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Join Date: Jul 2006
Posts: 15
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Need CIS Bleeding Advice - Please
From what I have read to bleed the CIS fuel injection system:
1. turn on the ignition 2. lift the air flow sensor in the air box Does the relay need to be jumpered when performing this procedure? When the air flow sensor is lifted, fuel cannot be heard. What could be the cause of this? Thanks |
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02-03-2008, 11:31 AM
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Join Date: Feb 2002
Location: Chalfont Pa
Posts: 1,548
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yes you have to jump at the round relay. I think procedure is in the bently if you have it.
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02-03-2008, 11:34 AM
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Posts: 15
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Thanks!
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02-11-2008, 05:12 PM
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Join Date: Dec 1999
Location: Richmond, VA USA
Posts: 1,058
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pchinen: you got it right -- you do NOT have to jumper the relay to do what you want to do.
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02-12-2008, 02:07 AM
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Join Date: Aug 2007
Location: Auburn Hills, MI
Posts: 122
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Just for my information: why do you perform a fuel bleeding? Do you simply unplug the injectors and let the fuel goes out?
Thank you. Quote:
__________________
Red 911 SC euro 78 - 964 cams, Carrera tensionners, new steel head studs, SSI & dansk 2 in 1 |
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02-12-2008, 03:57 AM
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When you change the filter or accumulator you need to bleed the line. I have always done this by turning on the key (not cranking just on), taking out the air filter, and lifting the air flow sensor in the top of the air box.
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Tom Hutchinson 80 Targa / 81 Coupe / 71 Targa (in Porsche heaven) My Garage Build: https://youtu.be/H0n_NwEQVbs "If one does not fail at times, then one has not challenged himself." Ferdinand Porsche |
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02-12-2008, 06:33 AM
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Join Date: Jul 2006
Location: Whitsundays, Qld, Australia
Posts: 630
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You should be able to hear the injectors 'sing' as they bleed.
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Boilermaker......another young man in an old man's body. Col. 3-'74 911 targa. |
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02-12-2008, 10:12 PM
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Join Date: Jul 2006
Posts: 15
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Thanks everyone for your advice. On my 1974 911 the injectors only sing while bleeding if the relay is jumpered. If the relay is not jumpered, there is no fuel from the injectors. Is this functioning as normal or is my problem more electrical related?
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02-13-2008, 09:41 AM
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Fuel Pump Relay Wiring....
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pchinen, '74 & '75 (911) US models wiring diagrams do not show any fuel pump relay. The fuel pumps ('74 & '75) will run when the ignition switch is turned to ON position. FP relays application started from 1976 to '83SC. I'm interested to know why you supposedly have a FP relay when the car is a '74 model. Are you sure your car have a FP relay? Keep us posted. Thanks. Tony |
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02-13-2008, 11:53 AM
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Dont over blled it or it will flood and potentially hydrolock. Only do it for a few seconds
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82 SC , 72 914 |
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02-13-2008, 03:02 PM
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Porsche
Porsche
1972 porsche 914
