[Vwdiesel] More Quantum Questions?

[mark shepherd]

Bill
Top banjo on aneroid should have tube giong to inlet manifold.
Next banjo down should have a little 'willie' pointing down this is correct 
and is just and air vent.

The banjo hardest to see should have only 2 outlets as such. The fattest one 
should be connected to a pipe going back to the tank. the smaller one goes 
to #4  or other injector. This takes the small leakoff from injectors back 
to the tank. However, if this comes off then diesel should squirt out 
because of the back pressure of the main flow of from pump back to tank. 
Other unknown outlet should remain capped... Perhaps this is not an original 
banjo.

When cranking, with or without power to solenoid, diesel should squirt out 
of this banjo in an attempt to get back to the tank. If this is happening 
then the vanes in the pump are doing their job and you do not need another 
diesel filter etc.

You have no diesel out of those injector lines. Therefore the piston inside 
the pump is not squeezing diesel. This is pointing to either a lack of power 
to the solenoid above it, OR the solenoid is not lifting it's plunger to 
allow diesel.
Remove center timing bolt in middle of injectors and crank briefly. Do you 
get diesel spill?
No?
Check power to solenoid, and take it out and check operation.

The bolt on the output banjo is an ESSENTIAL element of pump operation.
It should have  a gauze filter inside it and just below the bolt's head, 
there is an accurately drilled hole [exposed to the banjo and only big 
enough for a fine sewing needle] that creates the back pressure  inside the 
pump, and this advances the timing of pump under operation, AND encourages 
fuel to go in front of the piston past the solenoid. I assume if hole is too 
big then pump wont pressurise correctly. We are looking at ball park 50 to 
150 psi.
Come back with more results, agreements, questions  etc

Mark

----- Original Message ----- 
From: "William J Toensing" <toensing at wildblue.net>
To: <vwdiesel at vwfans.com>
Sent: Tuesday, May 05, 2009 8:46 AM
Subject: [Vwdiesel] More Quantum Questions?


>
> Reply to Brian Decker. At the top of my IP is the banjo fitting from  the 
> turbo to the aneroid. below that is a banjo fitting connected to nothing. 
> Below that is the banjo fitting which connects the fuel return line to the 
> return line from the #4 injector. All 3 are in a vertical row at the rear 
> of the IP. What is the purpose of the middle banjo fitting? The bottom one 
> is marked "out" carries fuel from the #4 injector to the tank return line. 
> This bolt has no inside holes as does the banjo in the middle.
> I wonder if adding an electric fuel pump in line between the fuel filter & 
> the IP fuel inlet would help?
> Bill Toensing, Nevada City, CA
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