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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: 292
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: 597
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: 7119
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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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: 5870
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.

_________________
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: 597
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: 292
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: 5870
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: 292
Car Model*:
Thanks Ed. I think I will go with this approach.

Peter


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 Post subject: Re: Electric fuel pump
PostPosted: Thu Aug 02, 2018 12:33 am 
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Turbo EFI
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Joined: Wed Nov 23, 2011 11:07 am
Posts: 1968
Location: SF Bay Area
Car Model*: 67 dart 2 door hardtop
I have an electric pump, no mechanical pump. I use an inertial cutoff switch (Ford type) and I have a toggle switch cutoff as well under the dash. I have an LED under the dash that goes on if the inertial switch cuts off so that I know. Yes, nearer to the tank, if not in the tank, is best.

B

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 Post subject: Re: Electric fuel pump
PostPosted: Thu Aug 02, 2018 4:59 am 
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Supercharged
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Joined: Sat Feb 16, 2008 1:25 pm
Posts: 5327
Location: Downeast Maine
Car Model*:
Why the need for an electric pump?

If there no air leaks between pump diaphragm & tank, pump will stay primed. What usually happens, carb bowl dries for whatever reason: leaking by into or onto manifold; evaporation after extended non use; or boiling from heat soak,

Perhaps pump cam on camshaft is worn, or pump has reached its useful life where internals are old and degraded, or both.

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

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 Post subject: Re: Electric fuel pump
PostPosted: Thu Aug 02, 2018 9:03 am 
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Turbo Slant 6

Joined: Fri Apr 16, 2004 10:50 am
Posts: 636
Location: Stevensville, ON
Car Model*:
What is the reason that you believe you need an electric fuel pump?

If you only need to prime the mechanical pump, you can also set it up to only run when the starter is engaged and this would be easy to with relays, especially if you're also going to do the HEI upgrade.

I have a list of suitable electric pumps here: Vapor Lock.

You can get good relays from SSDan: Daniel Stern Lighting

_________________
1965 Plymouth Barracuda,
225 engine, Quadrajet, HEI, Dutra Duals, 904 Torqueflite, 2.76:1 axle, Addco front bar
Rods & Relics - Fort Erie, ON / Collector Car Tech


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 Post subject: Re: Electric fuel pump
PostPosted: Thu Aug 02, 2018 6:17 pm 
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SSRN National Champion
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Joined: Thu Jun 22, 2006 8:50 pm
Posts: 417
Location: Purlear, N.C.
Car Model*:
I just installed an electric pump above the tank on a 1986 Ram this week. The mechanical pump would not pull the fuel from the tank after it sat without running for a week or two unless I put gas in the carb to get it running then it would begin working. The mechanical pump is new and pumps great on the work bench. So now I just hit the electric switch for a few seconds and that is all it needs. It works great. I know the carb is leaking down after a few days, I dont know why the mechanical pump dont pull the gas with the starter unless the cam lobe is badly worn which it shouldn't be because it only has 79k on the engine. The electric pump was the easiest fix.

_________________
62 Val, 66 Dart, 70 D100, 94 Ram 2500 CTD, 16 Ram 2500 Mega


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