Checking a relay??
Moderator: martauto
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jimmyj
- E30 Zone Newbie

- Posts: 10
- Joined: Thu Apr 07, 2005 11:00 pm
Does anybody know how to check to see wether or not a relay is working properly? Its the fuel pump one which i suspect has gone but it could also be the pump itself. Wonderingt if theres any way of checking it before i go denting my wallet 
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Brianmoooore
- E30 Zone Team Member

- Posts: 49359
- Joined: Mon Jan 10, 2005 11:00 pm
You can check for power at fuse 11 (if you have the type of fuse where the fuse wire is accessible from the top), you can remove the relay from the equation completely by shorting together pins 30 and 87 of its socket (with a short piece of wire), or you can swap it temporarily with one of the orange ones in the main fusebox.
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jimmyj
- E30 Zone Newbie

- Posts: 10
- Joined: Thu Apr 07, 2005 11:00 pm
cheers for the help, ill give it a go now
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jimmyj
- E30 Zone Newbie

- Posts: 10
- Joined: Thu Apr 07, 2005 11:00 pm
did pins 30 and 87 and it just blew fuse, been told also pins 30 and 85, this didnt blow fuse but did nothing, also oi put other orange relay from the fuse box in and nothing happened when i tried to start it. To me it looks more and more like its the fuel pump, does this sound right??
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Brianmoooore
- E30 Zone Team Member

- Posts: 49359
- Joined: Mon Jan 10, 2005 11:00 pm
30 and 87are the correct pins. 30 an 85 could damage the ECU.
Fuel pump failure. ( jams up ) is fairly common. Another thread going on the subject at the moment.
Fuel pump failure. ( jams up ) is fairly common. Another thread going on the subject at the moment.
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jimmyj
- E30 Zone Newbie

- Posts: 10
- Joined: Thu Apr 07, 2005 11:00 pm
should it blow fuse when 30 and 87 are bridged?? still no noise from the pump at all!
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Brianmoooore
- E30 Zone Team Member

- Posts: 49359
- Joined: Mon Jan 10, 2005 11:00 pm
Could well blow the fuel pump fuse if the pump is jammed.
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jimmyj
- E30 Zone Newbie

- Posts: 10
- Joined: Thu Apr 07, 2005 11:00 pm
i took out the pump and turned the turbine inside with a screwdriver, it felt very stiff at first making me think there was a blockage, then turned smoothly. I put everything back together and still nothing happened , not even a buzzing from the fuel pump
, WHATS HAPPENING TO MY POOR CAR
?
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Brianmoooore
- E30 Zone Team Member

- Posts: 49359
- Joined: Mon Jan 10, 2005 11:00 pm
Check for power at the fuel pump connector with a 12V lamp of 5W or so. Don't forget the pump is only powered for a couple of seconds when you turn the ignition on, and when the engine is cranking or running.
If no power, check the fuse and then try bridging pins 30 and 87 of the pump relay.
The pump will fail again by the way, you need to find a replacement.
If no power, check the fuse and then try bridging pins 30 and 87 of the pump relay.
The pump will fail again by the way, you need to find a replacement.
