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Registered
Join Date: Jul 2006
Location: Whitsundays, Qld, Australia
Posts: 630
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CIS fuel pump questions
G'day all.
I have a 74 2.7 CIS. I'me trying to sort out all of the problems from the previous owner, plus the new gremlins which have occured from the car sitting in storage for many years. Firstly, the fuel had turned to varnish. The fuel pump had packed it in, the fuel lines were blocked, the fuel tank was full of crap, e.c.t. I've fixed all of the above [thanks to our most gracious host & these forums] but the banjo fitting on the fuel pump had become clogged. The spring & ball valve were frozen solid, not allowing fuel to flow past them. I've removed the spring & ball, but now i have a new problem. I dont run the car regularly at this point, but when i want to start it, i have to jack up the car, remove the rear wheel, disconnect the fuel pump feed hose, install a high flow pump to draw fuel from the tank, prime the NEW oem pump, then put it back together. Disconnect the fuel line after the filter, prime the fuel system, refit fuel hose, hold up the lever in the air box then........ ready to start! This is every time i want to run the car! Even after it sitting overnight! I'me wondering if the main culprit is the banjo fitting,not holding fuel in the line & draining back to the tank, or should i look elsewhere? All help is appreciated. Cheers, Col.
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Boilermaker......another young man in an old man's body. Col. 3-'74 911 targa. |
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10-18-2007, 02:58 PM
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Registered
Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
Posts: 21,140
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if mine i'd clean fuel tank screen and move fuel pump foreward like other CIS cars.
also the tank will supply a natural head of fuel on the pump through a short hose among other issues.
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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10-18-2007, 10:20 PM
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Wer bremst verliert
Join Date: Jan 2005
Location: Toronto, Ontario
Posts: 4,767
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If you have a spare pump available to prime it, why not just use that one with a regulator?
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2007 911 Turbo - Not a toy 1985 911 Cab - Wife's toy 1982 911 3.2 Indiash Rot Track Supercharged track toy 1978 911 3.0 Lichtbau toy "Gretchen" 1971 911 Targa S backroad toy |
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10-19-2007, 12:01 AM
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Designer King
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 5,499
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If the fuel had turned to varnish, it's possible it also gummed up the fuel distributor and the WUR. The fuel injectors may have also been compromised.
Also try this: next time you try to start it, take off the air flter and lift the sensor plate. that may prime the system sufficiently. Have you had the tank cleaned? Changed the fuel filter?
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Paul Yellow 77 Sunroof Coupe/cork interior; 3.2L SS '80 engine/10.3:1/No O2; Carrera Tensioners; 11 Blade Fan; Turbo tie rods; Bilstein B6; 28 tube Cooler; SSI, Dansk; MSD/Blaster; 16x7" Fuchs/205/50 Firestone Firehawk Indy 500s; PCA/UCR, MID9 Never leave well enough alone |
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10-19-2007, 05:51 AM
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Registered
Join Date: Jul 2006
Location: Whitsundays, Qld, Australia
Posts: 630
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I've removed the tank & had it cleaned. I blew all the fuel lines out with air. Replaced the fuel filter.
When i get fuel supply, the fuel flows freely & looks clean. The spare pump i use to prime with will not fit in the original space. I've fitted a brand new OEM Bosche fuel pump.
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Boilermaker......another young man in an old man's body. Col. 3-'74 911 targa. |
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10-19-2007, 03:45 PM
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Residual Fuel Pressure
Cool,
Having installed an OEM fuel pump is good but it has to have a check valve. Not until you get a good residual pressure in your fuel delivery system, starting the engine will always be a problem. Let's us know how's the car is performing. Tony PS: Cool's father died the other day. May he rest in peace. |
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10-19-2007, 04:51 PM
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Registered
Join Date: May 2004
Location: Lake Cle Elum - Eastern WA.
Posts: 8,417
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The check valve is design to make sure your fuel system keeps pressure. If it's bad, the pressure bleeds off and you have to crank for a long time to build it back up again. You could also have a bad WUR, this will cause the same symptoms.
I see you live in the WhitSudays.......I tried driving up the coast on my last trip to Australia, but gave it up at MacKay.......Still want to make it up there someday, heard great things about it. I have Queensland friends in Hervey Bay and Cooray if you know those little hamlets!!!!!!
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Bob S. 73.5 911T 1969 911T Coo' pay (one owner) 1960 Mercedes 190SL 1962 XKE Roadster (sold) - 13 motorcycles |
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10-19-2007, 05:46 PM
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Registered
Join Date: Jul 2006
Location: Whitsundays, Qld, Australia
Posts: 630
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Mackay is my home m8!
I use Whitsundays in my sig so you US fellas know roughly where i am! Mackay is the start of the Whitsunday group. I can understand why you didn't need to venture any further! SSSSHHH! Dont tell anyone how lovely it is here!!! Whoops! Tony, thankyou for your kind words. PM sent. I'me convinced the check valve is the culprit.
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Boilermaker......another young man in an old man's body. Col. 3-'74 911 targa. |
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10-20-2007, 03:59 AM
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Registered
Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
Posts: 21,140
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just some OT CIS info that 2.7Racer wrote. It's very good for reference imo.
1977 911 more fuel problems
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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10-20-2007, 11:36 AM
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Registered
Join Date: Feb 2005
Location: Huntsville, AL
Posts: 1,346
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coolngroovy,
In your original post, you said you removed the spring and ball from the banjo fitting, but I didn't read where you replaced it. This is the check valve. If you didn't replace it, this could be the root of your problem. I'm not sure this fuel pump had an internal check valve. These pumps like to pump only if they are full of fuel. They don't make good air pumps.
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Jim www.jimsbasementworkshop.com (CIS Primer for the 911) (73 911T (RS look) coupe) (Misc. 911 Parts for Sale) |
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10-21-2007, 06:17 PM
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