Is it possible you have a relay that is faulty?    Maybe it stays on and
then does not dis-engage when
it is suppose to?   And then sometimes doesn't engage when it is supposed
to?    Try swapping
out relays just to do a quick check.   You can jumper the relay socket to
be sure the wiring
is okay too.

Steven
91 Westy

On Wed, Apr 18, 2018 at 4:49 PM, thewestyman <zolo@foxinternet.net> wrote:

> Mark,
>
> Thanks for the reply.
>
> What's happening; key on does not have power to fuel pump or the relay, nor
> when I turn the engine.
> That 1-2 second is not there.
>
> What to do?
> Z
>
>
>
> -----Original Message-----
> From: vw_van_fan_Mark
> Sent: Wednesday, April 18, 2018 11:28 AM
> To: thewestyman ; vanagon@GERRY.VANAGON.COM
> Subject: Re: Progress, Puzzle on "Fuel pump won't work"
>
> When you first turn on the key the fuel pump only runs 1-2 seconds and
> then it stops. After that it should only run when the engine is turning.
>
> The ECU controls the fuel pump relay and only turns on the relay when it
> thinks it should. If the engine isn't turning the ECU thinks the pump
> isn't needed. This is for safety.
>
> Mark
>
>
> thewestyman wrote:
>
>> Hi guys,
>>
>> Interesting progress.
>>
>> I posted a couple of days ago that on this 1990 van the fuel pump stopped
>> working after I put in an other engine.
>> The only electrical was involved; the wires wore disconnected on the
>> starter, and the voltage regulator was changed to a new one.
>> And I drove this van before.
>>
>> There is no power on the fuel pump relay as it should be at all time while
>> the key is out.
>>
>> Now, I powered the fuel pump with a wire from the positive side of the
>> battery and it worked without needing the ground, which it has already.
>> This way the engine could start up and work fine.  The interesting part
>> is, that if I remove that wire when the engine is running, it still works
>> fine.
>>
>> That is a puzzle for me.
>>
>> Maybe some of you have experienced the same?
>>
>> I hope, some guru can chime in with knowledge.  I am terrible with
>> electricals, dumbfounded, clueless most of the time.
>>
>> All the fuses are good.
>>
>> A probable question is; where it that wire come from that would power the
>> fuel pump relay?
>>
>> Is there anyone out there who can help?
>> Please.
>>
>> With love to all the Vanagone lovers,
>> Zoltan
>>
>>