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944 runs with fuel pump disconnected. How is that possible?
1983 944 runs with fuel pump disconnected. Cannot understand what process is transferring fuel from tank to engine. Engine will not crank with fuel pump connected. After engine warms up fuel pump can be connected. Fuel consumption is extremely excessive. Fuel pump has been tested and is good.
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07-06-2006, 07:19 AM
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Join Date: Aug 2001
Location: Brighton UK since 11/2012
Posts: 3,170
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Fuel injected cars cannot run with the pump disconnected and not producing pressure. Sounds to me like the fuel pressure regulator has failed and allowing excessive pressure, making the engine run too rich.
Try checking the fuel pressure with a gauge. If the regulator has failed then also replace the damper too. Before SoCal says anything: Have you replaced the timing and balance shaft belts, fuel pump relay and are up to date with the maintenance?
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From November 2012; Precision Porsche Specialist Sussex UK, +44 (0)1825-721-205 2001-2012 Gerber Motorsport Inc. 206-352-6911 07.15.06 1996 Ducati 900SP. Suprisingly enough, it's red 08.16.09 1999 Kawasaki ZRX1100. Green. |
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07-06-2006, 07:59 AM
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The fuel pressure regulator and the damper are new Bosch OEM replaced a week ago.
Trust me the car runs without the fuel pump connected. I have totally disconnected the wires at the pump. It is not running but the car will crank and run every time as long as the fuel pump is not connected. |
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07-06-2006, 08:10 AM
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Sounds like its Possessed
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86 Red 944(sold) 85.5 Red 944(sold) |
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07-06-2006, 08:58 AM
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Quote:
SO! Moving in on MY territory eh bucko!
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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07-06-2006, 09:16 AM
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(insert theme from Twilight Zone)
The question is: Where is the real fuel pump.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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07-06-2006, 09:21 AM
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Certified Rennwerker
Join Date: Oct 2002
Location: Kansas
Posts: 1,906
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Time for some sharpshooting!
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PCA " I've been everywhere, done everything......just can't remember any of it!" 
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07-06-2006, 09:35 AM
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Did the PO install an aftermarket fuel pump somewhere you dont know about? Just a thought.
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86 Red 944(sold) 85.5 Red 944(sold) |
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07-06-2006, 09:37 AM
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I haven't found any evidence of another fuel pump anywhere.
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07-06-2006, 11:24 AM
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Location: Tacoma, WA
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Look at the bright side, atleast you don't have to replace an expensive fuel pump. Anything else un hooked? Check to see if the timing belt is still there and the water pump. If we could get these cars to run with out these think of all the hassle this would save.
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07-06-2006, 03:13 PM
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http://www.network54.com/Forum/426130/message/1129250881
If your car runs without a fuel pump, Ferry Porsche is going to have to visit your car and perform an exorcism. In the interim, better not look at it funny, nobody wants a 944 with a vindictive attitude!!! P
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1983 928S 5-speed, 1984 944, 1990 944S2 Cabriolet My other car is a Chris Craft Commander http://www.chriscraftcommander.com |
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07-06-2006, 03:21 PM
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Location: Edmonton, Alberta, Canada
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It runs without the fuel pump connected?
As in runs like &(*&*@ ....... or you can actually drive this thing?
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Alex - PCA Polar Region - Boxster Muncher 86' 944 Turbo - Megasquirt - 326 rwhp/340lbft @ 18 psi SOLD www.edmontonhomelife.com www.edmontonrealestate.ws |
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07-06-2006, 03:47 PM
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The car will drive down the road as long as you do not accelerate too quickly.
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07-06-2006, 03:54 PM
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Posts: 55
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stuck open injectors?
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07-06-2006, 05:17 PM
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Location: Tacoma, WA
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Turns out this could be totally possible. After doing some indepth research I was able to turn up a rare option code M666. This is the key component omission option. I'm going to check a couple cars that I have around that are missing some key parts. from what I've read this option isn't specific to any one part and may include but isn't limited too trans, cylinder head, clutch disk, oil pan, wheels, and fuel tank. Who would have thunk?
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07-06-2006, 05:20 PM
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Location: Idaho Falls, ID
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Quote:
I'm going with Socal on this one. If it runs there is another fuel pump somewhere.
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75 914 - Undecided. 80 931 - Gone, but not forgotten. 72 914 - old toy- sold. And a whole bunch of German scrap metal shaped like 924's. Old enough to know better, and stupid enough to do it anyway! |
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07-06-2006, 05:27 PM
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Quote:
And FWIW. option code M666 was only available on pre-1980 924's and 931's.
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75 914 - Undecided. 80 931 - Gone, but not forgotten. 72 914 - old toy- sold. And a whole bunch of German scrap metal shaped like 924's. Old enough to know better, and stupid enough to do it anyway! |
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07-06-2006, 05:29 PM
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77 924
WaA420, did you check you email/ pm?
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07-06-2006, 05:31 PM
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Location: Tacoma, WA
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Quote:
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07-06-2006, 06:00 PM
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Non Compos Mentis
Join Date: May 2001
Location: Off the grid- Almost
Posts: 10,634
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That's Special Witches for code M666.
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07-06-2006, 06:27 PM
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1983 Porsche 944 2.5 liter
