Fuel pump
Moderator: martauto
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corkie
- E30 Zone Addict

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- Joined: Thu Feb 21, 2008 11:00 pm
- Location: Hertfordshire
Hi i fitted a new pump and now the car wont start pump working any ideas please
e30
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Brianmoooore
- E30 Zone Team Member

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- Joined: Mon Jan 10, 2005 11:00 pm
Did you replace the whole pump assembly, or just the pump?
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corkie
- E30 Zone Addict

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- Joined: Thu Feb 21, 2008 11:00 pm
- Location: Hertfordshire
Just the pump its working but not pulling petrol tried priming and nothing it a proper bosch unit took it out put it in a bucket and put 12 v and works fine put back in and nothing bridged relay still nothing going crazy !!
e30
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Brianmoooore
- E30 Zone Team Member

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- Joined: Mon Jan 10, 2005 11:00 pm
Are the wires to the pump connected the right way around? If connected wrongly, the pump will try to suck petrol into the tank, not push it out.
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corkie
- E30 Zone Addict

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- Location: Hertfordshire
I had solderd the red to the + and the black to the - on the pump but the plug was the other way round so i swaped them !
e30
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corkie
- E30 Zone Addict

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Presuming the brown on the plug should go to the red or+
e30
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Brianmoooore
- E30 Zone Team Member

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The green/purple wire in the car loom must end up connected to the + terminal of the pump, and the brown wire in the loom must eventually connect to the - terminal on the pump.
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corkie
- E30 Zone Addict

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Ok had it that way originally and it still didnt work !so i presumed it wss wrong !i will swap them back tomm and try again ! Much obliged !how should i bridge the relay to check please ?
e30
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Brianmoooore
- E30 Zone Team Member

- Posts: 49359
- Joined: Mon Jan 10, 2005 11:00 pm
Link pins 30 and 87 of the relay socket to run the pump.
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corkie
- E30 Zone Addict

- Posts: 2153
- Joined: Thu Feb 21, 2008 11:00 pm
- Location: Hertfordshire
Again thanks !
e30
