Fuel Pump Relay Diagnosis

PaulSidiro · 01-20-2019, 06:11 PM

Hi!

I’ve seemed to isolate my no start issue on the 2010 X5 3.0 to a faulty fuel pump relay, but in testing the relay all variables seem ok?

I get Clicking when energizing the relay between 85/86 terminals, resistance across same terminals is 95ohms. 30/87 terminals are open when de-energized and closed when energized.

I jumped the terminals on the relay connector and confirmed the fuel pump runs when energized. Then I checked the other points for DME voltage when cranking and get 9.0 volts or thereabouts. So that seems to be working.

Just wondering before buying the $50 relay from my dealer, whether it may be something else? 20amp fuel pump fuse #150 is fine.

Feedback is greatly appreciated.
Paul

rodnex · 01-31-2019, 01:24 PM

Hi,

had similar issue, car sometimes just didn't start...

Used the relay from my E39 (it got a couple of those for rear window heater etc) But it is actual just an universal relay with nice BMW logo on it, so you can buy a similar one for 5 bucks in any car parts shop.

PaulSidiro · 01-31-2019, 03:44 PM

Thanks!

Yes it was a very quick repair, the relay was the issue.
Gouged by my dealer $50 for the relay, but I needed it ASAP.

Found it online and at other private bmw shops for $22 or go to a motorcycle BMW dealer for $24. Pretty much a monopoly o BMW parts in my city.

Cheers!

01-20-2019, 06:11 PM	#1
PaulSidiro New Member 0 Rep 11 Posts Drives: 2010 X5 Join Date: Mar 2018 Location: PNW iTrader: (0)	Fuel Pump Relay Diagnosis Hi! I’ve seemed to isolate my no start issue on the 2010 X5 3.0 to a faulty fuel pump relay, but in testing the relay all variables seem ok? I get Clicking when energizing the relay between 85/86 terminals, resistance across same terminals is 95ohms. 30/87 terminals are open when de-energized and closed when energized. I jumped the terminals on the relay connector and confirmed the fuel pump runs when energized. Then I checked the other points for DME voltage when cranking and get 9.0 volts or thereabouts. So that seems to be working. Just wondering before buying the $50 relay from my dealer, whether it may be something else? 20amp fuel pump fuse #150 is fine. Feedback is greatly appreciated. Paul
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01-31-2019, 01:24 PM	#2
rodnex Private 22 Rep 57 Posts Drives: E70 3.0si, E70 3.0d, E70 X5DUS Join Date: Sep 2017 Location: Island iTrader: (0)	Hi, had similar issue, car sometimes just didn't start... Used the relay from my E39 (it got a couple of those for rear window heater etc) But it is actual just an universal relay with nice BMW logo on it, so you can buy a similar one for 5 bucks in any car parts shop.
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01-31-2019, 03:44 PM	#3
PaulSidiro New Member 0 Rep 11 Posts Drives: 2010 X5 Join Date: Mar 2018 Location: PNW iTrader: (0)	Thanks! Yes it was a very quick repair, the relay was the issue. Gouged by my dealer $50 for the relay, but I needed it ASAP. Found it online and at other private bmw shops for $22 or go to a motorcycle BMW dealer for $24. Pretty much a monopoly o BMW parts in my city. Cheers!
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