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 Intake / Carb and Fuel Delivery Tech
 Hot start
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68bird
Sitting Bull

USA
221 Posts

Posted - 23 May 2016 :  10:21:51 AM  Show Profile  Reply with Quote
Any of you guys ever experience a fuel related hot start issue? I'm having an issue with the new 461 stroker not starting well when up to temp after a short ride. It fires right off when cool, but just cranks and cranks when hot. At first I thought it might have been too much timing, but yesterday when it wouldn't fire i adjusted the distributer both ways and it didn't matter. So last ditch effort I pumped the hell outta the gas and almost had to hold it to the floor before it roared to life. So now I'm thinking fuel related? The primaries are feeding the fuel fine, so I don't think I'm vapor locked in the line. Any ideas? 4 barrel demon 850 with mechanical secondaries and no choke. Thanks

Robb Hermes

tjs44
Cochise

USA
412 Posts

Posted - 23 May 2016 :  10:35:14 AM  Show Profile  Reply with Quote
Sounds like it might be flooding?Tom
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68bird
Sitting Bull

USA
221 Posts

Posted - 23 May 2016 :  10:41:42 AM  Show Profile  Reply with Quote
But wouldn't that be the opposite of what I had to do to get it going?
Thanks

Robb Hermes
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cortcomp
Coyote

USA
5335 Posts

Posted - 23 May 2016 :  11:06:25 AM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
Holding the pedal down to the floor makes me thing flooded...WOT at cranking, other than the burst of fuel from the accel pump to get the pedal down, doesn't draw much fuel in but it lets a ton more air in, kind of leans it out, and allows fresh air to pump through the motor. Sure, you'll have that raw fuel on the intake floor for a few seconds.

Wonder if you're having an issues where the carb is somehow leaking fuel into the engine when it's shut off, leaving you slightly flooded before you even try to restart it hot?
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tjs44
Cochise

USA
412 Posts

Posted - 23 May 2016 :  3:01:29 PM  Show Profile  Reply with Quote
I have a tripower from time to time leaks fuel from the center carb.No friggin idea why and same deal,have to hold the pedal down to get it to fire.Tom
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68bird
Sitting Bull

USA
221 Posts

Posted - 23 May 2016 :  5:29:25 PM  Show Profile  Reply with Quote
So my plan of attack should be to drive it, pull the air cleaner and watch it for fuel leakage? Thanks again, Robb

Robb Hermes
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68bird
Sitting Bull

USA
221 Posts

Posted - 23 May 2016 :  5:46:48 PM  Show Profile  Reply with Quote
Or try a different carb that is known to be in good working condition?

Robb Hermes
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Blued and Painted
Chief PONTIAC

USA
3406 Posts

Posted - 24 May 2016 :  11:07:09 AM  Show Profile  Reply with Quote
After shut down and heat soak, listen for fuel boiling in the fuel bowls. This will flood the engine and empty the carb. A double whammy.

If it has a functional heat crossover intake, many use insulating spacers or heat shields under holley style carbs.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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68bird
Sitting Bull

USA
221 Posts

Posted - 25 May 2016 :  07:15:34 AM  Show Profile  Reply with Quote
Thanks guys. I may try a insulating spacer

Robb Hermes
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