Re: 318 stunble
[Re: '84 D150 Shorty]
#684169
04/30/10 12:28 AM
04/30/10 12:28 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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check for an immediate squirt of gas when you move the throttle & I'm assuming it's warmed up/choke off as inadequate choke closing can do it
live every 24 hour block of time like it's your last day on earth
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Re: 318 stunble
[Re: RapidRobert]
#684170
04/30/10 12:39 AM
04/30/10 12:39 AM
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Joined: Sep 2007
Posts: 738 TN
'84 D150 Shorty
OP
Pickup Man
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OP
Pickup Man
Joined: Sep 2007
Posts: 738
TN
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Quote:
check for an immediate squirt of gas when you move the throttle & I'm assuming it's warmed up/choke off as inadequate choke closing can do it
k, i just checked that, and didnt see gas squirting in. a little bit of fuel is going, but i should be able to see a visible squirt of fuel goin in right? if so, what would cause that?
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Re: 318 stunble
[Re: '84 D150 Shorty]
#684171
04/30/10 12:42 AM
04/30/10 12:42 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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take the top off and check the acclerator plunger neoprene cup for rips/tears & if good check the float level (good idea anyway as it's easy and you have the top off)
live every 24 hour block of time like it's your last day on earth
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Re: 318 stunble
[Re: '84 D150 Shorty]
#684175
04/30/10 02:42 AM
04/30/10 02:42 AM
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Joined: Mar 2010
Posts: 357 Lake Elmo, MN
Evil Monkey
enthusiast
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enthusiast
Joined: Mar 2010
Posts: 357
Lake Elmo, MN
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I'm no carburetor expert, but here's my thoughts. With no visible fuel squirt when you hit the accelerator, that means your accelerator pump is not working properly. Running with the choke partially closed will give you more fuel, so the accelerator pump issue will not be noticeable - you're covering up the lack of an accelerator pump squirt by introducing more fuel into the system with the choke. So, we need to determine why your accelerator pump is not squirting.
On my Holley, when you hit the accelerator, the accelerator pump cam pushes on a lever, which then pushes on the accelerator pump diaphram, which forces fuel through a passage and out of the squirter. A spring inside the accelerator pump bowl forces the diaphram back when the accelerator goes back to idle position. If the lever is sticking, the diaphram will not return, and the accelerator pump cam can move all it wants but it won't be moving the lever (since it's stuck), and you won't get a squirt. The same thing would probably happen if the spring behind the diaphram was broken - it wouldn't return the diaphram, and you would get no squirt. You may also have a plugged passage to the squirter, or a plugged squirter, or even a wiped lobe on the accelerator pump cam.
The way your carb creates the squirt may be different, but the principles should be the same - something pushes on the diaphram, causing fuel to flow through and out of the squirter. If the diaphram isn't being pushed, or it isn't returning, or the system is plugged, you won't get a squirt.
1974 'Cuda 360/TKO
1990 Ram Van
1998 Neon
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Re: 318 stunble
[Re: 451Mopar]
#684177
04/30/10 06:56 AM
04/30/10 06:56 AM
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Joined: Jan 2003
Posts: 16,123 Grand Haven, MI
patrick
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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what kind of carb?
if it's an edelbrock/carter, you can change the position of the linkage to a hole closer to the body of the carb, that'll give a larger pump shot, if the accelerator pump is working correctly. you should see a solid squirt when snapping the throttle.
1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!*** 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: 318 stunble
[Re: '84 D150 Shorty]
#684181
04/30/10 05:50 PM
04/30/10 05:50 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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might take off the squirter & see if the brass valve is loose and move the throttle and see if it squirts and if not then I think the carb needs to come off to get at the AP diaphram under the square cover. I'm assuming that the external linkage is intact/moving, that it's something inside
live every 24 hour block of time like it's your last day on earth
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Re: 318 stunble
[Re: '84 D150 Shorty]
#684183
05/01/10 11:08 AM
05/01/10 11:08 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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What was in there a ball or the pointed needle. I'm not a holley guy and one I have has just the needle
live every 24 hour block of time like it's your last day on earth
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Re: 318 stunble
[Re: RapidRobert]
#684184
05/01/10 10:40 PM
05/01/10 10:40 PM
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Joined: Sep 2007
Posts: 738 TN
'84 D150 Shorty
OP
Pickup Man
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OP
Pickup Man
Joined: Sep 2007
Posts: 738
TN
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Quote:
What was in there a ball or the pointed needle. I'm not a holley guy and one I have has just the needle
it was a ball bearing type with a small weight above it. The bearing seals the opening, with the weight on top, in a bore located beneath the fuel nozzles
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