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911 sc porsche 1981
My 1981 911sc porsche will start but dies in 2 seconds i changed the fuel filter spark plugs and wires Im getting gas all the way to the fuel injection pump but none is coming out. my car has a 3.0 fuel injection motor i need help thank very much.
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12-04-2014, 07:26 AM
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Join Date: Jan 2007
Posts: 2,370
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Fuel pump on its way out? Have you tested the pressure in the line coming up?
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12-04-2014, 07:35 AM
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Steve... you're probably looking for a quick answer... which unfortunately I don't have for you. What I do have, and much credit to Tim for putting a universe of CIS fuel injection info together for '78 - '83 911's, you can start looking at his thread to get a handle on your challenge...
CIS Troubleshooting for Dummies
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Karl ~~~ Current: '80 Silver Targa w /'85 3.2. 964 cams, SSI, Dansk 2 in 1 out muf, custom fuel feed with spin on filter Prior: '77 Copper 924. '73 Black 914. '74 White Carrera. '79 Silver, Black, Anthracite 930s. |
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12-04-2014, 07:59 AM
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Join Date: Jun 2000
Location: bottom left corner of the world
Posts: 22,732
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I also think fuel pump. It could be lack of power getting to it. This was what happened to my SC. It turned out to be a loose wire in the fuse box.
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12-04-2014, 08:30 AM
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Join Date: Feb 2006
Location: Ontario Canada
Posts: 2,947
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hang a meter of the fuel pump.
see if its getting power .
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1976 Yamaha XS360 ( Beats Walkin') 1978 911 SC Targa ( Yamaha Support Vehicle ) 2006 Audi A4 2.0T (Porsche Support Vehicle ) 2014 Audi A4 2.0T Technik (Audi Support Vehicle) |
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12-04-2014, 09:05 AM
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Make sure your oil fill cap is on firmly.
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Brad Inventor of SNAPGAP - The Valve Adjustment Solution Patented in U.S. and Europe. Go to SNAPGAP.US or PM me. https://www.pelicanparts.com/More_Info/SNPVAK11146.htm?pn=SNP-VAK11146 |
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12-04-2014, 09:33 AM
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Registered
Join Date: Feb 2006
Location: Ontario Canada
Posts: 2,947
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..kay heres the thing ....
when i disconnect my fuel relay during oil changes . i always turn over the engine with the starter to pump the oil pressure without ignition . The car NEVER starts for 2 seconds then dies. it barely even fires and the fuel pump isnt running . lets face it even the cold start injector needs fuel pressure to work ... just food for tought ..
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1976 Yamaha XS360 ( Beats Walkin') 1978 911 SC Targa ( Yamaha Support Vehicle ) 2006 Audi A4 2.0T (Porsche Support Vehicle ) 2014 Audi A4 2.0T Technik (Audi Support Vehicle) |
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12-04-2014, 10:10 AM
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Join Date: Apr 2003
Location: Maitland, Florida
Posts: 892
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You have a switch in the fuel metering unit. It uses a plastic sleeve to isolate itself from the bolt that retains it.
If the insulation wears to allow the screw to make contact with the housing, it shuts the fuel pump off when you release the key.
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82 911SC Targa (05 Boxster S ) gone, but not forgotten 87 Suzuki GSXR-1100 1953 MG TD Mk II |
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12-04-2014, 10:48 AM
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1981 91 sc porsche fuel problem
Thanks for the inputs guys now i now where to start looking does anybody where to check the fuel pressure and how much does it suppose to have
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12-04-2014, 11:48 AM
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Heck, I’m only 5 not 71!
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your going to need a CIS fuel pressure gauge set to tie into the fuel lines at the Warm up regulator (this would be the easiest place to get to). The fuel pump and accumulator should be providing about 5 bar (70 PSI) There are a multitude of threads on checking the pressures and it seems that harbor freight sells a pressure set with a multitude of adaptors. You will need to remove your red fuel pump relay and jumper between terminal 30 and I believe 87A. This will activate the pump with ignition on.
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Pat Henry Targa80 1980SC Targa (Mocha Brown) |
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12-05-2014, 12:59 PM
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The alarm system is also tied into the fuel pump. My alarm died - I removed the alarm box behind the HVAC blower (under the wiper motor) and added the jumper wire in the female connector. Cured my problem.
Just thinking, the engine wouldn't start period when I had the problem. Good luck.
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1982 911 SC Targa - Rosie....my Mistress. Rosewood Metallic on Dark Brown and Black. Long distance road warrior and canyon carver. A few mods - a little interior, some brakes, most suspension and all of the engine. |
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12-05-2014, 04:46 PM
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Thank you guys let you know what I find out . thanks again
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12-06-2014, 01:31 PM
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1974 Carrera
1979 930
1980 SC Targa
Rosie
