re. must find a way to get home without fuel regulator:100Q fuel

Denis sparkplugvw at
Thu Dec 23 09:07:05 EST 2004

thanks Ben, i really appreciate.

Yes Ben the regulator does not supply enought pressure.
But another problem had borned the day i got here in this town.....
When i stopped the engine in the late evening, -30C the timing belt missed a tooth.

The eningin ran as before but much harder to start,,, then the day after,,, was inpossible to start it.

I then do the last thing i tough: jump 1 tooth.
I had fuel and spark and same pressure ;65psi on fuel. The pressure is still to low but the car can run to back home.

I need to find the problems anyway.

Befere the timing belt problem I did a test for the fuel pump;I sqeezed the return line(with a little rubber hole in the line) to make the system pressure higher but it did not work. The pump should have pump more pressure ! no i only got .5bar more, almost 5 bar.

So now i m thinking the new pump is not so good.It been installed last year. I would try my V8 pump ?

I m not home now and i must leave ,, i ll keep you posted.
thanks again Ben 

  ----- Original Message ----- 
  From: Ben Swann 
  To: Denis 
  Cc: quattro at ; Ben Swann 
  Sent: Thursday, December 23, 2004 12:08 AM
  Subject: re. must find a way to get home without fuel regulator:100Q fuel


  Have had little time to reply to general requests lately as I've been swamped in my own muck and mire, but your situation urges me to try to provide whatever help I can, even if 2000miles away.  At this point, can you reiterate concisely  the exact symptoms  - for example, what leads you to conclude that the fuel pressure regulator is bad?

  Have you tried to jumper the fuel pump on with the ignition?  A few ways to do this (1) Substitute the fuel pump relay with one of the orange relays, or (2)simply use a wire capable of handling 30 AMP continuously that has 2 spade lugs on the end.  Look at  one of the Orange (load reduction) relays to see which of the terminals needs to be bridged as those will be the BIG ones.  A jumper wire across these ( 30? and the one directly across from it 85?) will run the pump.  Don't leave the wire hooked up when not running the engine as you'll drain the battery. You can use an orange load reduction relay or a substitute that may be available at a store nearby, you can just use the key and turn ignition on which will run the fuel pump, and just continue to use that relay until you get home and resolve the problem.

  Once you have  fuel pump running continuously, you can lift the airflow-sensor plate a couple of times to prime the engine.  A 3mm allen wrench can be used to lift the plate.  If not available, a small flat-tipped screwdriver may work to grab the screw in order to lift the plate. Be careful not to turn the mixture adjustment, but only use enough "turning pressure" to grab the mixture adjustment screw so you can lift the plate.  If it doesn't lift readily, perhaps the airflow sensor plate is jamming, which could be the problem - then you'll need to remove the intake boot and see that there should be no binding.  If the a.f. sensor plate is binding, you can re-center it with a 10 mm socket, but don't mess with it unless you are sure  the plate is binding.  Sometimes the plates can bind because some devris got in and is catching and causing the plate to seize in place and a simple cleaning gets everything working again.

  Assuming there is no major air leak in the intake tract, the engine should start and run enough to get the plate lifting on its own.  You may need to adjust the throttle-body screw counter-clockwise to pass more air to keep from stalling.   Normally the screw should be turned all the way in and the ISV does the rest, so you might need to disconnect Idls Stabilizer valve to avoid hunting/idle bouncing if you mess with the throttle screw, but that may get you home.

  If the airflow sensor plate seems hard to lift  with the intake boot removed using a pair of needlenose pliers on the 10mm plate  bolt while the pump is running, then indeed you have some sort of fuel system blockage - either the return flow to the tank through the difeerential pressure regulator or main fuel pressure regulator, or other line blockage (ice in the return line?).  If this is not the case, as it sound below you are able to lift the plate easily and induce fuel to the injectors, then the problem should not be to difficult to fix without special parts.

  Get back with a recap. of the problem, symptoms and what you have done.  Try to explain things as concisely and precisely as you can - this will make it easier for us on line to help you.  Also, weather conditions and possibility of water in the gas, or anything else that can clue into the problem will help.

  Hang in there!


  [From: "Denis" <sparkplugvw at>
  Subject: must find a way to get home without fuel regulator:100Q fuel
  To: <quattro at>
  Message-ID: <BAY21-DAV7219E2630F1687AB9FA5EBBA40 at phx.gbl>
  Content-Type: text/plain; charset="iso-8859-1"

  Well, i m stuck here 350km from home without fuel regulator.
  Its Christams time and impossible to get a regulator.....
  If i let the car here it ll be in pieces when i ll be back to get it.

  I must find a way to connect the fuel direct to the fuel distr. and make a tap for return line. At least it would supply more than 70psi fuel pressure.....

  I tried again to squeeze the return line to make the system pressure higher . I got 5 bar or 72 psi but i did not get fuel to the sparkplugs. I only get fuel when i push the distr plate rom the air filter.......

  What makes the fuel goes trough the injectors without i push it ? when i start it suppose to get fuel !!!!


More information about the quattro mailing list