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 Post subject: Electric fuel pump
PostPosted: Thu May 17, 2018 9:21 pm 
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EFI Slant 6

Joined: Wed Jan 14, 2004 9:36 pm
Posts: 289
Car Model*:
If I fit an electric fuel pump to my 61 Valiant, do I stiil need to keep the mechanical pump going?

Where is the best position to fit the electric fuel pump?

How do I wire the electric fuel pump so it turns off if my engine suddenly stops - like having an accident?


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 Post subject: Re: Electric fuel pump
PostPosted: Fri May 18, 2018 4:12 am 
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Turbo Slant 6
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Joined: Mon Jan 12, 2015 5:55 am
Posts: 522
Location: Brightwood, VA
Car Model*: 1965 Plymouth Belvedere I
No, you will not really need the mechanical pump. Electric pumps are 'pushers', so it is best to mount them in the rear near the fuel tank. There are numerous electric fuel cut off switches available. They connect to oil pressure (you can run a 't' fitting at the oil gauge/light pressure sensor). Basically, when the engine stalls, oil pressure drips with it cutting the electrical feed to the fuel pump.
note: depending on the pump you use, you may need a fuel pressure regulator to keep from flooding the carb.

-Matt

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-Matt
http://www.MattmansMopars.com
Strive for Excellence, not Perfection.


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 Post subject: Re: Electric fuel pump
PostPosted: Fri May 18, 2018 12:21 pm 
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Supercharged
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Joined: Thu Jan 27, 2005 8:32 pm
Posts: 7059
Location: SW Washington
Car Model*: C1-B8
#1 best position is inside the fuel tank. You can retrofit an oil pressure switch and an inertia switch which will kill the fuel pump if the oil pressure drops or the car is hit, respectively. Unless the car vapor locks or the original fuel pump is unavailable the mechanical pump is almost always simpler and cheaper.

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Joshua Skinner
Car nut, telecom tech, tool using mammal
1954 Dodge C1-B8, 241 poly-head V8


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 Post subject: Re: Electric fuel pump
PostPosted: Fri May 18, 2018 7:14 pm 
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Supercharged

Joined: Thu May 12, 2005 11:50 pm
Posts: 5791
Location: So California
Car Model*: 64 Plymouth Valiant
I use an electric pump as a primer pump.

It's only on temporarily to prime the carb after it's been sitting awhile (or when I'm really low on gas to make sure I can make it to the gas station)

It's mounted next to the tank above the axle.

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes
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 Post subject: Re: Electric fuel pump
PostPosted: Sat May 19, 2018 6:46 am 
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Turbo Slant 6
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Joined: Mon Jan 12, 2015 5:55 am
Posts: 522
Location: Brightwood, VA
Car Model*: 1965 Plymouth Belvedere I
Joshie225 wrote:
Unless the car vapor locks or the original fuel pump is unavailable the mechanical pump is almost always simpler and cheaper.


I have used both and I definitely agree.

-Matt

_________________
-Matt
http://www.MattmansMopars.com
Strive for Excellence, not Perfection.


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 Post subject: Re: Electric fuel pump
PostPosted: Sat May 19, 2018 5:35 pm 
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EFI Slant 6

Joined: Wed Jan 14, 2004 9:36 pm
Posts: 289
Car Model*:
I like Ed's reply for my circumstances.

How is this setup done and work?

For example, if the pump only pushes fuel to prime the carbie prior to ignition, I assume it is then (manually) switcted off. When it is off does fuel still flow through the electric fuel pump to the carbie after ignition?

Thanks, Peter


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 Post subject: Re: Electric fuel pump
PostPosted: Sat May 19, 2018 6:29 pm 
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Supercharged

Joined: Thu May 12, 2005 11:50 pm
Posts: 5791
Location: So California
Car Model*: 64 Plymouth Valiant
It's a facet style pump.

Fuel flows thru it when it's off.

Manual on/off. You can get fancy and build a simple circuit with a relay and a large capacitor so it runs for 30 seconds when you first turn on the ignition or ACC circuit. Mine is on the ACC circuit, so that you can prime without the ignition being on.

_________________
Ed

64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

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 Post subject: Re: Electric fuel pump
PostPosted: Sat May 19, 2018 6:57 pm 
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EFI Slant 6

Joined: Wed Jan 14, 2004 9:36 pm
Posts: 289
Car Model*:
Thanks Ed. I think I will go with this approach.

Peter


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