E-Fuel Pumps for Carbs - Page 3 - Alfa Romeo Bulletin Board & Forums
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post #31 of 38 (permalink) Old 08-25-2018, 07:05 AM
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Quote:
Originally Posted by jacky71 View Post
What features must the pumps have for this system?
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Which pump do you use?
The mechanical pump is a stock Fispa as fitted to a 1750. The only requirement was if fuel could be pushed through the pump via external means (ie an electric pump). A look at the fuelpump flow diagram (click below) suggested that fuel arriving at the pump would open the inlet and output check valves and pass straight through the pump. The very scientific test method to check this was to blow into the inlet side. When air came out the outlet, the mech pump was deemed suitable.

For the electric pump, it needed to be able to pass fuel with only suction on the output side (engine running on the mechanical pump) with the pump turned off. Again, the scientific test method was to suck on the output side. It worked. So the pumps were hooked up in series and the rest is history.
I've long forgotten what model the Facet, pulse type electric pump is but it was originally for a carb conversion so the pressure should be close. The pressure actually does not matter as the fuel pressure is regulated by a stock Fispa filter/regulator.
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post #32 of 38 (permalink) Old 08-25-2018, 09:03 AM
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Jim's discussion above is very similar to the pre '68 V12 Ferrari method, which also used a (identical) Fispa FRB 11 regulator. The Ferrari system does include a return line with electric pump on the rear line, and mechanical on the front line. In use, the idea was to keep fuel cool to prevent vapor lock.


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post #33 of 38 (permalink) Old 08-25-2018, 04:36 PM
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@ papajam and Raymond ...this one..??

https://www.rockauto.com/en/moreinfo...sn=434&jsn=434

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post #34 of 38 (permalink) Old 08-25-2018, 04:51 PM
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I use the one pictured below, either from Phoenix Racing in Wisconsin, Centerline, or off E-Bay, whichever is handy and less costly at that time. Never had a problem with this one.
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post #35 of 38 (permalink) Old 08-25-2018, 05:45 PM
The pump I'm using came from Pierce - I haven't used them yet but I like the form factor and I've been told they are very reliable. Begs the question: Why then did we need a redundant system?
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post #36 of 38 (permalink) Old 08-25-2018, 06:08 PM
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@Tom Frasca
It looks like the Facet cube type I'm using but again, I don't know exactly which one I have.

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post #37 of 38 (permalink) Old 09-01-2018, 01:46 PM
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Quote:
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The mechanical pump is a stock Fispa as fitted to a 1750. The only requirement was if fuel could be pushed through the pump via external means (ie an electric pump). A look at the fuelpump flow diagram (click below) suggested that fuel arriving at the pump would open the inlet and output check valves and pass straight through the pump. The very scientific test method to check this was to blow into the inlet side. When air came out the outlet, the mech pump was deemed suitable.

For the electric pump, it needed to be able to pass fuel with only suction on the output side (engine running on the mechanical pump) with the pump turned off. Again, the scientific test method was to suck on the output side. It worked. So the pumps were hooked up in series and the rest is history.
I've long forgotten what model the Facet, pulse type electric pump is but it was originally for a carb conversion so the pressure should be close. The pressure actually does not matter as the fuel pressure is regulated by a stock Fispa filter/regulator.
Hi Papajam,

Thanks for your advice.

I tried to blow into my new fuel pump from inlet side, a Pierburg mech type. The air come out, I hear the membrane vibrate.
When I finish the restoration, I will try to combine an electric pump as you suggested.
Thanks
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post #38 of 38 (permalink) Old 09-01-2018, 02:40 PM Thread Starter
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So to round my venture up: against popular recommendation here I bought the cheapest and weakest fuel pump from facet (plastic type) which is rated 1,5-4psi. I did this after asking multiple reseller about quality differences between these and the cylindrical ones. They basically said that there is no difference in how they work and in how they are built apart from the benefits listed here (integrated washable filter + one-way valve, which some plastic-type also have). The posi-flow costed me almost a third in comparison to the cyl-ones so I thought I may just give them a try and report here for science ;-).

It's working now like it used to with the mech pump and I don't seem to find a difference with either the disc-type or the diaphragm type regulator. Oh and its also noticeable more silent than the cube one but that is what they state so no wonder.

Thanks a lot for all your opinions.

Learning, learning..
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