[T3] Breather cap

[William J]

 What about the fuel pressure regulator ?  I've only seen drawings of one 
showing what's inside . It has a metal disc and a sort of machined end bore 
and the spring pressure against the disc is the actual adjustment when you 
turn the adjustment screw increasing /decreasing the pressure on the 
disc/valve . From what I can tell not ever cutting one open the fuel port on 
the side connected to the pressure side of the ring seems sealed from the 
spring area and one side of the disc other wise fuel would find it's way out 
the adjustment screw. What I don't know is when the system is shut down  is 
if the disc closes all fuel flow to the return . If it does then it could 
bleed off the pressure.

 I was thinking about this the other day . Say for example everything is 
well all the hoses and injectors cold start valve and pump , everything 
holds as well as it's designed to do and the regulator disc acts like a 
check valve when the flow is shut down and the liquid fuel still has 
pressure. . It's pressure in the system so it could bleed off at either end. 
Pressure side pump check valve or Return side regulator .

 Also reading the post on worn pump brushes and dirt and or water finding 
it's way into the tank because the over flow hose is cracked . Wouldn't even 
rust caused by ethanol based fuel because it absorbs water since these old 
systems closed venting is by now shot cause the pump brushes to fail . There 
is a filter before the pump some of this crap rust , dirt has to be trapped 
by the filter or are we talking very tiny particals the filter cannot stop.
----- Original Message ----- 
From: "Jim Adney" <jadney at vwtype3.org>
To: <type3 at vwtype3.org>
Sent: Saturday, August 26, 2017 8:49 AM
Subject: Re: [T3] Breather cap


> On 25 Aug 2017 at 21:20, Keith Park wrote:
>
>> Ive always been perplexed why some cars lose prime and others dont,
>> neither my old 73 or the 71 have ever had starting problems in that way, 
>> im
>> just running good ol Mahle hose, no plastic cover over the engine...
>> yet some cars do need the primer feature..  whats different with them?
>
> I wish I knew what the difference was. Some cars need it and some don't. 
> It's
> clearly not always the check valve, but sometimes it is. I've had cars 
> that had
> the problem and others that didn't. Nothing I changed seemed to make any
> difference, and I changed hoses and injectors and rebuilt pumps.
>
> In the end, a primer switch is a solution, regardless of the cause, so 
> that's
> the solution I recommend.
>
> -- 
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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