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Dayroock
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Joined: Jul 07, 2014
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PostPosted: Mon Jul 07, 2014 9:16 pm Reply with quote Back to top

Hello!
I have a 1992 Audi S4. The fuel pump went out so i replaced it, it worked fine for about a week. Now the fuel pump wont turn on while plugged in. I tested if it is getting the right amount of voltage, with just the key on it rests at .02v when i turn the key over it only goes to .05v. I have no idea what would cause this and haven't been able to find anything online.

Please help!
 
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NickJones
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Joined: Oct 21, 2004
Posts: 219
Location: Somerset UK

PostPosted: Wed Jul 09, 2014 8:15 pm Reply with quote Back to top

Check fuel pump fuse first. Don't know which one it is but probably shown on the fusebox lid.

If that's ok then I suggest checking the fuel pump relay. Once identified it should be possible to remove it from it's socket and bridge the power pins in the socket to see if that makes the pump run.

Cheers

Nick

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Nick Jones
Somerset UK
A6 2.5TDI
Triumph Vitesse 
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Dayroock
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PostPosted: Wed Jul 09, 2014 8:17 pm Reply with quote Back to top

The fuse is good, so ill have to look into the relay. Thank you!
 
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spink
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PostPosted: Fri Jul 11, 2014 11:58 am Reply with quote Back to top

furthest right relay under the trim under steering wheel if you are having trouble finding it
 
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Dayroock
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PostPosted: Tue Sep 02, 2014 2:18 am Reply with quote Back to top

So, i checked at the relay is good but i replaced it just in case. it still does not run, although i checked if all the wires were giving the correct voltage output and the one running from the ignition switch to the relay is not geting the correct voltage, do you have any ideas on what could cause this?
 
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spink
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PostPosted: Tue Sep 02, 2014 6:10 am Reply with quote Back to top

Ignition switch buggered?
 
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Dayroock
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PostPosted: Tue Sep 02, 2014 6:15 am Reply with quote Back to top

It sends less than 12v then when you try to turn it over it drops to 8-10v so it isnt enough to get the relay to do its thing. how would i know for sure if it is that?
 
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spink
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PostPosted: Tue Sep 02, 2014 6:37 am Reply with quote Back to top

take the connector off the back of the switch and either bridge which ever pins you need to or just give the fuel pump relay wire direct voltage then test at the pump again.
 
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Dayroock
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PostPosted: Wed Sep 03, 2014 5:58 pm Reply with quote Back to top

Thanks, just ordered a new ignition switch. hopefully this will fix it.
 
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Dayroock
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PostPosted: Mon Sep 08, 2014 11:14 pm Reply with quote Back to top

New ignition switch in, the volts going to the relay are better and dont drop now. It still doesnt send enough to the fuel pump, we tryed to jump it and the fuel pump worked but it was not starting... any more ideas?
 
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