electric fuel pump shut off switch - Team Camaro Tech
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post #1 of 10 (permalink) Old Nov 13th, 18, 08:17 AM Thread Starter
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electric fuel pump shut off switch

OK, so I'm running an electric in-line fuel pump and it's currently wired as per manufacturer specs with a fused line running from the battery + to relay, a keyed ignition source running to relay and the 'hot' line running from relay to fuel pump with pump grounded to chassis.

my question is this;
since the relay is triggered by the ACC post on the fuse box, the pump runs whenever the key is in the 'ON' or 'ACC' position. i'd like to run an in-line shut off so i can work on or test other electrical equipment without having the pump running full time. can i run a toggle switch in-line with the wire off of the fuse box 'ACC' and hide it under the dash to shut off the fuel pump when wanted?


i originally wired my ignition source in-line with my radio as a security measure for against theft...turn off the radio and fuel pump shuts off. well I'm also powering 2 amps from this source and recently installed a new radio that i was afraid of overloading with all that draw so ran the fuel pump direct to the 'ACC' post.



now when i want to fiddle with the radio or anything else, i have the fuel pump running......not good.
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post #2 of 10 (permalink) Old Nov 13th, 18, 10:00 AM
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Re: electric fuel pump shut off switch

Yes you have the correct idea. A single throw toggle switch will do what you want.

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post #3 of 10 (permalink) Old Nov 13th, 18, 10:04 AM Thread Starter
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Re: electric fuel pump shut off switch

that's what i thought. thank you
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post #4 of 10 (permalink) Old Nov 13th, 18, 11:14 AM
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Re: electric fuel pump shut off switch

On a 69 (don't know about 67,68) the IGN spade is hot when in run, not hot in ACC. ACC is hot in both positions as you know.
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post #5 of 10 (permalink) Old Nov 13th, 18, 02:43 PM
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Re: electric fuel pump shut off switch

Good suggestions of Dave and Al, you could power relay coil by using the IGN spade on fuse panel, but won't be secure as using radio power.

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post #6 of 10 (permalink) Old Nov 13th, 18, 03:58 PM
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Re: electric fuel pump shut off switch

Yes, can be done.

I have a hidden micro toggle switch wired in just like you're wanting to do.

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post #7 of 10 (permalink) Old Nov 14th, 18, 04:10 AM
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Re: electric fuel pump shut off switch

Quote:
Originally Posted by bhodgdon400 View Post

i originally wired my ignition source in-line with my radio as a security measure for against theft...turn off the radio and fuel pump shuts off. well I'm also powering 2 amps from this source and recently installed a new radio that i was afraid of overloading with all that draw so ran the fuel pump direct to the 'ACC' post.



now when i want to fiddle with the radio or anything else, i have the fuel pump running......not good.
You'd be fine keeping it this way, since you are using this radio lead as the "trigger" for the relay that then powers the fuel pump. That's how a relay works. It uses a low current "trigger": to operate the relay that supplies a higher amp lead to the source (in your case, the fuel pump.

If I may ask, what electric fuel pump are you using? Is this for a fuel injection setup?

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post #8 of 10 (permalink) Old Nov 14th, 18, 05:15 AM
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Re: electric fuel pump shut off switch

I did the same thing on my Camaro and hid the switch in the interior so if someone tried to steal it they would be 5h1t out of luck!!! LOL!!!
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post #9 of 10 (permalink) Old Nov 14th, 18, 05:49 AM Thread Starter
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Re: electric fuel pump shut off switch

Quote:
Originally Posted by bucko View Post
You'd be fine keeping it this way, since you are using this radio lead as the "trigger" for the relay that then powers the fuel pump. That's how a relay works. It uses a low current "trigger": to operate the relay that supplies a higher amp lead to the source (in your case, the fuel pump.

If I may ask, what electric fuel pump are you using? Is this for a fuel injection setup?



using Edelbrock quiet flow 160 GPH external in-line pump. carb set up.
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post #10 of 10 (permalink) Old Nov 14th, 18, 09:15 PM
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Re: electric fuel pump shut off switch

I had a hidden switch in my C10 truck that would cut the ground to the fuel pump and it would not work. I liked this a lot better no chance of an accidental shock.

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