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Registered
Join Date: Jul 2001
Location: mt. vernon Wa. USA
Posts: 8,731
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CIS to CARBS - Fuel Pump
Hi,
As soon as I install my new Facet fuel pump and complete some minor plumbing tasks I'll be ready to fire up my 77S w/carbs. Can't wait!! Fire extinguisher at the ready. Question #1: If I use a 3-5 PSI fuel regulator, can the fuel pump from the CIS unit still be used? Or is using a low pressure unit like the Facet a must? Question #2 Where have you all mounted your fuel pumps when making this transition. At the tank, directly replacing the stock pump, or in the engine compartment. I guess i've seen/heard of it done either way. Any advice?? Thx, Al 
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04-30-2003, 06:27 PM
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Registered
Join Date: Jul 2001
Location: mt. vernon Wa. USA
Posts: 8,731
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bump
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[B]Current projects: 69-911.5, Previous:73 911X (off to SanFrancisco/racing in Germany).77 911S (NY), 71E (France/Corsica), 66-912 ( France), 1970 914X (Wisconsin) 76 911S roller..off to Florida/Germany RGruppe #669 http://www.x-faktory.com/ |
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04-30-2003, 06:57 PM
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Registered
Join Date: Jun 2001
Location: Central Florida
Posts: 1,409
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I don't think you want to regulate down your high pressure fuel injection pump.
Several things to consider... 1. Fuel flow rate. - Some of the facets can keep a constant pressure, but not provide enough flow (gallons per hour) 2. There are other types of pumps avaialbe (rotary pump, Bosch fuel pump for early 911 carbs (pricey). 3. Some of the pumps suck better than then they flow and vice versa. A lot depends on where you mount the pump in relation to the tank. For example, I've been told that the rotary pumps to suck well, but they flow well, so they are ideal under the mid-line of the fuel tank. 4. You can also go aftermarket (Holley Red pump). 5. Check with the folks at PMO and see what they recommend. 6. You may not actually need the regulator if you install a pump with sufficience flow rate at the right pressure. A carbed fuel pump set to 3.5 psi is perfect and you don't need the regulator. 7. Fuel filters. Have at least one to three in the system. One right before the pump, and one before the carbs, or one before each carb. I've been told you can't have clean enough fuel for carbs. Good luck!
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Qarl |
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04-30-2003, 07:20 PM
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Registered
Join Date: Aug 1999
Location: Denver, NC
Posts: 1,391
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I would recommend the pressure regulator with a guage "T" off the regulator so you know what the pressure is. Do not step down the pressure from the FI system via a regulator to work with carbs, you are just looking for problems if you take this route.
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05-01-2003, 07:48 AM
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Senior Member
Join Date: Feb 2000
Location: Lacey, WA. USA
Posts: 25,309
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Just a factoid: Carbs like just a few pounds of pressure (here 3-5 psi is mentioned). CIS fuel pumps make something like 100 psi of pressure!
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Man of Carbon Fiber (stronger than steel) Mocha 1978 911SC. "Coco" |
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05-01-2003, 08:10 AM
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Seldom Seen Member
Join Date: Jan 2003
Location: California
Posts: 3,584
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Al,
On my '73 carb conversion (done by PMO), the fuel pump is located in front of and inboard to the rear driver's-side wheel, screwed to the undercarriage.
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Why do things that happen to white trash always happen to me? Got nachos? |
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05-01-2003, 08:16 AM
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