Hard Starting after it gets warm
Thread Starter
Instructor
Joined: Feb 2012
Posts: 187
Likes: 1
From: Jacksonville-Area FL
Hard Starting after it gets warm
I have been having an issue strating the car after it gets warm. Starts right up in the morning, but after it gets warm and I turn it off and then restart its really hard to start, almost have to keep the pedal to the floor to get it going...
Timing and such is all great, done to specs from Lars. Thinking maybe vapor lock, no return hooked up... Once it starts runs fine...
Timing and such is all great, done to specs from Lars. Thinking maybe vapor lock, no return hooked up... Once it starts runs fine...
Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
I have been having an issue strating the car after it gets warm. Starts right up in the morning, but after it gets warm and I turn it off and then restart its really hard to start, almost have to keep the pedal to the floor to get it going...
Timing and such is all great, done to specs from Lars. Thinking maybe vapor lock, no return hooked up... Once it starts runs fine...
Timing and such is all great, done to specs from Lars. Thinking maybe vapor lock, no return hooked up... Once it starts runs fine...
- Turns over slow and groans?
- Turns over fast but doesn't fire?
Melting Slicks
Joined: Aug 2012
Posts: 2,548
Likes: 379
From: Woodinville WA
check your float level - most hot-starting, fuel related problem come from the carb flooding the motor when it's hot. typically, one of the best signs is it's starting a lot easier (because it's richening the motor more than normal).
Also, you can turn the motor off (when hot), look down the carb and see if fuel is continuing to drip into the motor from the booster venturi
Here's a circuit - no idea what is on your car, but they all, basically, are the same - they draw fuel from the bowl into the motor, as there's no check valve, pressurizing the tank will cause fuel to come out of these venturis (or having too high a float level, or a sunk float)
Also, you can turn the motor off (when hot), look down the carb and see if fuel is continuing to drip into the motor from the booster venturi
Here's a circuit - no idea what is on your car, but they all, basically, are the same - they draw fuel from the bowl into the motor, as there's no check valve, pressurizing the tank will cause fuel to come out of these venturis (or having too high a float level, or a sunk float)
Drifting
Joined: Dec 2004
Posts: 1,714
Likes: 42
From: Austin Texas
Try this too, next time you dive the car and get things warmed up, when you shut it down, pull the air cleaner and look down the carb. You are looking for fuel draining or dripping after the car is turned off.
The fuel gets hot, boils and drips out flooding the motor. (this would be if the starter spins fast/normal but no start.) If this happens, try holding down the throttle to clear the flood while you start.
Thread Starter
Instructor
Joined: Feb 2012
Posts: 187
Likes: 1
From: Jacksonville-Area FL
As I said.. pretty much have to keep the pedal to the floor.. like its not getting any fuel...sounds like what is mentioned below... but I dont see any fuel in the carb
Thread Starter
Instructor
Joined: Feb 2012
Posts: 187
Likes: 1
From: Jacksonville-Area FL
Try this too, next time you dive the car and get things warmed up, when you shut it down, pull the air cleaner and look down the carb. You are looking for fuel draining or dripping after the car is turned off.
The fuel gets hot, boils and drips out flooding the motor. (this would be if the starter spins fast/normal but no start.) If this happens, try holding down the throttle to clear the flood while you start.
Drifting
Joined: Dec 2004
Posts: 1,714
Likes: 42
From: Austin Texas
IF, the conditions are right you can sometimes actually hear fuel percolating in the bowl. Lowering the float level can help keep it from boiling over. That carb has external adjustments so you could experiment pretty easy. Also a heat insulator/shield may help.
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Racer
Joined: Jan 2008
Posts: 295
Likes: 58
From: Arvada Colorado
Hard starting after it warms up
You mentioned that your fuel line runs close to a heater line. The real issues is the heat from the intake manifold heating up your carb and perculating the fuel in the bowls. I race vintage and had this problem at one time. I run a little lower level of fuel in the bowls and have the extended vent but the solution to stop the boiling was insulating the carb from the manifold. However, try lowering the fuel level first to see if that works, as suggested by others.
Melting Slicks
Joined: Aug 2012
Posts: 2,548
Likes: 379
From: Woodinville WA
the fact it's a holley makes me believe in my original advice even more - and it's soooo easy to lower the float level on a holley - IIRC a 9/16 box end and a screw driver.
here's a youtube on how-to
http://www.youtube.com/watch?v=ge-mIk6nEYQ
Melting Slicks
Joined: Aug 2012
Posts: 2,548
Likes: 379
From: Woodinville WA
Also, if it is getting too hot, run a fuel pressure regulator off the back of the carb then back down the return fuel line. The least amount of time the fuel is in the line, the less chance you'll have for vapor lock/heat soak in the line.
Race Director
Joined: Oct 2000
Posts: 15,017
Likes: 79
From: central FL, near the beach.
hook up return and route lines away from heat. Use 4 hole heat isolater gasket carb base.
if it is still a problem a $3 fan and duct to cool air works for me 100%. i just switch it on when in doubt.
a carb appreciates a cool breeze!
if it is still a problem a $3 fan and duct to cool air works for me 100%. i just switch it on when in doubt.
a carb appreciates a cool breeze!
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,117
From: Crossville TN
You might also have an electrical problem in the starter system. If the main power feed wire and/or the frame-to-starter/engine ground cable are deteriorated or not making good contact, that could cause the same problem. Your starter solenoid could also be at fault. IMO, the only way the starter motor could cause such a problem is if the commutator brushes are worn out and making poor contact.
Thread Starter
Instructor
Joined: Feb 2012
Posts: 187
Likes: 1
From: Jacksonville-Area FL
I never gave the starter a thought.... There is no heat shield so that could be it espicaliy since I had the same issue with the edelbrok carb.
Battery is a red top and is only about a year old and cranks well...
Battery is a red top and is only about a year old and cranks well...