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CIS and Fuel Distributing
guys i change the fuel pump on my 1974-911s cause it was bad, now when i check the lines from the jets, no fuel...but i'm getting fuel and the right PSI on the main line going to the fuel distributor, fuel and PSI from the FA is fine, could this mean that the F.D could be going bad, but before i was getting fuel lines from the jets end....?
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04-14-2009, 01:26 PM
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Join Date: Oct 2005
Location: Capistrano Beach, Ca.
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Did you lift the plate in the plenum to trigger the injectors and bleed the system? If not, do that. Caution, do not hold the plate up for more than 5-6 seconds--just enough to hear the injectors "squeal."
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L.J. Recovering Porsche-holic Gave up trying to stay clean Stabilized on a Pelican I.V. drip |
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04-14-2009, 01:36 PM
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Location: Santa Barbara, CA
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Fuel distributors don't just fail all at once in my experience, they deteriorate. I'd look elsewhere.
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jhtaylor santa barbara 74 911 coupe. 2.7 motor by Schneider Auto Santa Barbara. Case blueprinted, shuffle-pinned, boat-tailed by Competition Engineering. Elgin mod-S cams. J&E 9.5's. PMO's. 73 Targa (gone but not forgotten) |
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04-14-2009, 01:37 PM
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Thanks guys....im going to try lifting the plate and bleeding the system....what will happen if i hold the plate up too long Ossiblue?
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04-14-2009, 02:05 PM
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Quote:
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L.J. Recovering Porsche-holic Gave up trying to stay clean Stabilized on a Pelican I.V. drip Last edited by ossiblue; 04-14-2009 at 02:48 PM.. |
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04-14-2009, 02:18 PM
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Thank you Sir..i got it started......yahoo........now....what if it doesnt start in the morning....what can cause that....FA or WUR...?
Last edited by Mia911; 04-14-2009 at 06:11 PM.. |
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04-14-2009, 06:03 PM
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guys, i try starting it this morning and it wouldnt start, so i prime the system again and played with the gas pedal...and BAM it started....does this mean the FA is not keeping the fuel in the system.....thanks again guys....
Last edited by Mia911; 04-15-2009 at 01:10 PM.. |
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04-15-2009, 08:23 AM
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Glad you got it going.
Your current problem could have several causes. One word of caution, with the CIS, you don't want to pump the gas on a no-start--that's the quickest way to blow out your air-box with a backfire through the intake. Now's the time to run the basic pressure checks of your fuel system--tons of threads on this but basically you need a fuel gauge designed to test the CIS. Test system pressure, cold control pressure, warm control pressure, and residual pressure. If this sounds like "Greek" to you, it will be clear with some basic reading up. If your warm up regulator is out of specs, you will get a no/hard start, for example. If the residual pressure doesn't hold, you will get similar problems. You could chase your tail for a long time. Be sure all valves are adjusted, ignition is in specs and test your fuel pressures as a start to narrow down the problem areas. Keep us up to date on your progress and ask away on any questions. One more thing: Your new fuel pump, is it OEM and if not, does it have a check valve that is working?
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L.J. Recovering Porsche-holic Gave up trying to stay clean Stabilized on a Pelican I.V. drip Last edited by ossiblue; 04-15-2009 at 10:09 AM.. |
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04-15-2009, 10:06 AM
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yes its a OEM fuel pump, same as i took off, i already got the guages borrowed from a friend who showed me what to look for and what to test, he also mention the same things as the WUR is out of wack and how to test the FA, he also loan me and extra WUR and FA to see if that solve the problem, and if its either i just buy one and replace his......
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04-15-2009, 11:34 AM
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Quote:
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L.J. Recovering Porsche-holic Gave up trying to stay clean Stabilized on a Pelican I.V. drip |
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04-15-2009, 12:55 PM
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you guys been a great help also, before i didnt have a clue, when you mention priming the FD i call him and ask if he knew how to do it, i took the car to his house and in 15 minutes it started right up....you hit the nail right on its head, he also explained to me how the system work, i told him i only knew a little especially on what i read here on the forum, now i am actually getting first hand experience on trouble shooting the system...thanks again for your professional and accurate advised... keep up the great work....
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04-15-2009, 01:08 PM
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D Gastapo
