why is it that i need to hold down the gas pedal to start my engine - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-10-2013, 09:38 PM
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why is it that i need to hold down the gas pedal to start my engine

350 chevy, 600 cfm edelbrock 1405 carb, xe 274h comp cam, performer eps manifold, one inch open spacer, short tube headers

is it the carb spacer ? could i be running rich ?

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Old 05-10-2013, 10:13 PM
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If you are holding it open, it is looking for air. Give more details - when do you need to do this (cold, hot etc)
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Old 05-10-2013, 10:20 PM
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Quote:
Originally Posted by 33Willys77 View Post
If you are holding it open, it is looking for air. Give more details - when do you need to do this (cold, hot etc)
usually when the engine is warm, doesn't need to be hot

I've tuned it as best I could for max vaccum and it really doesn't like having an air cleaner on it, runs much better without it

i just put a fuel regulator today, i've got 5psi of fuel to the carb now

still nothing
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Old 05-10-2013, 10:37 PM
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THE CARBURETOR SHOP / Troubleshooting


Difficult starting of a hot vehicle from 5 minutes to an hour after the engine has been operated, can be caused by the volatility of modern fuel. If you have this problem; try using the following method to start the engine: DON’T touch the footfeed (VERY important). Crank the engine over from three to 5 seconds (different vehicles will respond to different times); and then GENTLY (so as not to activate the accelerator pump) press the footfeed approximately 1/3 of its travel. The engine should start, and may run rough. Run the engine at a high idle for about 10 seconds. This issue is caused by volatility of modern fuel. Once the engine has been shut off, the gasoline is heated by the latent heat of the engine, and percolates the fuel from the bowl into the throttle area, forming a mixture that is too rich to fire. If you push the footfeed to the floor (as has been the traditional method of “unloading” a flooded engine) the gasoline continues to flow into the engine (again due to the volatility). By not touching the footfeed, you do not open the throttle plates, and the engine will pump the overrich mixture out of the tailpipe. Once the overrich mixture has been alleviated, gently opening the throttle will allow the engine to start.
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Old 05-10-2013, 10:49 PM
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I think the carb may be getting too warm and in doing so, when you shut it off, the extra heat coming up from the motor can 'push' some fuel into the intake - just like Landshark has posted. What do you have for an aircleaner that is making it run better without it? Seems to restrictive.
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Old 05-10-2013, 10:53 PM
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Quote:
Originally Posted by 33Willys77 View Post
I think the carb may be getting too warm and in doing so, when you shut it off, the extra heat coming up from the motor can 'push' some fuel into the intake - just like Landshark has posted. What do you have for an aircleaner that is making it run better without it? Seems to restrictive.
it's the edelbrock elite series cleaner, i have a 14x3 spectre filter on there

hell i'm just gonna run without it
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Old 05-11-2013, 05:07 AM
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If the spacer is aluminum try using a phenolic one and see if that helps.

A heat shield under the carb can help to.
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Old 05-11-2013, 10:34 PM
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Quote:
Originally Posted by TommyK View Post
If the spacer is aluminum try using a phenolic one and see if that helps.

A heat shield under the carb can help to.
Ditto.

BB
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Old 05-12-2013, 01:15 AM
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I know squat of carbs but hows the spark?
Is it de tuning itself during operation?
Is the tune itself good enough...with you still having what seems to be restriction issues with air...still.

Any popping backfiring or smoke at all
Does it smell rich while running
Like I said I dont know carbs so are they tune specific by what theyre made of ...how theyre designed and have tuning rules per say with other components. Would edelbrock have this info to help with tuning.
Im not trying to get in the way with not knowing exactly just trying to help.
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