<VV> Re: Time to Replace pump

[Frank DuVal]

If you think pipe sealant is going to electrically isolate the switch, 
then don't use it. But in all my years of using pipe sealant on the 
threads of oil pressure switches, none have ever not grounded properly. 
The light lights with key on engine off just fine. I also use pipe 
sealant on water temperature senders (they also ground through the 
threads). Oxygen sensors and spark plugs (in aluminum heads) get a small 
ammount of anti seize.

Some oil pressure switches come with pipe sealant already on the threads.

Frank DuVal

Harry Yarnell wrote:

> 'pipe sealant' on the oil press. switch is contrindicated. The thread 
> there need to make electrical contact.
>
> Harry Yarnell
> Perryman Garage and Orphanage
> hyarnell1 at earthlink.net
> ----- Original Message ----- From: "Frank DuVal" <corvairduval at cox.net>
> To: "Tony Underwood" <tonyu at roava.net>
> Cc: <virtualvairs at corvair.org>
> Sent: Saturday, May 06, 2006 6:08 PM
> Subject: Re: <VV> Re: Time to Replace pump
>
>
>> Brass to brass is usually soft enough to deform and seal without any 
>> additional help. The steel nipple on the fuel pump may need some 
>> help, but the soft material it screws into may also deform to seal, 
>> as you have proven in actual use!
>>
>> Teflon tape must be used carefully, especially the leaving the first 
>> thread bare, same as any pipe dope, or pieces will find their way 
>> down stream. It can also lubricate the fitting and allow female 
>> tapered threads to tighten easily enough to split when wrenched with 
>> strong hands.
>>
>> Flare fitting should never need any additional sealing material. If 
>> they do, something is cracked, broken or worn out. So this nipple and 
>> the oil pressure switch are about the only places on a Corvair one 
>> could use pipe sealant. But it is not required.
>>
>> And no, I do not wear a belt with suspenders, just plumb that way.
>>
>> Frank DuVal
>
>