Converting FI engine to Weber carbs
11-25-2006, 05:09 PM
#1
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Converting FI engine to Weber carbs
I just purchased some rebuilt Weber 40mm IDA-3C carbs for my 2.7 engine. I understand that a much lower fuel feed pressure is required for these carbs, somewhere around 4 psi. Does anyone have any ideas about a fuel pump/regulator set up for this system? I am using a fuel cell. Where should the fuel pump be located? Also, I'm assuming that I ditch the accumulator. Thanks for any help.
11-25-2006, 05:36 PM
#2
RL Technical Advisor
Hi:
Webers require 3.5 psi of regulated fuel pressure for accurate float levels and thus, consistent running.
You can ditch the accumulator and OEM fuel filter since those are for the CIS FI system.
For a race car, you can use a Carter low pressure fuel pump mounted close to your fuel cell and use a Holley 0-5 psi FPR mounted in the engine compartment just before your fuel filter setup. I use Racor 110A fuel filters.
Hope this helps,
Webers require 3.5 psi of regulated fuel pressure for accurate float levels and thus, consistent running.
You can ditch the accumulator and OEM fuel filter since those are for the CIS FI system.
For a race car, you can use a Carter low pressure fuel pump mounted close to your fuel cell and use a Holley 0-5 psi FPR mounted in the engine compartment just before your fuel filter setup. I use Racor 110A fuel filters.
Hope this helps,
Last edited by Steve Weiner-Rennsport Systems; 11-26-2006 at 01:00 AM.
11-25-2006, 05:43 PM
#3
Banned
Originally Posted by az9oneone
I just purchased some rebuilt Weber 40mm IDA-3C carbs for my 2.7 engine. I understand that a much lower fuel feed pressure is required for these carbs, somewhere around 4 psi. Does anyone have any ideas about a fuel pump/regulator set up for this system? I am using a fuel cell. Where should the fuel pump be located? Also, I'm assuming that I ditch the accumulator. Thanks for any help.
As well - try to locate the new pump near the fuel cell. I put mine in the front trunk.
HTH!
John D.
11-25-2006, 05:46 PM
#4
Banned
Originally Posted by Steve Weiner-Rennsport Systems
Hi:
Webers require 3.5 psi of regulated ...
Webers require 3.5 psi of regulated ...
)Steve replied as I was typing my reply. And as always - his is right-on correct!!!
John D.
11-27-2006, 01:28 AM
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On my '72 the fuel pump is in the smugglers box, the regulator on the firewall/bulkhead just above the flywheel and the filters are connected to the PMO fuel rails.
No problems in the last 8 years.
No problems in the last 8 years.
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11-29-2006, 05:17 PM
#8
Burning Brakes
az9oneone,
I have a 1980 911SC and would be interested in buying your old fuel pump as a spare. email me at dbryant61@***.net.
Thanks,
Don
I have a 1980 911SC and would be interested in buying your old fuel pump as a spare. email me at dbryant61@***.net.
Thanks,
Don
11-29-2006, 07:30 PM
#9
International Auto Parts has a Facet fuel pump that is high volume [36 GPH] and low pressure [2.75- 4 PSI] that is perfect for Weber carbs. # 17017, 99.50 800-726-0555.
These are nice pumps, no affiliation.
These are nice pumps, no affiliation.
11-29-2006, 08:44 PM
#10
RL Technical Advisor
Stay as far away from those small square solid-state Facet pumps as you can; they are beyond horrible.
I've pulled a LOT of those off all kinds of carbureted cars over the past 25+ years.
I've pulled a LOT of those off all kinds of carbureted cars over the past 25+ years.
11-30-2006, 01:00 AM
#11
A 2.7L car should have CIS on it and have a Bosch recirculating fuel system.
PMO will sell you a regulator for use with your stock pump. He (Richard Parr) will also tell you to keep the stock pump - it is a lot higher quality than most aftermarket items (and costs nothing extra, and no extra time to install). The reg. has a nice gauge on it and a screw for setting the pressure. There is a normal model and an extra bling model from billet.
PMO will sell you a regulator for use with your stock pump. He (Richard Parr) will also tell you to keep the stock pump - it is a lot higher quality than most aftermarket items (and costs nothing extra, and no extra time to install). The reg. has a nice gauge on it and a screw for setting the pressure. There is a normal model and an extra bling model from billet.
11-30-2006, 06:14 AM
#12
Instructor
Originally Posted by randywebb
A 2.7L car should have CIS on it and have a Bosch recirculating fuel system.
PMO will sell you a regulator for use with your stock pump. He (Richard Parr) will also tell you to keep the stock pump - it is a lot higher quality than most aftermarket items (and costs nothing extra, and no extra time to install). The reg. has a nice gauge on it and a screw for setting the pressure. There is a normal model and an extra bling model from billet.
PMO will sell you a regulator for use with your stock pump. He (Richard Parr) will also tell you to keep the stock pump - it is a lot higher quality than most aftermarket items (and costs nothing extra, and no extra time to install). The reg. has a nice gauge on it and a screw for setting the pressure. There is a normal model and an extra bling model from billet.
11-30-2006, 06:14 PM
#13
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The PMO suggestion is a good one. It makes a very clean setup, works perfectly, and requires no changes under the car. Just get in touch with Richard.
Jim Taylor
Jim Taylor
11-30-2006, 08:42 PM
#14
Sounds like you have the skinny on the conversion, but the fuel pump I listed isn't the square cheap pump. It is the larger can shaped pump with the gold and red checkers. A quality unit that you will see on a lot of older performance cars, and a good replacement for the cheap square jobs. Cheers.
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