[Roketarm]

Hey all, brand new here. My 94 530i was running fine this morning, then this afternoon I go to start, and it takes forever for it to start. After pumping the gas several times, it starts then runs for a couple of minutes then shuts off. I started it again....runs for a couple of minutes, then shuts off. I started it for a third time, start to drive it...starts bucking, and shuts off. Now it wont start at all....Could this be the positioning sensor, or the fuel pump? I need a starting place as I need to fix this problem...asap! Any help would be greatly appreciated....

 

[witeshark]

Dirt in the fuel (filter), fuel pump may be going bad. There are quite a few possibilities.

 

[Roketarm]

How do I check to see if the fuel pump is working? Where on the 530i is the fuel pump located?

 

[witeshark]

Try looking at realoem.com - I think it's in the fuel tank.

 

[Roketarm]

Thanks...

 

[Roketarm]

Where is the crankshaft positioning sensor located for the 94 530i?

 

[Roketarm]

I just checked the fuel lines, and Im getting zero fuel coming into the engine. I wanted to check the fuel switch relay....where is it located?

 

[marti5]

Passenger side, not too sure maybe in engine compartment or open glove box and look up.

Also check fuseable link under the rear seat............maybe a good idea to direct feed( off the batt) the pump this will let you know if the pump is good.

 

[Roketarm]

what does the fuseable link look like??

 

[marti5]

Pull the rear seat out and you will see it its basically a fuse in the wiring.

 

[Roketarm]

Pulled the rear seat....found a big fuse that connects to the battery, but there is NO fuse in it....what does that mean?? What amp size fuse fits in there?

 

[marti5]

Hmmmm..... Very strange as there should be a fuse in there, as for ampage, sorry I dont know, does it not say on the holder, if not go for a 10amp to start if that blows go up....

 

[Roketarm]

Thanks, will that have ANY affect on my engine starting, or fuel pump?

 

[marti5]

Well as said there should be a fuse there already,maybe someone has messed about with this before and bypassed the it some how, put one in and see what occurs, it can only blow.

 

[Roketarm]

Took the fuel pump out today, and did a direct connect....and got nada...not working at all. I ordered a new one today ($310) and will be putting it in this afternoon....

 

[Roketarm]

Found out the fuel pump was working fine, and that Im not getting ANY power back to the fuel pump....nada. I've had 10 people give me 10 different answers....can anyone give me a starting point???

 

[Roketarm]

Turns out my fuel pump is fine, but I'm getting NO power back to the pump. Does anyone have a starting point as to what this could be, and what I should do next?? Any help is greatly appreciated

 

[witeshark]

Could it be a simple broken wire?

 

[jimoreno]

The fuel pump relay is inside the DME box and there should be a sticker in the box identifying them. Check first the fuel pump relay (is the white one in the box). Per the Bentley manual: "To run the fuel pump, remove the relay and connect the socket for terminal 30 the the socket for terminal 87 with a fused wire" and if this doesn't work check the main relay (it is the white one).
DME powers the main relay which in turns powers the fuel pump relay as long as the engine is cranking or running. Oh, and fuse 23 in the box is for the fuel pump, you checked that one too, right? ;-)

 

[Roketarm]

UPDATE: I had my car towed to a local BMW mechanic, and it turned out to be my sending unit. Apparently the fuel pump was going bad, and drawing 15 amps instead of the normal 6 and ended up frying the wiring inside the sending unit, and for some reason it didnt blow the fuse to the pump, which explains whay I had zero power to the pump. He replaced the fuel pump, and sending unit, and she's running lean and mean once again. Thanks everyone for all of your help...