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Join Date: Oct 2004
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Question Checking the fuel pump....?......

Did I do this right?
Yesterday, prior knowing about the alarm control mod from our friend AFJuvat (thanks), I broke out the Haynes manual to check for fuel to the fuel rail. First, I depressurized the system. Then, I unscrewed the end nut at the end of the fuel rail. A few drops of fuel came out. Had a friend turn over the engine and only a few more drops trickled out the end. I was expecting more. Car still isn't starting up. Haynes don't tell you everything either. Is the fuel pump bad? The fuel filter clogged? Or both? Is there another way to confirm a bad fuel pump before spending lot of $$$$?
Oh......yes, I already changed the DME relay with a new one, still no start.

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Tact57

late 85 944
95 BMW 325 is
Old 12-19-2005, 04:28 AM
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if you apply 12v to the pump and it doesnt run its bad.
If it does check all electrical to the pump.
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83 944....bye bye
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74 914...hasta LA Vista baby
87 924s....don't let the door hit ya
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Old 12-19-2005, 05:42 AM
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to me the easiest way to tell if the pump was running was to put the key in the on position and go to the rear of the car and listen for it. if it isnt running pull out a multi-meter and see if its getting juice
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Special Edition 924S 1988 <- SOLD!

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Old 12-19-2005, 06:46 AM
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Thanks, guys. I'll do just that.
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Tact57

late 85 944
95 BMW 325 is
Old 12-19-2005, 07:41 AM
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If you can't hear it running with the key on and you decide to try connecting it directly to the battery, connect the wires at the pump first and then connect those to the battery. If you do it the other way, you're likely to get a spark... right below the gas tank.
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1983 944 - Sable Brown Metallic / Saratoga / LSD : IceShark Light Kit
Old 12-19-2005, 07:58 AM
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With the key only in the "on" position, the pump will not run. It only runs in the "start" position and after the car starts. This is a safety to prevent fuel spillage in case of an accident where the ignition is on but engine is not running. Some other manufacturers use a different system that has a "g-switch_ (impact shuts off the pump and has to be manually reset)
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Old 12-19-2005, 08:18 AM
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I hooked 12V directly to the pump and it works. Its not the pump.
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Tact57

late 85 944
95 BMW 325 is
Old 12-19-2005, 09:25 AM
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DME relay?

You could try pulling it and jumpering the proper pins (see clarks-garage.com, I think the pin numbers and test procedure are in there ). Might tell you more about what's good. Easy to hear things working (pump, FPR) with the engine off.
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Old 12-19-2005, 10:13 AM
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It's running!!!!
AFJuvat suggested it was the alarm control module. I went ahead and bypassed it and waalaa. Thanks for everyone suggestion.
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Tact57

late 85 944
95 BMW 325 is
Old 12-19-2005, 10:31 AM
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Good call! BTW how do you bypass the module? Its the factory alarm with the arming key behind the drivers door right?
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83 944....bye bye
85.5 euro spec 944, 5sp (she's gone....
74 914...hasta LA Vista baby
87 924s....don't let the door hit ya
68 912.......see ya!
Old 12-19-2005, 02:20 PM
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The stock alarm system is a joke. And the fuel pump does run when the key is in the run position before starting, but not long enough to walk around the car. Its only to prime the system for start up.
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Old 12-19-2005, 03:06 PM
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Check the wiring diagram. Ain't the case. In the "start" position it runs.

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Old 12-19-2005, 04:19 PM
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