[Vwdiesel] Priming a pump

Mon Apr 30 09:03:29 PDT 2012

I see what you are saying, that is just how I do it most of the time.
Sometimes I do not bother going back to crack the hard lines at the top of each injector at all.

Here is how I learned that lesson when I first got my 1.9na running about 15 years ago......
I did not know much about diesel injection or setting the timing, I had no idea.
I installed the engine in the van and had AAA tow it to a garage that had an old German mechanic, Gunther.

One of his other helpers who knew VW diesels put on the timing belt and set the pump timing.  We get the engine running and it sounds good.  I do not remember him cracking the hard line before or after we got it running.  I pay him for the time and down the road I go 4 miles back to my house.  Less then 2 miles down the road I hear this rapping sound as if my new engine is toast, my heart is in my stomach.  I pull over and shut it down.  Call AAA again and flat bed the van back to the shop.  Old man Gunther comes out to see what the issue is.  The noise is gone, the motor sounds fine again, ??? I tell him what it sounded like.  Then as we are looking at the motor and watching it run, the rapping sound comes back.  He pulls an open end 17mm out of his back pocket and cracks the injector lines one by one.  You have a STUCK injector, air locked because of air in the lines he says.
Don't worry about that noise that sounds like your engine is history, it is most often a stuck injector.

When it happens, crack the lines one by one to let fuel out, shut it down, restart and all will be fine.  That is how I learned about air in the hard lines.

So, I always get it running first and then crack the lines one by one, but you could try and do it before it starts I guess.  But whenever I use my mighty vac to suck fuel into and through the pump it useually starts in the first 10 to 15 seconds of cranking.

Bryan Belman, Pt. Pleasant, NJ
04 Jetta Wagon TDI PD, 100hp, 5sp -- running :<)
92 Jetta 1.6 Eco-Turbo Diesel, 5sp -- running :<)
82 Diesel Westy 1.9NA -- running :<)
70 Type 1 stock Elm Green Beetle -- Under Restoration :-)

From: mikitka <mikitka at embarqmail.com>
To: vwdiesel at vwfans.com 
Sent: Monday, April 30, 2012 8:28 AM
Subject: Re: [Vwdiesel] Priming a pump

I was thinking the same thing.  You would normally crack the injector lines
when you are turning it over to purge the lines of air so it would start.

Nick

-----Original Message-----
From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
Behalf Of Tad
Sent: April 30, 2012 1:46 AM
To: mailing list
Subject: Re: [Vwdiesel] Priming a pump

At risk of sounding like a smartypants... is the injector-cracking
necessary?  If the cylinder is firing, doesn't that mean that the line is
purged of air, since any air would prevent the injector from opening due to
its compressibility?

On Sun, Apr 29, 2012 at 4:21 AM, Bryan Belman <dieselwesty at yahoo.com> wrote:

> I do the same but use a mighty-vac to do this.  Pull fuel into the 
> pump to fill it via the Out banjo and once you have it full, put the 
> correct Out Banjo back on and it will start very easily assuming 
> timing and everything else is setup properly.
> once it is running, crack each injector one by one with a rag on it to 
> let some fuel out.  This will help purge any trapped air in hard injector
lines.
>
> Make sure that you set your timing with the timing advance cable knob 
> pushed all the way in towards the dash.  !!
>
>
> Bryan Belman, Pt. Pleasant, NJ
> 04 Jetta Wagon TDI PD, 100hp, 5sp -- running :<)
> 92 Jetta 1.6 Eco-Turbo Diesel, 5sp -- running :<)
> 82 Diesel Westy 1.9NA -- running :<)
> 70 Type 1 stock Elm Green Beetle -- Under Restoration :-)
>
>
> ________________________________
> From: Andrew .Libby <libbybapa at gmail.com>
> To: Stephen Kraus <ub3ratl4sf00 at gmail.com>
> Cc: vwdiesel <vwdiesel at vwfans.com>; cosborn at epix.net
> Sent: Sunday, April 29, 2012 12:27 AM
> Subject: Re: [Vwdiesel] Priming a pump
>
> I use a spare IN bolt in the Out bolt hole along with a spare IN 
> fitting and an outboard primer bulb.  It pulls the fuel right through 
> the filter and pump.  Once there is a smooth flow I replace the OUT 
> bolt and fitting and without cracking the injectors it typically takes 
> 10-20 seconds of cranking to fire up.
>
> On Sat, Apr 28, 2012 at 8:45 PM, Stephen Kraus <ub3ratl4sf00 at gmail.com
> >wrote:
>
> > Open the return fitting and trying cranking, it SHOULD help pump it 
> > through.
> >
> > On Sat, Apr 28, 2012 at 9:34 PM, <cosborn at epix.net> wrote:
> >
> > > What is the best way to prime my bosch pump?  I have fuel in the 
> > > line
> > from
> > > the filter to the pump, but I do not get any fuel to the injectors 
> > > when cranking even after I loosened the injector pipes.  Should I 
> > > pour some
> > fuel
> > > into both fittings (inflow and return)?
> > > Craig
> > > _______________________________________________
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> > >
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