cold start requires pumping gas pedal?
#1
cold start requires pumping gas pedal?
Hey guys,
I just joined this board today to hopefully get some answers. Father-n-law sold me an 86 Z28 w/305 carb for $500. for a cold start, i have to pat the gas pedal about 30+ times to get it running. After that it starts right up fine. Seems its loosing vacuum? Thanks ahead of time for the help.
I just joined this board today to hopefully get some answers. Father-n-law sold me an 86 Z28 w/305 carb for $500. for a cold start, i have to pat the gas pedal about 30+ times to get it running. After that it starts right up fine. Seems its loosing vacuum? Thanks ahead of time for the help.
#2
Supreme Member
iTrader: (1)
Join Date: Apr 2000
Location: Northern CA.
Posts: 5,321
Likes: 0
Received 4 Likes
on
4 Posts
Car: '82 Z28
Engine: 350
Transmission: TH400 4,000 stall
Axle/Gears: Currie 9", 4.56 gears
Re: cold start requires pumping gas pedal?
Should only take one or two pumps at most. If you haven't tried starting it today, go out there, take the air filter housing off, pull back the choke blade so you can have a look down the small primary boosters of the carb. Work the throttle and see if any gas is shooting out, if there was, go ahead and try to start it without pumping the gas any more. If nothing is coming out then the gas is draining back out of the carb or the gas is just evaporating out of the fuel bowl.
#3
Re: cold start requires pumping gas pedal?
Is the choke setting? In other words, does the flapper above the primaries snap shut when you fist pump the gas? If it doesn't, that's most likely your problem along with the possibility of what EvilCartman says about the gas leaking out of the carb overnight ( leaky well plugs ).
#4
Supreme Member
Join Date: Feb 2010
Location: Orlando
Posts: 1,446
Likes: 0
Received 2 Likes
on
2 Posts
Car: 1991 Camaro Z28
Engine: 357, Canfield heads, solid roller,
Transmission: Upgraded 03 Cobra T56
Axle/Gears: 9" 3.50 gears and Detroit Locker
Re: cold start requires pumping gas pedal?
With the warmer weather here now, I doubt its anything to do with a choke. I have a Mighty Demon carb, theres not even a place to mount a choke, and even with my motor built like it is, 1 pump of the gas pedal and it fires right up. Does the same even if it gets into the 30's. The choke will let it run when cold without having to hold the gas down, but shouldnt stop it from firing up.
#5
Supreme Member
iTrader: (1)
Join Date: Apr 2000
Location: Northern CA.
Posts: 5,321
Likes: 0
Received 4 Likes
on
4 Posts
Car: '82 Z28
Engine: 350
Transmission: TH400 4,000 stall
Axle/Gears: Currie 9", 4.56 gears
Re: cold start requires pumping gas pedal?
I've found that q-jets need a choke even when warmer weather is around, or at least the one on my other car does. Like yours, my race Demon will start up in cold weather without much trouble.
Thread
Thread Starter
Forum
Replies
Last Post