hey guys, had my car out for the first time today. let the engine warm up and drove to the road. lite it up on the road and when I let out of it, it backfired and almost stalled. had trouble keeping it running to get back to the shop. once I shut it off, I couldn't get it going again until I held the pedal to the floor (flooded). once it was running again all you could smell was gas, it doesn't sound like it has a bad miss or anything? any ideas what happened? bad plug maybe? I checked the headers with a heat gun, all cyl's were pretty consistent. # 2 cyl was the coolest, but only 20 degrees less then the others.

 

Check the float level and see if it is pumping to much fuel in to the Carb... Check choke..

 

I think the f/p, pumped to much fuel into the carb, the inline gauge has been spiked...

 

Did the back fire blow out your blow out valve?

 

hey guys can you clear some things up for me...(not a carb guy Im a diesel engine tech)... if fuel pressure is to high, im assuming over 4-7psi then it has the possibility of unseating the float check valve and flooding the engine? And what regulates fuel pressure? does the pump (mechanical) have a check valve internally? im pretty sure the fuel pump is putting out like 14-15psi, im going to check tomorrow with a gauge, can I dead head this little mechanical fuel pump? And im sorry smee78 im not sure where or what a blow out valve is?

 

Smee is referring to a power valve, which can be negatively affected by a backfire and make it run way rich. That would be if you have a Holley carb, Edelbrock and Quadrajets have metering rods.
About your fuel pressure, if you are in fact spiking your pressure gauge, then the needle and seat won't hold it back and the fuel bowl will flood over. How many psi on the gauge is "spiked" by the way? There is nothing in a conventional mechanical or electrical fuel pump setup that regulates pressure, unless you have one with a self-contained pressure regulator, or a separate regulator after the pump, either with or without a return line to the tank. If your psi is 14-15 as you're suspecting, then that is one of, or is your only problem. You want to dial pressure back to be no more than 6 psi, your carb is fighting a losing battle otherwise.

 

hey guys... what I found was one of the weights under the rotor had broke and cracked the rotor, putting the timing way off....