6 Volt Electric Fuel Pump Conversion.

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ndnile
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6 Volt Electric Fuel Pump Conversion.

Post by ndnile » Thu Jul 07, 2022 7:10 pm

Living in the California foothills where temperatures often exceed 100 degF has me very tired of vapor lock. Yes I know about insulating the mechanical pump from the block, wrapping/re-routing fuel lines, etc, but I'm pretty set on going electric.

Some people use an electric pump as a booster inline with the mechanical pump to handle priming and vapor lock. I won't do that, I'm tossing the mechanical. Like to keep it simple-ish and it is one less thing to break, leak, clog etc.

I want to use an oil pressure driven cutoff switch for safety with a bypass switch to prime it and start it prior to pressure being build up.

Does anyone have a list of materials that they have found to work with our Carter carbs?
Where did you mount the oil cutoff switch?
Did you need a regulator?

Many thanks, Doug.
Doug
Sacramento Area
1943 Willys MB
1943 GPW-125334 (Sold)
1962 M170
1959 Willys Wagon


parker007
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Re: 6 Volt Electric Fuel Pump Conversion.

Post by parker007 » Thu Jul 07, 2022 7:23 pm

did you try real fuel yet, or av gas? best way to hook up a electric pump is off the ignition switch, some put a extra off under seat for theft. needing a pressure regulator is based on which pump(which psi) you chose.

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Re: 6 Volt Electric Fuel Pump Conversion.

Post by ndnile » Thu Jul 07, 2022 9:05 pm

parker007 wrote:
Thu Jul 07, 2022 7:23 pm
did you try real fuel yet, or av gas? best way to hook up a electric pump is off the ignition switch, some put a extra off under seat for theft. needing a pressure regulator is based on which pump(which psi) you chose.
I've vapor locked with non-ethanol fuel before and I drive it in enough places that airports won't always be available, let alone convenient.

I'll wire it up from a relay that is triggered by a combination of the ignition switch and oil pressure shutoff switch. When I go to start it there will not be any oil pressure, so I'll have switch to bypass the shutoff switch so I can prime it.

Understand about the need for a pressure regulator based on the PSI of the pump. That's why I'm hoping someone has already figured out a combination of components that work well together.
Doug
Sacramento Area
1943 Willys MB
1943 GPW-125334 (Sold)
1962 M170
1959 Willys Wagon

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Re: 6 Volt Electric Fuel Pump Conversion.

Post by mugginsmoo » Thu Jul 07, 2022 9:21 pm

I'm going to say there is something else going on here.
I'm wondering id your pump might be a bit weak, after all they are getting old nowadays.

I'm regularly in much hotter temps (closer to 120ºF) and have never faced vapour-lock.
maybe im lucky??

I do tend to run with a full tank of fuel, not sure what effect this would have.

amazon do sell a 6v fuel pump https://www.amazon.com.au/AUTOKAY-Elect ... B08HQP833N

you could add it in before the mechanical pump, that way you could use the mechanical pump until something goes awry
the just power up the electric, possibly hooking it up with a toggle switch under the dash
bot pumps will be able to push/pull fuel through each other without any hassle.
if you try to fail and succeed, what have you done?

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Re: 6 Volt Electric Fuel Pump Conversion.

Post by sjalbert » Fri Jul 08, 2022 4:22 am

Link to the same pump on the US Amazon site.

https://www.amazon.com/AUTOKAY-Electric ... B08HQP833N
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tamnalan
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Re: 6 Volt Electric Fuel Pump Conversion.

Post by tamnalan » Fri Jul 15, 2022 1:20 pm

Doug - I'm wiring in a 6v pump I bought from Summit racing. I'll do as the others say and leave the mechanical pump in. The electric booster makes reaching places like Imogene Pass more confident.

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Re: 6 Volt Electric Fuel Pump Conversion.

Post by Marty, SoCal » Mon Jul 18, 2022 8:33 am

The TM shows that the fuel pressure spec is 4.5 PSI. The Amazon pump shows its pressure is from 4 to 6 psi. Should work. Easy to add in a pressure regulator if you experience any flooding if the pump you get is more towards the 6psi range.

https://www.summitracing.com/parts/mrg-9710

Best to mount the pump as close to the tank as possible.

Chi-com components are not usually long lived, so I would try to find one old stock or made somewhere else. Also, run it with the mechanical pump, no need for a bypass switch then, plus it will still run if the electric pump craps out.

Summit has this Carter brand switch; in the Questions section a guy posted a pic of a factory wiring diagram. You can follow it and connect the wire that goes to the starter solenoid to the starter side of the foot switch. This will turn the pump on while cranking and/or once 7 psi is met. The switch can be mounted in one of the oil galley plugs on the side of the block. Be sure to fuse the wiring close to the ignition switch.

https://www.summitracing.com/parts/crt-a68301

It should be rather easy to remove the steel line from the bottom of the tank (After draining it so it does not flood out). Then install a barbed compression fitting in where the tube went:
https://www.summitracing.com/parts/rnb- ... 262ccc615a

A fitting is available to put on the end of the fuel line that used to connect to the tank. A slight bend should allow it to fit and then connect to the outlet of the pump:
https://www.discounthydraulichose.com/2 ... C%20%242.6

A local parts store should have these fittings. Barbed 5/16" hose to male and female 5/16" inverted flare. You can get them in 90* elbows, too.
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Re: 6 Volt Electric Fuel Pump Conversion.

Post by ndnile » Wed Jul 20, 2022 3:09 pm

Alan and Marty thanks.

Alan, I think I will be seeing you on the upcoming convoy.

Cheers, Doug
Doug
Sacramento Area
1943 Willys MB
1943 GPW-125334 (Sold)
1962 M170
1959 Willys Wagon

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Re: 6 Volt Electric Fuel Pump Conversion.

Post by JAB » Sun Aug 14, 2022 2:45 pm

The original fuel line is the ground for the sending unit, so if you use rubber fuel hose you'll need to ground the tank.
-Jeff

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Re: 6 Volt Electric Fuel Pump Conversion.

Post by 70th Division » Sun Aug 14, 2022 2:56 pm

tamnalan wrote:
Fri Jul 15, 2022 1:20 pm
Doug - I'm wiring in a 6v pump I bought from Summit racing. I'll do as the others say and leave the mechanical pump in. The electric booster makes reaching places like Imogene Pass more confident.

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Alan,

That is a beautiful picture of your jeep there at the pass !!!

Outstanding :D :D :D


Best Regards,
Ray

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Re: 6 Volt Electric Fuel Pump Conversion.

Post by JAB » Sun Aug 14, 2022 3:03 pm

I was there, many years ago, with my CJ5, and I'm convinced, based on the reaction of the woman involved, that we interupted a semi-nude modeling photo shoot. We stopped, took a picture of the jeep in the scenic setting, and went down the other side. They were patiently waiting for us to leave.
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Re: 6 Volt Electric Fuel Pump Conversion.

Post by tamnalan » Tue Aug 30, 2022 7:12 pm

ndnile wrote:
Wed Jul 20, 2022 3:09 pm
Alan and Marty thanks.

Alan, I think I will be seeing you on the upcoming convoy.

Cheers, Doug
Yes indeed! Great trip! Great to meet you, Bob, Tom and Dean. I got some new friends!!
Alan W. Johnson
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MB, 201453, "Lt Bob"
MB, 1942, not stock
M-100, Sep 1951
MB-TD, Mar 2012
Ford 91C, 1939


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