Think my fuel pump died... Pointers? - BMW M5 Forum and M6 Forums
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post #1 of 12 Old 23rd December 2016, 01:18 AM Thread Starter
travish325
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Think my fuel pump died... Pointers?

Car was running fantastic then I shut it off and came back an hour later and it won't start. It will try but sputter and barely run then die. Now it is to the point where it just cranks and tries to sputter. I jumped out the fuel pump relay or so I think I did (it's the bigger relay on the passenger side in the trunk right?) Anyway the pump did not turn on when jumped and I had good 12vdc going in. However, I couldn't feel the relay clicking when I had my friend turn the key over so that is leading me to believe something else is wrong, maybe my hand just isn't sensitive enough... Anyway, is there anything else I can check to be sure it's the pump?
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post #2 of 12 Old 23rd December 2016, 01:48 AM
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post #3 of 12 Old 23rd December 2016, 01:51 AM Thread Starter
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That's the procedure I followed, but I never could feel the relay click when turning the key. I'm just worried I'm going to purchase a new pump and find our it was the wiring or relay
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post #4 of 12 Old 23rd December 2016, 02:08 AM
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It won't click. It's not a mechanical relay but a solid state control module. If you jump the pins and you don't hear the pump running then your pump is dead or less likely the fuse is blown. You can hook a voltmeter to the pump while you turn the key on to prove the relay is sending power to the pump.
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post #5 of 12 Old 23rd December 2016, 02:19 AM
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It won't click. It's not a mechanical relay but a solid state control module. If you jump the pins and you don't hear the pump running then your pump is dead or less likely the fuse is blown. You can hook a voltmeter to the pump while you turn the key on to prove the relay is sending power to the pump.
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post #6 of 12 Old 23rd December 2016, 02:47 PM Thread Starter
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Originally Posted by xrviz View Post
It won't click. It's not a mechanical relay but a solid state control module. If you jump the pins and you don't hear the pump running then your pump is dead or less likely the fuse is blown. You can hook a voltmeter to the pump while you turn the key on to prove the relay is sending power to the pump.


Aha I see, that makes sense then. I went back about 2 hours later to trailer and the damn thing started right up, I could hear the fuel pump running this time. Looks like ill be changing it out this weekend.

-E39 M5 (DD)
-94 Land Cruiser (Stock For now)
-01 Bullitt (800whp toy)
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post #7 of 12 Old 23rd December 2016, 06:49 PM
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Aha I see, that makes sense then. I went back about 2 hours later to trailer and the damn thing started right up, I could hear the fuel pump running this time. Looks like ill be changing it out this weekend.
Very common E39 bug. Symptoms are spot on for a pump failure. You can always get it to start by thumping it with a hammer It'll go for months longer that way, but it gets a little frustrating lifting the back seat each time you want to start the car...

It's an easy swap. You just have to be happy to have one hand stinking of petrol for a while if your tank is still full.

Last edited by 100%Cocoa; 23rd December 2016 at 06:50 PM.
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post #8 of 12 Old 23rd December 2016, 07:02 PM Thread Starter
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Originally Posted by 100%Cocoa View Post
Very common E39 bug. Symptoms are spot on for a pump failure. You can always get it to start by thumping it with a hammer It'll go for months longer that way, but it gets a little frustrating lifting the back seat each time you want to start the car...

It's an easy swap. You just have to be happy to have one hand stinking of petrol for a while if your tank is still full.


Good thing I have less than a quarter tank!

-E39 M5 (DD)
-94 Land Cruiser (Stock For now)
-01 Bullitt (800whp toy)
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post #9 of 12 Old 24th December 2016, 04:30 AM
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Car was running fantastic then I shut it off and came back an hour later and it won't start. It will try but sputter and barely run then die. Now it is to the point where it just cranks and tries to sputter. I jumped out the fuel pump relay or so I think I did (it's the bigger relay on the passenger side in the trunk right?) Anyway the pump did not turn on when jumped and I had good 12vdc going in. However, I couldn't feel the relay clicking when I had my friend turn the key over so that is leading me to believe something else is wrong, maybe my hand just isn't sensitive enough... Anyway, is there anything else I can check to be sure it's the pump?
Its the pump. Happened to mine during the summer. Was driving for 30 min, went into a store for about 40 min. Come back out and would fire up but then die instantly. My relay was fine, the pumps i guess just do that randomly. Sucks because it was my DD and i was frustrated for a good week, due to towing and figuring out how to get a pump as fast as I can.
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post #10 of 12 Old 24th December 2016, 04:33 AM Thread Starter
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Well I got the pump and filter changed out, but... When I was putting the sending unit back in, the plastic piece that hangs off broke off. I grabbed the piece and set it aside, I was pretty pissed so I said "screw it" and put the unit in and sealed it up. When I started the car and ran it the fuel level read the same as it did the day before so I'm not sure if that plastic piece is important or not.
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