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Discussion Starter · #1 ·
Dear all,
I have an E39 530 DSE with a starting prob and its become very expensive now having had a new crank sensor ,new cam sensor and a new fuel pump the fuel pump being the one under the near side seat, the car will not start sometimes no matter what you try , go back a few hours later and there is a good chance it will run like there was nothing wrong.
the last thing to be replaced was the fuel pump and all seemed well for 2 weeks , got in the car this morning and once again the same damn problem is back ,there was a light frost this morning and I noted that no pre heater warning showed up, although it very rarely does, is this a clue !.when the engin is running it is perfect with no miss fires or lack of power.
I spoke to a BMW technician and was told that even without the pre heater circuit running the car should start with a little effort . is this true ! could it be a fuel pump relay , if so where will I find it,or could it be the lift pump in the tank.Any help would be so appreciated. Chris
 

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When it does eventually start, do you get large quantities of smaoke out of the exhaust? Could be a low pressure problem on the HP side. Injectors leaking off pressure maybe? Just ideas at the mo, will have a think!
 

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Fuel pump relays are a favourite failure on 530d/535d's (changed about 3 on customer cars now) - they are only about £12-£15 from the dealer so well worth swapping out. As far as i remember they are located either in the boot on the right hand side or in the front fuse box behind the glovebox depending on year/model.
 
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I would change the fuel pump relay as it's cheap, it's a green relay and should be behind the glovebox, they do play up on them
 

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Discussion Starter · #6 ·
thanks for your reply,
dont think its the injectors as when it is running its a dream , no smoke unless you really boot it.
one thing that is odd is that it had a new pump two weeks ago and all seemed well till today , what i did do was take the supply tube off the fuel filter turned on the ignition and no fuel is pumped up at all, anyway to finish the story for today , i turned on the cars non engine heater for about half hour to warm the car up a little and tried again and it started , may not have been due to warming the car up at all but it started again
I then drove it to work and it started again when I left with no problem at all , but the worry is that i know it will happen again but you just dont know when , could it be the pump relay I wonder , what do you think .
 

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Discussion Starter · #7 ·
thanks very much.
I will try the relay next , there are two on the right hand side in the boot .
is one for the pre supply pump and the other for the tank lift pump.
I just wish you could buy a service manual for the car , it an E39 530DSE year 2001. thanks again
 

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thanks very much.
I will try the relay next , there are two on the right hand side in the boot .
is one for the pre supply pump and the other for the tank lift pump.
I just wish you could buy a service manual for the car , it an E39 530DSE year 2001. thanks again
I'm not sure and would need to check on Autodata when at work, you could always remove one at a time and see which pump doesn't work
 

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Discussion Starter · #9 ·
changed he relays in the boot !

Hi again,
ok I changed the relays in the boot , two light green ones, one thing that was odd was that I removed the old pair then tried to start the engine with them out and the engin started, very odd ! or can the run with them removed provided fuel is present in the system at the engine end, or am I talking rubbish ha ! perhaps those two relays are for something else.I am confused now.
I am in France with the car and was pleased at how cheap the relays were at just 10 euro each, less than twenty pounds for the two,I opened the old ones and the contacts on one were in a real state , very badly burnt.
the car is a 530dse 2001/2002 manual e39 .reg no is AR51KKE would be a great help to know that the ones ive changed are the right relays . thank so much for your help, chris
 

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Discussion Starter · #10 ·
Hi again,
ok I changed the relays in the boot , two light green ones, one thing that was odd was that I removed the old pair then tried to start the engine with them out and the engin started, very odd ! or can the run with them removed provided fuel is present in the system at the engine end, or am I talking rubbish ha ! perhaps those two relays are for something else.I am confused now.
I am in France with the car and was pleased at how cheap the relays were at just 10 euro each, less than twenty pounds for the two,I opened the old ones and the contacts on one were in a real state , very badly burnt.
the car is a 530dse 2001/2002 manual e39 .reg no is AR51KKE would be a great help to know that the ones ive changed are the right relays . thank so much for your help, chris
 
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