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Old 04-07-2021, 07:44 PM   #1
Don
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Default Fuel pump just as a pass thru

What’s a safe way to just use .org, fp as a pass thru using a electric pump??
Do you need to remove the check valves ?? Replace dia.with a plate ?.
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Old 04-07-2021, 08:29 PM   #2
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Default Re: Fuel pump just as a pass thru

Just leave it stock. I have used boost pumps running thru the stock pumps on many cars.
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Old 04-07-2021, 09:08 PM   #3
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Default Re: Fuel pump just as a pass thru

Ditto on leave it stock. That way, if the electric fuel pump fails, you get home. Just be sure to use an electric fuel pump that does not block flow when it is off. I use Mr. Gasket 42S because it puts out only 3 psi which won't flood a flathead. Mine is 12 volt. Not sure if you can get it for 6 volts.
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Old 04-08-2021, 07:44 PM   #4
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Default Re: Fuel pump just as a pass thru

That's fine until a diaphragm splits and you fill the crankcase up with fuel.
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Old 04-08-2021, 08:56 PM   #5
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Default Re: Fuel pump just as a pass thru

That what needs to be avoided,any ideas,,put a stainless disc in place of rubber ?.
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Old 04-08-2021, 10:06 PM   #6
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Default Re: Fuel pump just as a pass thru

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Iirc, Vic Piano modified a fuel pump for pass through.
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Old 04-09-2021, 06:58 AM   #7
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Default Re: Fuel pump just as a pass thru

Use a metal disc and use Viton, EPDM
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Old 04-09-2021, 09:14 AM   #8
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Default Re: Fuel pump just as a pass thru

Quote:
Originally Posted by 1952henry View Post
Iirc, Vic Piano modified a fuel pump for pass through.
Vic Piano did the conversion and detailed it in his thread entitled "What I did on my lunch hour". The problem is that only the most recent 20 pages of that thread are archived and available. He did the conversion prior to about 2015 and we can't read back beyond that time.
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Old 04-09-2021, 09:57 PM   #9
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Default Re: Fuel pump just as a pass thru

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Originally Posted by JSeery View Post
That's fine until a diaphragm splits and you fill the crankcase up with fuel.
Good point. But that is a risk that is avoided by rebuilding the pump with a kit using ethanol resistant materials, and an electric pump that puts out less pressure than a stock fuel pump - which is about 4 psi.
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Old 04-09-2021, 10:53 PM   #10
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Default Re: Fuel pump just as a pass thru

Vic did one as mentioned. The concept is pretty easy. Remove either the fuel pump rod or the lever action unit in the fuel pump, then replace the diaphragm with a tin plate.


I don't like the sound of a electric pump so I use a mechanical. I'm not saying doing it either way. But if the motor dies for some reason the mechanical pump stops. Electric will keep pumping gas even if the motor is upside down. So now we are into enrsa setups...


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