Wiring an electric fuel pump - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

 
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post #1 of 7 (permalink) Old Apr 24th, 14, 7:51 AM Thread Starter
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John
 
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Wiring an electric fuel pump

I plan to run my fuel pump from a relay. Could I use the tach signal from my MSD box to turn on the relay, as a safety measure - no RPM = no fuel pump?
John

'67 Elky - 496 / TH400
----------------------------
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post #2 of 7 (permalink) Old Apr 24th, 14, 4:29 PM
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Re: Wiring an electric fuel pump

how would it work for startup when the car isn't running yet?

Ben R.

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post #3 of 7 (permalink) Old Apr 24th, 14, 5:04 PM
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autumngold
 
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Re: Wiring an electric fuel pump

Always run a fuel pump safety switch,its mandatory on most tracks.Get the painless fuel pump relay and wire it into the circuit with the switch,i think the last one I hooked up was into the starter circuit.The schematic comes with the switch and relay.No oil pressure,no fuel pump.

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post #4 of 7 (permalink) Old Apr 24th, 14, 6:39 PM Thread Starter
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Re: Wiring an electric fuel pump

Quote:
Originally Posted by RAMBO View Post
how would it work for startup when the car isn't running yet?
Carburetor.

'67 Elky - 496 / TH400
----------------------------
"Democracy is two wolves and a lamb discussing what's for dinner. Freedom is a well armed lamb contesting the vote" Benjamin Franklin


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post #5 of 7 (permalink) Old Apr 24th, 14, 6:40 PM Thread Starter
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John
 
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Re: Wiring an electric fuel pump

Quote:
Originally Posted by marcrose View Post
Always run a fuel pump safety switch,its mandatory on most tracks.Get the painless fuel pump relay and wire it into the circuit with the switch,i think the last one I hooked up was into the starter circuit.The schematic comes with the switch and relay.No oil pressure,no fuel pump.
Ok. I'll take that as a 'no'. It was to be temporary, not long term.
John

'67 Elky - 496 / TH400
----------------------------
"Democracy is two wolves and a lamb discussing what's for dinner. Freedom is a well armed lamb contesting the vote" Benjamin Franklin


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post #6 of 7 (permalink) Old Apr 24th, 14, 7:02 PM
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Re: Wiring an electric fuel pump

No. If it's an MSD 6al, the tach "out" is a digital signal, a square wave with 20% duty cycle for signal.

The "typical" set-up usually involves buying an oil pressure sender with extra contacts. With oil pressure, the contacts allow a current to flow thru a relay's coil which in turn switches power to the fuel pump.

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post #7 of 7 (permalink) Old Apr 25th, 14, 8:01 AM Thread Starter
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Re: Wiring an electric fuel pump

I was looking for shortcut that would be safe for temporary use. I guess the oil pressure switch is the way to go.
John

'67 Elky - 496 / TH400
----------------------------
"Democracy is two wolves and a lamb discussing what's for dinner. Freedom is a well armed lamb contesting the vote" Benjamin Franklin


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