Re: Vacuum pump continously running

----- Original Message ----- 
From: "Hazem Sedra" <hazemsedra@...>
To: <ev@...>
Sent: Saturday, October 31, 2009 8:43 PM
Subject: Re: [EVDL] Vacuum pump continously running

>
> Thanks so much James for taking the time to help me out
> and write your datailed note to guide me.
>
> After reading your note, I looked for the valve switch on the vacuum pump 
> and
> found it.  I noticed the neck of the switch was broken off the valve 
> assembly and is made
> of plastic.  I will simply buy a new one and connect it to the valve 
> assembly.
>
    A Happy ending! Great! Happy motoring Hazem!

       Bob
>
> I appreciate your help and this forum.
>
> Hazem
>
>> Date: Sun, 1 Nov 2009 10:32:31 +1100
>> To: ev@...
>> From: jcmassey@...
>> Subject: Re: [EVDL] Vacuum pump continously running
>>
>> At 09:54 AM 1/11/09, Hazem wrote:
>>
>> >I am a new to this group
>>
>> Welcome, you're in the right place for EV advice. Not the only place, but
>> one of the best, and if you like the 'list' format over a 'forum' format
>> then probably the best.
>>
>> ><snip> Today while driving I noticed that my vacuum pump was continously
>> >running
>> >when the car was on.
>>
>> This should be a simple fix, as it has to be one of the following things:
>>
>> 1) pump pressure switch failure (vacuum is high enough but the switch 
>> won't
>> turn off) or
>>
>> 2) vacuum leak (vacuum can't get high enough). or
>>
>> 3) pump is dying so can't get the vacuum high enough to turn the switch 
>> off.
>>
>> If you have a vacuum gauge as part of your system then have a look - 
>> brake
>> vacuum in the range of -80 to -95kPa, (approx = -600 to -710mm mercury,
>> approx = -23 to -27.5 inches mercury, should be adequate to turn the 
>> switch
>> off. If you don't have a vacuum gauge it gets a lot harder to tell what 
>> is
>> going on, as your vacuum can be down by half before you notice the added
>> braking pedal effort needed.
>>
>> Find your vacuum pump (simple, since it is running) and follow its' 
>> supply
>> wiring until you find a 'gadget' that has a tube/pipe/hose attached as 
>> well
>> as the wiring. Follow the vacuum tube/pipe/hose to the vaccum system (you
>> should have some kind of vacuum tank, but maybe not) looking for kinks,
>> loose connections etc. If all looks well, I suggest getting a small 
>> mallet
>> (large screwdriver handle will substitute) and give the vacuum switch a
>> sharp tap (or two in different directions), and see if it turns off, if 
>> it
>> does then it was welded shut.
>>
>> Whatever happens, please post a description of pump and switch (posting
>> photos somewhere on-line and providing a link is an excelent way to help)
>> and we will see what we can do to point you or your mechanic in the right
>> direction to both fix the problem and make sure it is unlikely to come
>> back. Brakes are too important to not have working right.
>>
>> Regards
>>
>> [Technik] James
>>
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>
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