[T3] Fuel Primer Switch.....

William Jahn willjahn975 at gmail.com
Wed Sep 26 13:02:10 PDT 2018


I’ve seen inside an old one I cut apart . The metering plate and seat are metal , I would imagine over time and since this started not long after I was not driving the car very often the fuel has ethanol 10% that’s just sitting there which probably caused the metering plate and seat to rust enough . If I recall when there is no pressure from fuel the spring closes the metering plate on the seat . My main point is it might be rust /pitting that would cause the regulator to allow fuel to leak by . 

 I’m not about to rush out and buy a new one #1 because of the cost and #2 who knows how long it sat on some shelf perhaps missing the caps or a cap then moisture would enter and the new one may not seal either.  Once it is primed it starts and even 10 hours later it will still start right up ,unless it sits over night and if a few days it needs more time running the pump to get the air out. 

 It’s the same issue with the battery. Within a 2 mile drive stop and go traffic I may start the car 4 times and since sitting in traffic you are running off the battery , in doing so the battery after a few times doing this does not fully charge. Plus now we had such a long HOT summer sitting in a hot garage only speeds up the normal self discharge rate . I wouldn’t think the 5 mA draw that VR has would do much even though I would prefer to not have any drain yet I have asked anyone who has the later electronic VR’s to check if it is normal , I don’t believe it is. 

 I recall last trip on the freeway watching the voltmeter I noticed when I did stop after 10 miles of steady driving the voltmeter at idle was 13 volts when before it was below 12 volts. 

Sent from Mail for Windows 10

From: Jim Adney
Sent: Wednesday, September 26, 2018 10:55 AM
To: type3 at vwtype3.org
Subject: Re: [T3] Fuel Primer Switch.....

On 25 Sep 2018 at 20:14, Keith Park wrote:

> Your pressure regulator is no longer holding pressure,
> replace it and the problem goes away, however... there is no way to know 
> if the replacement is good till you get it on there and adjusted.

I doubt if it's the pressure regulator; Keith's the only one who's 
ever had problems with a pressure regulator. I know he's had 2 fail, 
but not in that way. The pressure regulators have a metal to metal 
valve/seat that should not change unless there's something in there 
that can rust. I cut one of Keith's apart just to see how they were 
made and they are pretty impressive.

> Jim's kits are an easy workaround for this.

Yes, you're making a very simple problem into a difficult one.

-- 
*******************************
Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
*******************************

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