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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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CIS fuel filter. how often do you change it
the title says it all.
i have at least 30k miles on my filter. i checked my tank not long ago and it was very clean. what symptoms would you expect from a dirty filter? high RPM bad performance? bad starting? or just bad all around performance i have another one ready to go on, just curious, actually a slow day at work and looking for something to talk about.
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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10-27-2009, 04:13 AM
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Almost Banned Once
Join Date: Feb 2009
Location: Adelaide South Australia
Posts: 38,393
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I change mine bi annually and I drive my car about 10,000kms a year.
I know that's way to often but my 911 is one of the few luxuries I allow in my life. I've never had any issues with my fuel system so I can't comment on the symptoms of a dirty filter. What does the service manual say? As an example according to the Bentley, my VW Golf VR6 filter should be changed every 50,000kms. (This car also gets a new filter bi annually) Hope that helps.
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10-27-2009, 04:47 AM
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grateful user
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i have a 75, and i like to change it at least once a year, but i only drive it around 5-6 k a year. If your 77 is like my 75 the pump is in the rear, and there is enough room to put a filter in front of the pump. Gives me peace of mind. Napa has a short clear plastic one with 2 10 mm fittings, works great, very easy to change.
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fully disassembled, blasted, customized and restored 75 targa with factory hard top, 993 style turbo ft fenders, steel flares, C2 bumpers and rockers, 82 3.0 sc 9.5/1 engine with PMS flywheel, 964 cams, flowed heads, ssi's short geared 915 w/lsd, polybronze, bilstein,working lambda, modified and highly tuned cis, tensioners, pop valve, backdated exhaust and heater, 2300 lbs. no bolt left untouched. 1970 911E. Nice car but needs a re-do. |
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10-27-2009, 04:51 AM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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pump is up front. i guess i am long over due
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86 930 94kmiles [_ _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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10-27-2009, 04:55 AM
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Registered
Join Date: Feb 2001
Location: South of the Mason-Dixon Line
Posts: 3,722
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CIS needs clean fuel and a filter is a cheap insurance! I change mine once a year and I might drive up to 5K if I am lucky!
Bob 73.5T |
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10-27-2009, 05:05 AM
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Somatic Negative Optimist
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Depends somewhat on size.
SC's have big and small depending on what year. I like the bigger one and configured the lines and fittings for it. Mark it with date and Mileage for referrence. 
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD! 1995 seafoam-green 993 C2, LSD, Sport seats.  Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ". 
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10-27-2009, 10:05 AM
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Registered
Join Date: Sep 2005
Location: Palos Verdes, CA
Posts: 517
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unless its a stock 74
Try and find those original OEM fuel filters for a 73 1/2 and 74 CIS . . . $$$$$$ if you can find them.
Fortunately my car came with 3 extra filters per original owner records, over 22K miles and still flowing fine.
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M-74 |
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10-27-2009, 06:06 PM
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75 Porsche 911
bike
1970 porsche E
ME 262 (SOLD)
Colibri
Gas Mizer
Mileage King
Dog Bus
