Date: Thu, 9 Aug 2001 07:37:02 -0700
Reply-To: Karl Wolz <wolzphoto@WORLDNET.ATT.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Karl Wolz <wolzphoto@WORLDNET.ATT.NET>
Subject: Re: Fuel pressure & injectors
Michael,
I just did the pattern test not too long ago.
You should be able to tie the belt up out of the way, and what you want to
do is disconnect the secondary coil wire and have a friend turn the key so
that the engine turns for just a couple seconds while you observe the spray
pattern.
I simply placed a paper towel under the injectors. This gave me better
visibility and also caught all of the fuel.
Karl Wolz
----- Original Message -----
From: "Michael Townsend" <townsend@RTP.ERICSSON.SE>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Thursday, August 09, 2001 6:12 AM
Subject: Fuel pressure & injectors
> You know, while I have my ac compressor removed, it might be a good time
to
> remove and check my fuel injectors, because I suspect dribbly injector
> syndrome (mediocre mileage and oil that smells like gas). Now, I can pull
> them two at a time and turn the key enough to turn on the fuel pump to
> check for the dribbles. To check the spray pattern, I don't want to start
> the van with two injectors removed and the ac belt flopping around. I am
> also too lazy to remove it completely and bench test it with the
compressed
> air method. I was wondering if I just put an external 12V power supply on
> it to pop them open while I have the fuel pump on if I could observe a
> decent pattern without blowing myself up. I have heard that the injectors
> simultaneously have 12V on them, like they are continuously running with
> the engine on. How on earth does this work? It seems like you should
only
> inject before the compression stroke!!
>
> I have a mechanic friend who checks for leaky injectors by hooking up a
> fuel pressure guage, running the engine a second and shutting down. If
the
> pressure remains without decreasing, the injectors are not leaking.
> However, this wouldn't work in a Vanagon, would it? Isn't the other end
of
> the fuel rail being returned to the gas tank, so that the rail does not
> stay at 40 psi without the fuel pump running? I can't imagine the whole
> gas tank being pressurized because of the vent line through the charcoal
> filter.
>
> Finally, in order to check my fuel pressure, the FLAPS guages say they are
> for Ford, GM, or Chrysler fittings. Is there a way to make them work on
> our Vans? Where do you hook them up and how?
>
> Thanks,
> Michael Townsend
> 90 Carat
>
| 
