

With these changes, guess that means I pretty committed to the mechanical fuel pump. :D

[rich grsc]

OK, I've searched the archives but haven't found a definitive answer. I'm going to cut the Inertia Switch, Connector & Pigtail out of my carbureted engine's harness. What happens to the 2 loose wires, still in the harness, that I just cut the pigtail off? I do not plan to use them for any other circuit. So.... Do I need to connect the 2 wires together? Or.... Do I just cap them off separately?
Regards, Rod
Dont do anything, just leave the wires in the harness, with the connector still attached. Who knows, plans could change and EFI may be a future addition.
Same as Feen