Fuel Pump wires charred on 1990 Audi 100

Tony Hoffman tfh400036 at yahoo.com
Sun Sep 25 11:08:48 EDT 2005

This is actually quite common on older Audi's. Usually it leads to eating pumps, though. I've relayed everyone of mine just to make sure I avoid this. The first time I experienced this was on a Fox that was about 15 years old at the time. That seems to be around when problems start to show up.
Tony Hoffman

David Glubrecht <daveglu at hotmail.com> wrote:
charred wires on an Audi often point to a high resistance connection.
If it is away from a connection, then look into amperage.
I have had a fuel pump that was very noisy and continued to run until it 
siezed and broke the drive tabs internal to the pump and still did not blow 
the fuse.
Dave G

----- Original Message ----- 
Sent: Saturday, September 24, 2005 7:26 PM
Subject: Re: Fuel Pump wires charred on 1990 Audi 100

> "Jim Jordan" writes:
>> I stumbled onto a 1990 Audi 100 that is not operating because the
>> fuel pump apparently failed while being driven.
>> the insulation on the wires was charred
>> Any ideas why this would happen? Would a fuel pump seize and draw
>> enough current to burn the wires before a fuse popped?
> I've seen this happen on a dorF Ranger, pump was evidently seizing at
> just the right amperage and time cycle to not blow the fuse, but enough
> to get some whiffs of smoke coming out from under the dash....took a
> while to put 2 + 2 together (which on a Ford adds up to 3 BTW.) I'd
> still check for chaffing of the wire somewhere too, just in case.
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