Fuel pump not running
John Larson
viejoloco at comcast.net
Fri Mar 28 12:12:22 PDT 2014
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
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