Date: Sat, 27 Jul 2019 18:08:06 -0700
Reply-To: vw_van_fan_Mark <madvws@COX.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: vw_van_fan_Mark <madvws@COX.NET>
Subject: Re: First ride of shame, fuel issue
In-Reply-To: <ECC8BB03-B85C-45AC-89AD-2DF5C5536ADF@comcast.net>
Content-Type: text/plain; charset=UTF-8; format=flowed
The relay clicking again after a moment means the ECU is controlling the
FP relay as it should at that point.
Your friend would only see power at the fuel pump during that very brief
time between relay clicks. Probably couldn't see it on a meter since it
is so brief.
While the engine is cranking the ECU should turn the relay on and power
the fuel pump continuously. Then measure between the + terminal of the
pump and - terminal. If nothing, try measuring between the + terminal
and chassis metal near the pump.
If still nothing is measured at the pump, behind the air cleaner is a
single wire connector that connects from the fuel injection harness and
FP relay forward to the fuel pump. This wire powers the fuel pump when
the ECU tells the relay to turn on.
Mark
Eric Caron wrote:
> Hi listers,
>
> Keep the tips coming.
>
> Here is a update.
>
> Remember, this started as a loss of power going up hill then the van stopped running. It then cranked strongly but didn’t start.
>
> Friend check power at the fuel pump and found no power.
>
> I just checked the relays with the Mark method.
> When key turned I hear two clicks and then a moment later a single click.
>
> This sounds like Mark’s description of working relays.
>
> With my next helper I hope to check for power coming from the FP relay
>
> I can also remove the battery and bring it to a place for testing.
>
> But would I have had the loss of power when the van running hard due to a bad. Battery that still cranks?
>
> Would the ECU be bad if I’m hearing both relays click at key turn?
>
> Keep the tips coming. Remember recently together we solved my last van problem with the wheel squeal. We can solve this one together.
>
> Eric Caron
> 85 GL Auto
>
>
>> On Jul 27, 2019, at 4:32 PM, kenneth wilford (Van-Again) <kenwilfy@COMCAST.NET> wrote:
>>
>> We have been seeing failed ECUs causing this issue for a while on the
>> 1.9ls. The ECU actually sends a signal to activate the fuel pump relay.
>> When this part of the ECU fails then the fuel pump relay won't get
>> activated and the fuel pump won't come on. I have seen several folks do a
>> rig up that powers the fuel pump relay some other way (like using the power
>> to the coil from the ignition key) and this activates the fuel pump as soon
>> as you turn on the key and allows the van to start. However I would not
>> continue to use the van in this condition but get a rebuilt ECU instead.
>> If you have another Vanagon owner that is local with an 83-85 1.9l Vanagon,
>> you could easily swap in their ECU to see if that fixes the problem. Save
>> you a lot of troubleshooting.
>>
>> Ken
>>
>> On Sat, Jul 27, 2019 at 4:13 PM OlRivrRat <OlRivrRat@comcast.net> wrote:
>>
>>> On 27 Jul , 2019, at 12:14 PM, Eric Caron wrote:
>>>
>>>> I’m not ruling out a bad start battery either but it does seem to be
>>> operating the starter. It did so strongly on the side of the road and a
>>> bit less so now. I have a charger on it now.
>>>
>>> Do have the Battery Tested ~ If You happen to have 1 Shorted Cell
>>> & the other Cells have a good charge It will
>>>
>>> crank well but there will not be enough Voltage to make the ECU "Happy"
>>> enough to allow a Start ~
>>>
>>> Had this happen to Me Many Many Years ago in 1 of My VDub Vans ~
>>
>>
>>
>> --
>> Thanks,
>> Ken Wilford
>> John 3:16
>> www.vanagain.com
>
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