Hey guys, hoping some can provide some guidance for me.
Have a 5 month old backdraft, with a Smeding 427, quick fuel 750 double pumper and mechanical fuel pump. Having big time cold start issues, I'll try to document them below.
1) here's what I've confirmed, when I park the car for more than 2 days the fuel in the bowls (visible through windows) evaporates. I know it's not leaking because I've sent in an
oil sample for analysis and there is no fuel in the
oil. If I park after a hard drive I can actually see the fuel percolate out within 30 minutes. But it will still start hot without issue.
2) now after a couple of days the bowls are dry. I crank the engine for 5 seconds and notice the bowls fill up.
3) I give it 1-2 pedal pumps, gas jets nicely in the carb, choke closes and car fires up nice and strong. Then 2 seconds later starts to stumble and stalls after 3-4 seconds.
4) I wait 30-60 seconds and crank for 10 seconds and it won't start.
5). Wait another 30-60 seconds and give it a full pedal shot again and this time it fires up strong and a big cloud of gray smoke from the pipes like its flooded and the engine stumbles like its flooded. Get out and smell the pipes, there's strong gas smell and gray vapor from pipes. Definitely seems flooded.
6). Wait 3 minutes, push pedal to the floor and hold it, fire it up and again starts strong with a big gray cloud, RPMs struggle around 600-800 as the car works through the gas and after 1 minute the RPMs stabilize at 1400 rpm and car runs great thereafter.
So why is the engine flooding after the first start? This doesn't happen during hot starts and won't happen if I drive the car every day. Only after sitting for more than 2-3 days.
Frustrated!
Art
427 dart block with 750 quick fuel, cold start trouble
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