| Re: [GMCnet] Anyone have a loose fuel pump? [message #332400] |
Tue, 22 May 2018 10:14  |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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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
>>
>>
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