| Re: [GMCnet] Anyone have a loose fuel pump? [message #332400] |
Tue, 22 May 2018 10:14  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Darn spell check. Should be cam lobe, not lube.
Jim Hupy
On Tue, May 22, 2018, 8:12 AM James Hupy wrote:
> There are usually 2 springs in modern mechanical fuel pumps. One whose
> purpose is to keep the operating lever in contact with the cam lube, is
> quite strong. The other spring, which actually presses against the
> diaphragm, is the one that actually pumps the fuel. It has about 3 - 5
> pounds pressure. It is compressed by the movement of the operating lever,
> and relaxes against the diaphragm. If there is an equal pressure against
> the other side of the diaphram, like there would be when the carb needle
> were closed, then that small spring does not move the diaphram and no
> pumping takes place until the float needle opens. So, now you know how the
> mechanical pump regulates fuel pressure.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
>
> On Tue, May 22, 2018, 7:55 AM John R. Lebetski
> wrote:
>
>> Maybe they increased the spring load to keep them from sticking or to
>> keep contact for the "racer" market?
>> --
>> John Lebetski
>> Woodstock, IL
>> 77 Eleganza II
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] Anyone have a loose fuel pump? [message #332403 is a reply to message #332400] |
Tue, 22 May 2018 10:28  |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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Leave "SPELL CHECK" on but turn "AUTO CORRECT" off!
D C "Mac" Macdonald
Amateur Radio K2GKK
Since 30 November '53
USAF and FAA, Retired
Member GMCMI & Classics
Oklahoma City, OK
"The Money Pit"
TZE166V101966
'76 ex-Palm Beach
k2gkk + hotmail dot com
________________________________
From: Gmclist on behalf of James Hupy
Sent: Tuesday, May 22, 2018 10:14
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Anyone have a loose fuel pump?
Darn spell check. Should be cam lobe, not lube.
Jim Hupy
On Tue, May 22, 2018, 8:12 AM James Hupy wrote:
> There are usually 2 springs in modern mechanical fuel pumps. One whose
> purpose is to keep the operating lever in contact with the cam lube, is
> quite strong. The other spring, which actually presses against the
> diaphragm, is the one that actually pumps the fuel. It has about 3 - 5
> pounds pressure. It is compressed by the movement of the operating lever,
> and relaxes against the diaphragm. If there is an equal pressure against
> the other side of the diaphram, like there would be when the carb needle
> were closed, then that small spring does not move the diaphram and no
> pumping takes place until the float needle opens. So, now you know how the
> mechanical pump regulates fuel pressure.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
>
> On Tue, May 22, 2018, 7:55 AM John R. Lebetski
> wrote:
>
>> Maybe they increased the spring load to keep them from sticking or to
>> keep contact for the "racer" market?
>> --
>> John Lebetski
>> Woodstock, IL
>> 77 Eleganza II
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Flist.gmcnet.org%2Fmailman%2Flistinfo%2Fgmclist_list.gmcnet.org&data=02%7C01%7C%7C 6a366e927d5140e03d5208d5bff6cb2e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636625989041435149&sdata=BbFTRtMwKlQQtpQtioXeMa37CMi90f2IVA919FNnC2w %3D&reserved=0
>>
>
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