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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.

Old 07-06-2006, 07:19 AM
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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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Old 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.
Old 07-06-2006, 08:10 AM
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Sounds like its Possessed
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Old 07-06-2006, 08:58 AM
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Quote:
Originally posted by Britwrench
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?

SO! Moving in on MY territory eh bucko!
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When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
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Old 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
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When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
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Old 07-06-2006, 09:21 AM
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Time for some sharpshooting!
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Old 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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Old 07-06-2006, 09:37 AM
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I haven't found any evidence of another fuel pump anywhere.
Old 07-06-2006, 11:24 AM
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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.
Old 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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Old 07-06-2006, 03:21 PM
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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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Old 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.
Old 07-06-2006, 03:54 PM
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stuck open injectors?
Old 07-06-2006, 05:17 PM
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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?
Old 07-06-2006, 05:20 PM
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Quote:
Originally posted by SoCal Driver
(insert theme from Twilight Zone)

The question is: Where is the real fuel pump.

I'm going with Socal on this one.
If it runs there is another fuel pump somewhere.
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Old 07-06-2006, 05:27 PM
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Quote:
Originally posted by WaA420
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?

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.


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Old 07-06-2006, 05:29 PM
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77 924

WaA420, did you check you email/ pm?
Old 07-06-2006, 05:31 PM
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Quote:
Originally posted by Wolf1
And FWIW. option code M666 was only available on pre-1980 924's and 931's.
Except through the Special Wishes department.
Old 07-06-2006, 06:00 PM
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That's Special Witches for code M666.

Old 07-06-2006, 06:27 PM
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