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C1 & C2 Corvette Open Discussion General and technical C1 & C2 Corvette discussion - ownership, maintenance, repairs, modifications, restoration |
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#1 | ||||||
Vette Barn nOOb
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My 65 300hp just started flooding when shut down for a few minutes. Clears up a few seconds after restart but something is wrong. Never had issue before. Any ideas?
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#2 | ||||||
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When you say flooding, do you mean that you have to hold the accelerator pedal down in order to restart it after it’s warm? If so, it sounds like fuel percolation to me. This comes from the ethanol and the gas today and there’s really nothing you can do about it. The best thing to do is to hold the accelerator pedal about 3/4 of the way down to get it to start and then you may have to read it a little to keep it running before it clears up. This is far more common in the summer with the summer blend of ethanol.
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Previous screen name on Corvette Forum was 68hemi See my albums by clicking on my screen name for info and pictures of my cars. My vehicles are driven DAILY 1965 Rally red/black leather coupe with stealth 383 appears like a factory 365 h.p. engine 1966 Nassau blue/blue L72 convertible 1972 El Camino SS Silver/black 2011 Polaris RZR 900 |
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#3 | ||||||
Vette Barn nOOb
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Do you mean the fuel is seeping into the cylinders when it's shut down?
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#4 | ||||||
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No. Percolation is when the fuel percolates in the carburetor from the heat after you shut it off. When it percolates it causes this problem of starting.
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Previous screen name on Corvette Forum was 68hemi See my albums by clicking on my screen name for info and pictures of my cars. My vehicles are driven DAILY 1965 Rally red/black leather coupe with stealth 383 appears like a factory 365 h.p. engine 1966 Nassau blue/blue L72 convertible 1972 El Camino SS Silver/black 2011 Polaris RZR 900 |
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#5 | ||||||
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If it is peculating some guys put a spacer between the carb and intake.
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Rebuild the carburetor.
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That won’t cure the percolation problem. It’s just a problem of our times with this ethanol fuel.
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Previous screen name on Corvette Forum was 68hemi See my albums by clicking on my screen name for info and pictures of my cars. My vehicles are driven DAILY 1965 Rally red/black leather coupe with stealth 383 appears like a factory 365 h.p. engine 1966 Nassau blue/blue L72 convertible 1972 El Camino SS Silver/black 2011 Polaris RZR 900 |
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#9 | ||||||
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That’s great if it’s available to you. In my town, there’s one station that has it and it’s more expensive than premium. In the summer of2018 when I did a route 66 road trip from Chicago to California I had a lot of problems with percolations on the trip until I got to Oklahoma, where I was able to buy non ethanol, gas there and through Texas. As soon as it was not available again. The problem started right back up. That was in my 65 which did not have any type of thermal barrier between the intake in the carb. I did more than half the trip with the 65 but when I reached Arizona I switched to my 57 that I had at the time that had dual quads on it with thermal barriers on both carbs, but it didn’t seem to make much difference.
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Seems all the newer fuels percolate or dry up and require extended starter run time with the old carbs, at least my cars and my area (OKC).
I always buy non-ethanol fuel, but if the car sits for more than a few days, both the 62 (AFB) and the 66 (Holley) require additional starter time to get fuel to the carb and then start up. Once I go past 3-4 weeks, the 62 can take 4-5, five second bursts of the starter and then it starts and runs smooth. The 66 can take 3 bursts. Both carbs are good with recent OH's and no running or idling issues. I don't remember this problem back in the day, but back in the day my cars were driven daily or every other day. Maybe fuel always percolated away and I just never realized it. |
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Question: Is it better to up the octane in the non ethanol with an additive? or use an additive to offset the ethanol in the premium? |
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Depends on the octane rating of the base fuel that you’re using whether it’s ethanol or non-ethanol fuel. If you need to up the octane start with the highest octane rating, regardless of whether it’s ethanol or non-ethanol.
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#14 | ||||||
Vette Barn nOOb
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Guys- thanks for all the comments but I probably did not describe my problem correctly. When I restart, the engine spins over very quickly like a flooded one does. When it fires off it sputters and gags like a flooded engine. I clear it up with a good rev and the exhaust having a heavy raw gas smell. Checked choke and needle/float assemblies. All OK. That is a better description of the symptoms.
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#15 | ||||||
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A little more information needed from you.
1. Is this happening after the engine is hot and has been driven some for some time? If so, how long does it sit before you have this problem starting? 2. If it doesn’t have anything to do with the engine temperature, then I would check to see if your needle and seat is working properly and if not, it’s allowing fuel to seep into the intake manifold was causing this problem. 3. If it is after it’s hot and will not start after refueling at a gas station (This Scenario is used as an amount of time) Then I still think your problem is percolation. A better explanation of percolation would be that the gas expands and bubbles after shut down which of course changes the air fuel ratio that’s sitting in the carburetor when you try and restart it. So in order to start the car, you need to hold the accelerator either 3/4 of the way or all the way down until it starts and clears itself. You usually have to rev The engine to keep it running until it clears.
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Previous screen name on Corvette Forum was 68hemi See my albums by clicking on my screen name for info and pictures of my cars. My vehicles are driven DAILY 1965 Rally red/black leather coupe with stealth 383 appears like a factory 365 h.p. engine 1966 Nassau blue/blue L72 convertible 1972 El Camino SS Silver/black 2011 Polaris RZR 900 |
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