heard this one yet???? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Steeveedee** · 08-02-2018, 04:07 PM

It sounds like you have a stumble when you opened the throttle. I'd take a look at the pump squirt (truck not running) when partially opening the throttle. That is either a low float level (which you checked as good) or the linkage needs adjusting to get the slack out. The pump should move and squirt right when you open the throttle.

stevenfromtexas · 08-02-2018, 04:17 PM

Quote:

Originally Posted by Steeveedee

It sounds like you have a stumble when you opened the throttle. I'd take a look at the pump squirt (truck not running) when partially opening the throttle. That is either a low float level (which you checked as good) or the linkage needs adjusting to get the slack out. The pump should move and squirt right when you open the throttle.

ok...i'll look now. "squirt", like a water pistol?

stevenfromtexas · 08-02-2018, 04:44 PM

...its more like a water fountain thats my best description. looks like ill be redoing the accelerator pump cup again

stevenfromtexas · 08-02-2018, 04:55 PM

hate to keep buggin' y'all.....forgive my ignorance.

a little single barrel theory101

if i understand correctly, the "power" valve (long brass spool looking valve) pulls down with vacuum.
as you accelerate, you lose vacuum and that valve gets pushed back up with a spring.
the top of that valve then opens a check ball and allows more fuel.
my valve moves freely when i cleaned everything up yesterday

could the stumbling with a small amount of throttle be in that circuit also?
i'll prolly get a new fuel pump too per Metaldoc's recommendation.

08-02-2018, 04:07 PM	#1
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,990	Re: heard this one yet???? It sounds like you have a stumble when you opened the throttle. I'd take a look at the pump squirt (truck not running) when partially opening the throttle. That is either a low float level (which you checked as good) or the linkage needs adjusting to get the slack out. The pump should move and squirt right when you open the throttle. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

08-02-2018, 04:44 PM	#3
stevenfromtexas Registered User Join Date: Mar 2013 Location: Hewitt, Texas Posts: 444	Re: heard this one yet???? ...its more like a water fountain thats my best description. looks like ill be redoing the accelerator pump cup again __________________ Steven '67 SWB, 250ci, 3OTT.......this is my first build...... I wonder if my grand kids will say, "I would give anything to have my grand dads 2005 Chevrolet Z71"

08-02-2018, 04:55 PM	#4
stevenfromtexas Registered User Join Date: Mar 2013 Location: Hewitt, Texas Posts: 444	Re: heard this one yet???? hate to keep buggin' y'all.....forgive my ignorance. a little single barrel theory101 if i understand correctly, the "power" valve (long brass spool looking valve) pulls down with vacuum. as you accelerate, you lose vacuum and that valve gets pushed back up with a spring. the top of that valve then opens a check ball and allows more fuel. my valve moves freely when i cleaned everything up yesterday could the stumbling with a small amount of throttle be in that circuit also? i'll prolly get a new fuel pump too per Metaldoc's recommendation. __________________ Steven '67 SWB, 250ci, 3OTT.......this is my first build...... I wonder if my grand kids will say, "I would give anything to have my grand dads 2005 Chevrolet Z71"



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