[Vwdiesel] I have an idle, but it dies on acceleration

[mfgavia at aol.com]

 Loren,

Funny you should mention the fuel coming out of the return line.? 
I observed virtually NONE coming out when I first started it and had the intake and return line in a clean gallon jug of fresh fuel.? Even at what higher rpm I could get, I still didn't see fuel.

Intake and exhaust are clear, the fuel filter is new, I can quite easily draw fuel from the tank by putting suction on the return line and pulling it  through the filter and pump.

It sounds like the vane pump may be my problem!

Thanks everyone - I'm timing it tomorrow, I'll then see what I can do to free up the vane pump.

Mark
portland, or
82 vanagon w/ 1.9 AAZ TD 




  You can pull the return line and see how much fuel come out 
from the pump and injectors and ideally compare that to a 
running VW diesel, then you'll know if the vane pump is starving 
it out or not.
  If it's the vane pump then a tow start might help to get the 
rpm up farther than the fueling is allowing, keep it in a lower 
gear to get the rpm up while towing.  
  If the pump is putting out then I'd check for a rats nest in 
the intake or exhaust to start with, then go to the fuel filter, 
check the supply and return lines for restriction, etc.  
    Loren



 


 


 

-----Original Message-----
From: LBaird119 at aol.com
To: vwdiesel at vwfans.com
Sent: Tue, Aug 18, 2009 12:02 am
Subject: Re: [Vwdiesel] I have an idle, but it dies on acceleration










In a message dated 8/17/2009 10:33:21 PM Pacific Daylight Time, 
jhsg at sasktel.net writes:

> The
> vanes usually free  up by themselves eventually if that's the cause.

  You can pull the return line and see how much fuel come out 
from the pump and injectors and ideally compare that to a 
running VW diesel, then you'll know if the vane pump is starving 
it out or not.
  If it's the vane pump then a tow start might help to get the 
rpm up farther than the fueling is allowing, keep it in a lower 
gear to get the rpm up while towing.  
  If the pump is putting out then I'd check for a rats nest in 
the intake or exhaust to start with, then go to the fuel filter, 
check the supply and return lines for restriction, etc.  
    Loren
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