[Vwdiesel] Loss of power and rough running

[James Hansen]

Before you get all spendy and do pump and injectors, (unless they need it of
course) "T" in a vacuum gauge to your fuel line on the tank side of the
electric fuel pump.  Facet pumps can get clogged too- if it is situated
pre-filter, you can get a speck of crud (and I mean a speck) in a check
valve inside the pump, and it just clicks away, a tad quieter, but not
accomplishing anything except just clicking and thrashing away at the fuel.
NO flow occurs.  Bosch VE pumps are not designed to suck fuel, rather even
preferred to have a slight positive pressure, such as a couple psi like your
pump makes.
This is well documented on Canada's ex-military support vehicle, which I
have one of, the Iltis. The foam balls in the tank to prevent slosh would
flake off and small bits would impede the facet pump from pumping.

So when testing, if it still runs shitty, and you have no negative pressure
on the gauge, the tank to gauge is fine.  Then put the gauge on the other
side of the pump.  If it does it again, and there is pressure , you have to
look at the injection pump side.  Then T the gauge into the return, to prove
that flow to completely eliminate the fuel system outside the pump as a
culprit. You want to see no pressure on the return side.
-james

-----Original Message-----
From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
Behalf Of ralph meyermann
Sent: April-05-13 10:52 AM
To: Tad
Cc: mailing list
Subject: Re: [Vwdiesel] Loss of power and rough running

All the fuel lines seem to be clear of any excessive heat sources. I'm
planning on asking the most recommended diesel Dr in my area how much to go
thru pump and injectors.

Velma 82 na diesel westy
On Apr 5, 2013 11:22 AM, "Tad" <tadc at europa.com> wrote:

> Seems to me that it must be heat related if it only happens after 
> hours on the road.
>
> Maybe a vapor-lock situation?  Any fuel lines in a position to get a 
> lot of heat from somewhere?
>
> Or maybe your fuel pump is getting "tired" after hours of operation?
>
>
> On Thu, Apr 4, 2013 at 12:29 PM, ralph meyermann 
> <ralphmeyermann at gmail.com
> > wrote:
>
>> Hi all! I was wondering why after 2-3 hours of driving  I seem to 
>> loose power and it starts to run rough at idle and tries to die on 
>> me? I have put an inline fuel pump before the fuel filter that runs 
>> 4-7 psi. Thanks for any help/advice!
>> Velma 82 na diesel westy
>> _______________________________________________
>> Vwdiesel mailing list
>> Vwdiesel at vwfans.com
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>>
>
>
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