FE Power Forums
FE Power Forums => Non-FE Discussion Forum => Topic started by: winr1 on January 16, 2020, 12:46:37 PM
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I was asked about installing an inline 12 volt fuel pump to prime the mechanical fuel pump before starting
The car sits and the carb emptys, they have to crank a while to get the mill to run
They wish to install the 12 volt pump right before the mech. pump and gas tank
As in, mounting the 12 volt pump close to the mech. fuel pump ...
Use a toggle switch to prime, start mill then turn off 12 volt pump
Ricky.
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I use one of the cheap ($40.) holley pumps but mount it back under the tank as those pumps are more of a pusher than a puller. It's only another 10' of wire.
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The electric pump would have to have the ability to flow gasoline through it when not powered.
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+1 on the above comment. I put an electric pump in-line on my ECTA car and found out, to my dismay, that it overloaded the fuel line when on and was a significant 'pinch-point' when not running.
Why not remove the mechanical pump entirely and put a properly-sized electric pump in place as the primary?
KS
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I was asked about installing an inline 12 volt fuel pump to prime the mechanical fuel pump before starting
The car sits and the carb emptys, they have to crank a while to get the mill to run
They wish to install the 12 volt pump right before the mech. pump and gas tank
As in, mounting the 12 volt pump close to the mech. fuel pump ...
Use a toggle switch to prime, start mill then turn off 12 volt pump
Ricky.
I have a new Bosch pump for a 1990 E-250 along with a Demon Tweeks fuel pressure regulator. I think it is 0-20 lbs capable of a 120 psi pump. I do not have it in front of me for a part number reference. The frame pump primes on its own but I will likely put a lift pump in the tank anyway.
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How long does the car sit, to cause the carb "to empty"? What type of carb? My race car can sit all winter, and the Holley still has enough gas to start it up in the spring. Although I have always used electric fuel pumps on my race cars, but like the simple and reliable operation of a mechanical pump for street vehicles. Having an non running electric pump between the gas tank and mechanical pump would concern me as a potential restriction, and if the electric pump may possibly cause issues by "force feeding" the mechanical pump.
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I use the cheap Holley to fill the carb as the car sits a lot. After The car fires, I switch the electric one off and the mechanical pump pulls the fuel right through it no problem. If I am going to run the car hard I switch the electric one on just to help out.
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I'd put a Mallory 70 and filter in the back and toss the stock mechanical unit.
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A bypass from inlet to outlet of the electric pump could solve that flow issue.I do believe
the mechanical pump can leak by for a fill to the carb.
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yes the electric pushes fuel right thru the stationary mechanical pump and the mech. pump pulls thru the de-energized electric. win-win.
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Thanks for all the info an suggestions guys :-)
Which cheap holley pump did ya use shady ??
Ricky.
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12-426
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Thank ya Shady :-)
Forgot ...
70 4 door LTD... 351 Windsor... 2150 carb.... 37,000 miles
Ricky.