starting issues
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Posting Guru
Joined: Nov 2011
Posts: 1,302
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From: Burlington, WI
starting issues
Ok guys i've been having this issue for awhile now and I cant figure out whats going on. When the truck is left to sit for any more than 30 minutes it has a hard time starting. It cranks and cranks and cranks and cranks (acts as if it has no gas). Then it will finally fire and idle at 100 rpms and die unless i feed it gas. It then will begin to even out after a minute and will fast idle at 1600 rpms like normal. When the truck is hot after Ive been driving it, if I shut it off to run into a store then come out to go home, the truck will restart just fine (turn the key and it starts and runs).
To me, this sounds like fuel draining out of the carb when the truck is left to sit...on cold starts, Ive tried double pumping the pedal, not touching the pedal, holding the pedal 1/3 of the way down, and finally, holding the pedal on the floor. The only option that sometimes works is holding the pedal to the floor...
why is this happening? I will try to take a video of how it sounds and post it here.
To me, this sounds like fuel draining out of the carb when the truck is left to sit...on cold starts, Ive tried double pumping the pedal, not touching the pedal, holding the pedal 1/3 of the way down, and finally, holding the pedal on the floor. The only option that sometimes works is holding the pedal to the floor...
why is this happening? I will try to take a video of how it sounds and post it here.
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
It could be "fuel percolation" where fuel literally boils out of the carburetor. This does two things, the fuel bowl is now empty and the fuel has puddled into the intake manifold, flooding the engine.
One fix would be to put a phenolic spacer between the carb and manifold. This will help insulate the carb from the heat.
One fix would be to put a phenolic spacer between the carb and manifold. This will help insulate the carb from the heat.
Cargo Master
Joined: Apr 2009
Posts: 3,038
Likes: 4
From: South west Idaho
I have two engines that do that and they have edelbrock carbs. I have been told Edelbrocks will do that if they are getting worn pretty bad even after carb kits have been put in. Both of mine are old carbs , late 80s i think . I think the fuel does drain back, not sure ? I have been thinking about getting a least one new one. If you have another brand i can't suggest any thing .
Cargo Master
Joined: Apr 2009
Posts: 3,038
Likes: 4
From: South west Idaho
It could be "fuel percolation" where fuel literally boils out of the carburetor. This does two things, the fuel bowl is now empty and the fuel has puddled into the intake manifold, flooding the engine.
One fix would be to put a phenolic spacer between the carb and manifold. This will help insulate the carb from the heat.
One fix would be to put a phenolic spacer between the carb and manifold. This will help insulate the carb from the heat.
I tried that once and it never helped. Mine never smells flooded and it only happens after sitting a couple of weeks or longer. I pump the gas pedal about 6 or 8 times and it starts right up and one of them ,the chevy, has no choke. But the chevy does have an electric fuel pump.
Laughing Gas
Joined: May 2006
Posts: 1,140
Likes: 13
From: Port Orchard Wa
I had a similar problem with a 73 with 390 2bbl. The problem was worse when it was hot outside. My guess was the same as Mike0O's, so I put in a remanuf carb and that fixed the problem. I don't know if doing a rebuild kit would have fixed the problem or not.
I also had the hard cold start problem, especially after the truck sat for a few days. That problem was not fixed with the carb replacement. I would pump it 8 times, turn it over, pump it another 8 times, turn it over. It would usually fire and run fine after 2 to 3 cycles of this.
I also had the hard cold start problem, especially after the truck sat for a few days. That problem was not fixed with the carb replacement. I would pump it 8 times, turn it over, pump it another 8 times, turn it over. It would usually fire and run fine after 2 to 3 cycles of this.
Thread Starter
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Posting Guru
Joined: Nov 2011
Posts: 1,302
Likes: 5
From: Burlington, WI
I did forget to add that I do have a 1/2" spacer underneath the carb as well. However, I do see that my crappily blocked off egr plate is leaking so I'm considering just taking off the egr plate and running with just the 1/2" base gasket and the 1/2" spacer.
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