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Re: [GMCnet] Carb fuel filters [message #327210 is a reply to message #327209] Sun, 17 December 2017 12:55 Go to previous messageGo to previous message
James Hupy is currently offline  James Hupy   United States
Messages: 6806
Registered: May 2010
Karma:
Senior Member
I'm with Rick on this one. The check valve allows fuel to enter the carb,
and prevents back flow. Of no issue, really, because Quadrajet carbs on
Olds engines with active exhaust crossovers will boil off todays fuel in
the float chamber upon shut down. That, except for the amount that doesn't
leak out the bottom through the leaky BB shot plugs, in the bottom of the
float chamber. California equipped coaches have another (2) charcoal
canister plumbed into the Carb bowl vent to reclaim this venting. Lots more
hoses for little gain.
Jim Hupy
Salem, Or
78 GMC Royale 403 (49 state emissions equipped)

On Sun, Dec 17, 2017 at 10:39 AM, Richard Denney wrote:

> I think the idea behind the check valve is to keep the carb from draining
> back into the tank when the engine is off. I just can't imagine that it's
> needed in our application--doesn't the mechanical pump already have a check
> valve?
>
> I've bypassed both the carb filter and the mechanical pump, but I have an
> electric pump that gets fuel to the carb when the ignition is on.
>
> Rick "wondering if the change was driven by another application" Denney
>
> On Sun, Dec 17, 2017 at 1:06 PM Scott Nutter
> wrote:
>
>> Still waiting for a answer on check valve/flapper vs non check
>> valve/flapper carb filters on the advantages. Or maybe I missed it in a
>> post?
>> Thanks, Scott.
>> --
>> Scott Nutter
>> 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21
> final
>> drive, Quad bags, tankless water heater, everything Lenzi.
>> Houston, Texas
>>
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> --
> Rick Denney
> 73 x-Glacier 230 "Jaws"
> Off-list email to rick at rickdenney dot com
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