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Certified Pre-Owned
Join Date: Aug 2002
Location: Nanny State
Posts: 3,132
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Carrera fuel pump question
Here goes:
When you first twist the key in the morning to "run" (like just before you're gonna crank the engine), should you hear the fuel pump run? Also, which relay in the fuse box is the fuel pump relay? I lost my fuse box cover... -BG
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'84 Carrera Coupe |
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05-15-2003, 08:31 AM
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GFCC
Join Date: Apr 2002
Location: Phoenix, AZ
Posts: 1,785
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Mine doesn't. The fuel pump fuse is #6, counting from the rear of the car to the front. What year is your car?
Just checked all year Carreras (84-89) are in the same location.
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Jeff 1976 911 Coupe w/ Euro 3.0 - Sold 1987 Carrera Coupe - Sold 1999 Carrera Cabriolet - Current Last edited by Jeff; 05-15-2003 at 08:42 AM.. |
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05-15-2003, 08:39 AM
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Irrationally exuberant
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When I first turn on the key I usually hear the pump.
-Chris
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'80 911 Nogaro blue Phoenix! '07 BMW 328i 245K miles! http://members.rennlist.org/messinwith911s/ |
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05-15-2003, 09:03 AM
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Certified Pre-Owned
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Location: Nanny State
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My Carrera is an 84. I had the motor out to do the clutch and a bunch of other things and replaced all my injectors. The car has been idle for 4 months, with Stabil in the gas tank. It started really hard for the first time yesterday, which I could understand as there was no gas back in the fuel rails (after changing injectors and replating the rails.) The car finally fired and ran o.k., but I shut it off after 5 minutes to do something else. Came back 10 later, cranked and cranked and cranked and finally fired, popping, pooping, etc... Step on the gas and real muddy feeling, engine didn't want to increase rpm. Finally died. No restart. Thinking fuel pump dead as a fluke, or air vane box flapper is stuck. All other sensors check out, except I'm not sure how to check crank ref. sensor or timing sens. New plugs, dist cap, rotor, wires good, new fuel filter 300 mi. ago, thinking pump...tips on how to check appreciated.
-BG
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'84 Carrera Coupe |
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05-15-2003, 09:20 AM
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BG maybe it,s a dirty filter in the gastank itself. Is it maybe on reserve fuel ? try and fill another 10 liters of gas in it and try again. I had exact same problem and it was a dirty filter from the reserve gastank.
Ed
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87 Carrera Backdate |
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05-15-2003, 09:28 AM
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Location: McLean, VA
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BG<
Its a simple test to confirm fuel pump dead or alive. - Ignition off for these tests - Connect a jumper wire to Fuse 16 in the truck fuse panel - Touch the jumper to Fuse 17 in the panel. The fuel pump should run. - remove the DME relay - jumper pins 30 and 87b - pump should run Ignition On - DME relay pin 86 should have battery voltage - DME relay pin 30 should have battery voltage - DME relay pin 85 should have ground If all these tests are good, the pump and pump control relays are good.
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Tony K '89 944T 944 SuperCup Champ 2004 & 2005 '85 Carrera - Sold [sob] TrackVision 944Cup The 999 Site |
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05-15-2003, 09:35 AM
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Certified Pre-Owned
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Location: Nanny State
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Thanks. I'll give the test a whirl. I have replaced the filter in the tank itself when I reconditioned the tank exterior last fall. I have almost a full tank of gas...
Quote:
Thanks- BG
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'84 Carrera Coupe Last edited by BGCarrera32; 05-15-2003 at 09:59 AM.. |
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05-15-2003, 09:57 AM
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Irrationally exuberant
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The DME "relay" is really 2 relays in one; fuel pump and DME relay. It's under the drivers seat.
-Chris
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'80 911 Nogaro blue Phoenix! '07 BMW 328i 245K miles! http://members.rennlist.org/messinwith911s/ |
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05-15-2003, 10:05 AM
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Certified Pre-Owned
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You guys are awesome. Thanks again...hopefully I'll get this nipped in the butt tonight...
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'84 Carrera Coupe |
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05-15-2003, 10:18 AM
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Irrationally exuberant
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Quote:
 -Chris |
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05-15-2003, 11:11 AM
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GFCC
Join Date: Apr 2002
Location: Phoenix, AZ
Posts: 1,785
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BG,
Is it possible you connected the speed and reference sensor to the wrong terminals? They are marked with tape collars. DG= Speed sensor and BG= Reference sensor. Just a thought. To check these sensors, check the resistance between the sensor terminals. Counting pins from top to bottom... 1 and 2 = 960 ohms +/- 96 1 and 3 = > 100,000 ohms 2 and 3 = > 100,000 ohms
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Jeff 1976 911 Coupe w/ Euro 3.0 - Sold 1987 Carrera Coupe - Sold 1999 Carrera Cabriolet - Current |
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05-15-2003, 01:53 PM
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Location: Galivants Ferry, SC
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Chris:
Confused..??? Shouldn't there be a safety aspect that prevents the fuel pump from runningf when the ignition switch is "on" ...but the engine is not running ?? I believe the fuel pump shouldn't run unless rpm's are sensed....no? ---Wil Ferch
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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05-17-2003, 03:44 AM
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Will,
In the DME cars, the pump does not run until the key is turned to Start. The DME logic seems to be Start OR Revs = Pump Enabled.
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Tony K '89 944T 944 SuperCup Champ 2004 & 2005 '85 Carrera - Sold [sob] TrackVision 944Cup The 999 Site |
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05-17-2003, 03:48 PM
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APKhaos:
OK...so when against the spring loaded "start" positon, ... the fuel pump runs. So how does Chris B hear the pump? When I start, I hear a lot of engine "turning" noises...or an immediate firing up of the engine. --Wil Ferch
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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05-20-2003, 12:23 PM
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Certified Pre-Owned
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Location: Nanny State
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When I hot wire my fuel pump it runs. When my key goes to run, I hear nothing. When my key goes to start, the pump runs.
Now if I could just get spark... 
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'84 Carrera Coupe |
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05-20-2003, 12:46 PM
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Irrationally exuberant
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I just went and checked and you're right, the fuel pump doesn't run when I turn the key. I wonder what I was thinking...
-Chris
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'80 911 Nogaro blue Phoenix! '07 BMW 328i 245K miles! http://members.rennlist.org/messinwith911s/ |
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05-20-2003, 03:26 PM
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Chris :
That's OK..you're just *irrationally exuberant* ...  --Wil Ferch
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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05-21-2003, 12:43 PM
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The Blue Pheonix
