Date: Sat, 16 May 2015 11:37:30 -0700
Reply-To: Stuart MacMillan <stuartmacm@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Stuart MacMillan <stuartmacm@GMAIL.COM>
Subject: Re: Start up,back fire?
In-Reply-To: <CA+r=JhrRpWESHF9Dev5=o=wAxbyhA9MtmBBCy_dK4UjbFUF8cA@mail.gmail.com>
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Right, but it saves time to first learn if there is a fuel system problem at all. If there is, then you can pinch off the fuel hose to the left injector bank and determine which side is leaking, and pinch off the pressure regulator vacuum hose to test it. I hate taking things apart unnecessarily!
Stuart
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Larry Alofs
Sent: Saturday, May 16, 2015 10:10 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Start up,back fire?
It seems to me that if the fuel pressure leaks down too quickly, the cause could be an injector, the fuel pressure regulator, or the fuel pump. The first case is more serious than the last two. You need a way to tell which it is.
Larry A.
On Sat, May 16, 2015 at 11:35 AM, Stuart MacMillan <stuartmacm@gmail.com>
wrote:
> Easiest way to do the fuel leak down test is with a fuel pressure gauge.
> Bentley says system should hold pressure (30 psi or so) for several
> minutes after shutdown. If your gauge comes with an open hose
> adapter, slip it over the fuel tap near the distributor, and use a
> clamp. Otherwise cut it and splice it with a brass barbed coupling
> for other cars. Get the type that drains any residual gas out a
> separate line. Instructions here, including safety procedures:
> https://www.youtube.com/watch?v=QsqBJxKj1KQ
>
> Do it soon, backfires are hard on the AFM. I've used mine many times
> over the past 40 years to diagnose fuel system problems.
>
> Stuart
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On
> Behalf Of Dennis Jowell
> Sent: Saturday, May 16, 2015 3:19 AM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Start up,back fire?
>
> Question on why do I sometimes get a backfire from my 2.2 GOWESTY WBX.
> yesterday I drove the 88 gl Westy an 1.5 hr pulled over to check my
> GPS, shut the engine off. Then 2 minutes later started it and "bang"
> it backfired, it did start. Shut it down and tried again same thing.
> Drove home it didn't occur again. Any thoughts of what is going on?
> The new Engine has about 5000 miles on it. Maybe to many mice running
> around in there.
>
> Dennis Jowell
> Scotch Hollow Farm
> Newbury, Vermont
>
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