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06-21-2012, 05:00 PM
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#1 |
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Registered User
Join Date: Jul 2011
Location: Jefferson City, MO
Posts: 12
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400 SB loading up
 I recently built a 409 (400 .040 over) for my 87 c10. I have had numerous problems with it loading up upon first start up. It still has the factory electric fuel pump in it (was throttle body before), Mallory pressure regulator regulating down to about 6 psi at the carb, Holley 770 Street Avenger carb, idled around 1,100 rpm. I usually try to turn the fuel pump and let it run off the bowls for about 10 seconds or so before i shut it off, hoping to ease the problem. I also start it up with the pump turned off, trying to help the loading up as well. Any input would be very helpful.
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06-22-2012, 06:03 PM
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#2 |
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Registered User
Join Date: Mar 2012
Location: stafford springs ct
Posts: 149
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Re: 400 SB loading up
does this happen hot,cold, or both? if it only happens cold check the choke adjustment-it may want less choke. if it happens all the time look down the carb after you shut it off and see if theres fuel dribbling down the boosters.
__________________
1977 srw cc lb 396/700r/4:11's/6'' bds lift/ 35's. sold 1986 suburban 350/700r/3:73's 31's: parted out. 1980 silverado swb 5.3/700r/ 2'' drop/ daily driver. sold 1985 c10 long bed 5.3/700r/2'' drop/17" wheels/ daily driver. sold 1970 c10 long bed-new project! getting ready for the 6.0 |
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06-23-2012, 11:52 AM
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#3 |
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Registered User
Join Date: Jul 2011
Location: Jefferson City, MO
Posts: 12
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Re: 400 SB loading up
It happens worst when it's cold, if youve been driving the truck for awhile and it is warmed up, it will not load up if you start it back up within about 15-20 minutes. if it sits for awhile though it will load back up when started. The carb has an electric choke, I haven't tried making any adjustments to that yet. Thanks.
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