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Join Date: Nov 2002
Location: Central California
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Fuel pump suggestion for carbs ?

Running dual 40 IDF's---and old one I have is shot.

So, suggestions? Brand. Source?

And---bonus question----should I keep the return to fuel tank set up like I previously used when I had the FI pump and pressure reg? Or just run the one line with no return.

Thanks in advance, guys.

p2
Old 05-19-2014, 12:34 PM
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Quote:
Originally Posted by pSquared View Post
Running dual 40 IDF's---and old one I have is shot.

So, suggestions? Brand. Source?

And---bonus question----should I keep the return to fuel tank set up like I previously used when I had the FI pump and pressure reg? Or just run the one line with no return.

Thanks in advance, guys.

p2
Our host sells a low pressure rotary pump and filter (CB performance) that is commonly used with good results,I did read an older article from Mr Harneys carb clinic ( ?) advising the use of a pressure regulator but I have no personal experience with this unit.
I run a Holley low pressure regulator ( because of my pumps capacity) and have been happy with that,good steady flow.
You won't require the fuel return with this CB unit.
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1985 944 2.7 motor,1989 VW Corrado 16v,57 project plastic speedster t4 power,1992 mk3 Golf,2005 a4 b7 qt avant 3.0 tdi,1987 mk2 Golf GTI,1973 914,2.2t to go in.
Past cars, 17 aircooled VW's and lots of BMW's
KP 13/3/1959-21/11/2014 RIP my best friend.
Old 05-20-2014, 11:00 AM
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p2....I have used the PMO adjustable pressure regulator before on many dual carb Type 4 and 6cyl 911 engines....it's pricey but has both a pressure gauge and return line fitting...works very well, very nice construction and infinitely adjustable....
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Old 05-21-2014, 08:39 AM
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Holley makes a nice low pressure fuel pump, you will want the low pressure variety for webers. a regulator may also be prudent to add.
Old 05-22-2014, 06:24 AM
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Thanks guys. That's what I did, in fact. Already had a pressure reg, so now pumping a steady 4.5 psi
of fuel to the carbs. Ball park I was shooting for, so moving on to next on the increasingly shorter 'get it running' list.

Thanks for the input.

p2
Old 05-22-2014, 08:03 AM
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your fuel bowls will most likely be spilling over at that pressure,have you had it running......just asking.
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1985 944 2.7 motor,1989 VW Corrado 16v,57 project plastic speedster t4 power,1992 mk3 Golf,2005 a4 b7 qt avant 3.0 tdi,1987 mk2 Golf GTI,1973 914,2.2t to go in.
Past cars, 17 aircooled VW's and lots of BMW's
KP 13/3/1959-21/11/2014 RIP my best friend.
Old 05-23-2014, 04:41 AM
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No, not running yet. Can't remember where I got the 4.5 psi from, actually.
Had planned on testing that very thing prior to engine re-install.

What should it be?

And thanks,

p2
Old 05-23-2014, 07:50 AM
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I run a rotary pump (with no regulator) and it maintains a steady 3.0 psi.
IIRC for IDFs you want 2.5 - 3.0 psi
Old 05-23-2014, 01:04 PM
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Quote:
Originally Posted by Kirmizi View Post
I run a rotary pump (with no regulator) and it maintains a steady 3.0 psi.
IIRC for IDFs you want 2.5 - 3.0 psi
I got spilling over and stalling at idle with 3.8 psi,better @ 3.5,settled @ 3.2 and thats where its stayed,my carbs have been rebuilt by the way.
I'am sure I could go lower and it would still be fine just haven't done it yet.
I found it was easy to pick the problem to start with,start the motor @ idle (from cold)and it will soon pick up speed blow black smoke and stall if the pressure too high.
Report back.
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1985 944 2.7 motor,1989 VW Corrado 16v,57 project plastic speedster t4 power,1992 mk3 Golf,2005 a4 b7 qt avant 3.0 tdi,1987 mk2 Golf GTI,1973 914,2.2t to go in.
Past cars, 17 aircooled VW's and lots of BMW's
KP 13/3/1959-21/11/2014 RIP my best friend.
Old 05-24-2014, 12:19 PM
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I've had good results with the Pierburg low pressure fuel pumps in my cars. The rotary design allows them to be easily fitted up front by the steering rack to help fight vapor lock (which can be a problem with the rear mounting location).
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Old 05-25-2014, 05:14 AM
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Carb Fuel Pump

I used a Mr. Gasket 3.0 PSI pump I bought at Advance Auto Parts. This is a private label of a Facet fuel pump. It works great with my Webers.

I mounted it on the back side of the tub on the passenger side to the right of where the stainless fuel line ends. I used 1/4 inch fuel line to the pump, then fed the line up and around under the battery to a fuel filter mounted on the rear of the engine bay, then into a fuel block with individual lines to the two carbs.

I ran the electrical line up into the engine bay and put a blade fuse in line before plugging it into the distributor.

This was an inexpensive way to go, and I have had no fuel issues even when at full throttle in second gear at an autocross.

Larry Steckel
1971 Porsche 914
Old 05-26-2014, 04:45 AM
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