awarrenj

Hi All, I am having a problem with my 427/435 starting after sitting for 5-6 days. There seems to be no gas to carbs until a number of pumps and then it fires up and runs , no problem. If it sits overnight or maybe 2 days it fires right up.
Would appreciate any thoughts about this problem, thanks.

Tiger Joe

That’s sounds pretty normal to me. My tri power starts with 1 pump to set the choke for a few days, but once I start pushing sitting for a week I need to crank it over a bit get some fuel in the bowls.

dcamick

That is my "Normal" also!

dplotkin

How old are you?
If you grew up in the 80's when fuel injection replaced most carburettors you might not be aware that in the olden days, days of yore, old fashioned times, before Facebook (B.F.) drivers actually had to nurse a cold engine to life if it sat a long time or was cold out. Sometimes several pumps and crank attempts would be necessary to start a cold engine. And if it started we might have to sit there a minute or two and feather the throttle to keep it running until the manifold warmed up enough to keep the fuel vaporized.

We thought about this before using the car to rob a bank.

Not unlike gathering wood for the dinner fire, or shooting breakfast, it was hard work and didn't always happen on the first try.

Dan

DansYellow66

Get one of these and fill with lawnmower can gas and squirt some in the center carb bowl vent and a little in the carb throat. Pump the throttle 3 times and start the engine. I fill the bowl in my car until it begins to drip out of the boosters but if you squirt a little down the throat that probably is not necessary.

Lotsacubes

Normal. My start ritual is spin for about 6-8 seconds twice to see oil pressure. That refills carb and lubes. Then pump maybe 3 times to squirt into manifold. Then here’s the key for me….. do nothing for about another 6-8 seconds to allow that fuel in the manifold to vaporize. Then crank again. Prematurely expecting it to bark with no fuel in carbs is useless so I use that time without combustion pressures to lube the engine. Usually when my L72 starts to bark, I have at least 30-50 psi on the gage. The vaporization pause is the key for me. My pre-lube procedure is from my aviation background. Early on this drove me nuts. BTW, I only use high test non-ethanol. Yep. Normal. I’ve come to enjoy this non-fuel injected, old time ritual. Larry

66427-450

Yup, you don’t have a “problem” , you have a 67 427 Corvette, be thankful nobody’s chopped it up/added incorrect-aftermarket crap …. enjoy the experience

awarrenj

Thanks everyone , seems I don't have a problem, just a great engine.. had one of these years agon and didn't remember the issue but then again it was my daily driver.
Thanks again

rongold

And the gas was a lot different back then. Totally normal !!!

dplotkin

I'm glad you mentioned this, it is a very important thing to do. You've got to let those Vapors coalesce and get happy inside the intake.

Dan