Fuel pump not running

[John Larson]

On 3/27/2014 8:14 PM, Radek wrote:
> Mystery solved:  ground on the FP was bad.  Now it's the question of 
> fixing the harness - fuel pump connectors are quite special and I'm 
> not sure where to find replacements.  If I have to, I'll solder wire 
> directly to the terminal.
> Car seems to be idling fine with the FP hot wired, didn't test it on 
> the road.  Once I fix the pump wiring, will road test (car is 
> temporarily without Fuel Pressure Accumulator) for drivability issues.
> Cheers;
>
> Radek.
>
>> ------------------------------
>>
>> Message: 3
>> Date: Sun, 23 Mar 2014 23:10:39 -0400
>> From: Huw Powell <audi at humanspeakers.com>
>> To: quattro at audifans.com
>> Subject: Re: Fuel pump not running
>> Message-ID: <532FA22F.8010104 at humanspeakers.com>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> If there is no coil pulse FPR kills the pump.
>>
>> Probably not your problem, but a data point.
>>
>> Does the car start and run with the FP hot wired?
>>
>> On 3/23/2014 7:32 PM, Radek wrote:
>>> Greetings to all;
>>>
>>> This is a suite to the JB Weld thread, probably better addressed 
>>> under a new heading.  Here's what happened:
>>> Car is 88 90Q.  Since I couldn't get a new fuel line connecting the 
>>> fuel pump to the pressure accumulator and a replacement was hard to 
>>> find, I decided to temporarily bypass the accumulator so the car 
>>> could be started and moved out of the garage. I went to the local 
>>> boneyard and got some fuel line banjo fittings (17mm and 19mm) and 
>>> connected the fuel pump directly to the fuel filter.  Car started 
>>> without a problem and I drove it out of the garage.
>>>
>>> The next day, though, it would not start anymore.  Fuel pump was 
>>> dead. Fuse is OK, fuel pump relay replaced with a known good one - 
>>> no result. With the ignition key "on" there seems to be no power to 
>>> the pump's red terminal.  However, when hot wired, the pump works.
>>>
>>> So, there must be something cutting the power supply to the fuel 
>>> pump. My question is:  is there any device in the car (fuel pressure 
>>> sensor, for example) that would prevent power supply to the pump?
>>> Or should I look instead at the wiring and grounds?  BTW, would 
>>> anyone know where to buy the fuel pump connectors (look like Marette 
>>> twist electrical connectors)?  TIA.
>>>
>>> Radek
>>> 88 90Q
>>> V8Q 5-sp
>
>
The connectors used on this pump, if it's the one with the red and blue 
plastic threaded plugs, are a pretty common Audi part.  I believe I have 
some, and could look in the barn this afternoon or tomorrow morning.  
priority Mail would get them anywhere in the CONUS is 2-3 days.  Lemme know!

John