HELP!! carb problem
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Senior User
Joined: Mar 2004
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From: brookings, sd
HELP!! carb problem
i just put a 750 holley on my 410 this spring, and it ran great. then today it started this hesitating thing. it will sit and idle fine, and if you slowly give er the gas it runs fine, but if you snap open the throttle quickly it hesitats for a long time then all the sudden wraps hard and fast. the accelorator pump was stuck so i took that off cleaned it up and it now works, but still the same problem. im not much up on carbs so deal w/ me on this part. when you look down the front two barrels there is a small tower that squirts fuel into the throttle body when the throttle is opened. these have nothing comin out of em. what would cause this? any help would be great. this carb is now on my daily driver and i need it. thanks guys
Post Fiend
Joined: Jan 2003
Posts: 8,600
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From: Iowa
Just a few ideas...
Was the spring re-installed?
Is the accelerator pump diaphram torn?
Is the little pushrod thing (hey I dont know the correct term...) that pushes down said diaphram connected right?
Is the check ball present and does it have the correct spacing between it and the retaining strap?
Was the spring re-installed?
Is the accelerator pump diaphram torn?
Is the little pushrod thing (hey I dont know the correct term...) that pushes down said diaphram connected right?
Is the check ball present and does it have the correct spacing between it and the retaining strap?
Posting Guru
Joined: Aug 2001
Posts: 2,117
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From: Evanston, WY
You have to have fuel squirting into the venturis when you operate the throttle linkage. This fuel is provided by the accelerator pump. Check to see that the pump (on the bottom of the float bowl) is being actuated. If not, find out why. If so, then it may be a torn diaphram.
-Scouder
-Scouder
FE "Freakin Expensive"
Joined: Dec 2003
Posts: 6,461
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From: Smith Mountain Lake, VA
Well as said above, Check your pump and the pump arm...and if you have had it sneeze back thru the carb lately,double check your power Valve,that threads into your metering block... That about all I can think of off hand,
And there's nothing the matter with running Holleys on you daily driver..Everything at my house has a Holley carb on it....accept 2 and there EFI.. Good Luck!!
Russ
And there's nothing the matter with running Holleys on you daily driver..Everything at my house has a Holley carb on it....accept 2 and there EFI.. Good Luck!!
Russ
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Joined: Mar 2004
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From: brookings, sd
okay i think i got it figured out last nite. i can never sleep when things like this happen so i spent all night in the shop workin this out. i started at the accelrator pump, and found that it was not funtioning. i took it off and all looked fine inside. put it back on and it worked for little while then was stuck again. it would build pressure then not work. so i pulled the foat bowl cleaned the passages for the pump and still wouldnt work. so i pulled off the venturis (i think) and there is a needle looking rod that was stuck down and not leting the fuel through. it runs like a champ now. thanks for the help
FTE Leadership Emeritus
Joined: Jul 2002
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From: Long Island USA
Originally Posted by RapidRuss
And there's nothing the matter with running Holleys on you daily driver..Everything at my house has a Holley carb on it....accept 2 and there EFI.. Good Luck!!
Russ
Russ
As to the accelerator pump not working, that little pointed rod is basically a one-way valve so the accel pump doesn't suck air back in through the shooters. Glad you found the problem!
art k.
