[T3] Cold Starting Problem

[Bob Rogers]

I have noticed that the fuel pressure slowly diminishes after the engine is shut off.  It takes about three hours for the pressure to approach zero.  

  ----- Original Message ----- 
  From: Russ W 
  To: type3 at vwtype3.org 
  Sent: Thursday, December 23, 2010 10:07 AM
  Subject: Re: [T3] Cold Starting Problem


  On 12/23/2010 9:52 AM, Bob Rogers wrote:
  > The fuel pump is a newly re-build.  The fuel pressure was originally steady at 31psi.  I thought that top limit might be causing the engine to flood in cold temperatures so I adjusted it to 28lbs. Cold starting problems occur at any temperature under 50 degrees.  Average high temperature here in Kansas this time of the year is about 30 degrees.

  Try this.  Build the fuel pressure as normal with your pressure gage 
  attached.  Now shut the engine off, and watch the fuel pressure.  It 
  should drop to about 20 psi right away, and then hold, or creep down 
  very slowly.
  If it drops all the way down fast, then you have something in the system 
  leaking.
  Build it again, and be ready to clamp the incoming fuel line on the left 
  side of the engine as soon as you shut the pump off.  If it still drops 
  fast, then you have a leak in the engine area.  If it holds, then the 
  pump check valve is leaking.
  You can work your way around the engine like this clamping various 
  hoses, to isolate various components.

  -- 
  Thanks,
  Russ Wolfe
  russw at classicvw.org

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