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Old 11-07-2010, 07:27 AM
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Holley 600 on 350 chev wont start once engine is hot, help

hey guys, just bought myself a ski boat. It has a mildly worked 350 chev fitted with a near new 600 holley carb.
My problem is after running the boat for a while and i suddenly stop it; after a minute or so later I go to start it again and it wont fire.
I can give it no gas or some gas (have tried both a few times) and it wont start, i have to wait nearly 10 mintues and then try again and it will finally start.
Anyone have any ideas what is wrong and how to fix it?
My guess was the heat was evaperatingthe fuel in the bowl but im really not sure, im new to holley carbs.

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Old 11-07-2010, 07:43 AM
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What kind of ignition/distributor does it have?
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Old 11-07-2010, 07:53 AM
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haha um at the moment i dont know exactly i will find out (have only had the boat a few days) , i do know it is an electric dizzy, not a points one.
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Old 11-07-2010, 08:05 AM
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If it is an HEI with a coil in cap, it is possible that it is a heat-related ignition failure...

Does it start up when cold without problems?
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Old 11-07-2010, 12:12 PM
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My quadrajet had a bad gasket and would leak extra fuel into the engine while running, then when i tried to start it it wouldn't fire. Check to make sure this isn't happening. Also if you are running an electric pump the pressure may be too high, or the carb jetted too rich.
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Old 11-07-2010, 05:21 PM
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If its a HEI dizzy. the modules go bad in them and fail when they wear out. Its on the top of the distributor base under the rotor. Its either that or the coil in the cap.

one of these times when its stops it wont even work when it cools off.
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Old 11-07-2010, 07:08 PM
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It seens to be a hot start problen so I would ask you,
Does the carb set right on the manifold? I had the same problem with my 305 right after I did the build to it. YES a 305. I ended up getting a Holley carburetor heat shield and never looked back, it took care of the hot no start.
Here is the part number: Holley 108-70 Carburetor Heat Shield. You can find it anywere.And for 35-40 dollars it cant hurt because a boat engine spins at a higher RPM for longer than any street engine and as such gets hotter. But in the short term you could always see if the dizzy is still working when it wont start but I just dont think it is that based on what you said.
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Old 11-07-2010, 07:58 PM
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dude its vapor lock get a carb spacer
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Old 11-08-2010, 12:10 AM
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Thanks for that kd5icr, I'll give that a go it seems the most likely. As I have checked to see if fuel is going through while it won't start and it is so I don't think it is a vapor lock issue.
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Old 11-08-2010, 01:20 AM
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my first question would be.. define 'doesn't start'

does it turn over? If it does, does it labor? or does it just crank and crank and crank and show no signs of wanting to start?
does it cough and spit but just won't catch?

if it makes no effort to even try to catch, I'd suspect ignition.. if it coughs and spits but just won't fire, I'd suspect fuel.


being an inboard engine, you could be suffering from vapor lock from heat soak..

I used to have a similar problem on my car until I moved the fuel line further away from the exhaust.
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Old 11-08-2010, 01:21 AM
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Quote:
Originally Posted by Onefunponcho
If its a HEI dizzy. the modules go bad in them and fail when they wear out. Its on the top of the distributor base under the rotor. Its either that or the coil in the cap.

one of these times when its stops it wont even work when it cools off.
Been there.. Done that!!! Bought the T-shirt!!
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Old 11-08-2010, 04:09 AM
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Quote:
Originally Posted by kc8oye
my first question would be.. define 'doesn't start'

does it turn over? If it does, does it labor? or does it just crank and crank and crank and show no signs of wanting to start?
does it cough and spit but just won't catch?

if it makes no effort to even try to catch, I'd suspect ignition.. if it coughs and spits but just won't fire, I'd suspect fuel.


being an inboard engine, you could be suffering from vapor lock from heat soak..

I used to have a similar problem on my car until I moved the fuel line further away from the exhaust.

kc8oye, yes it winds over very well, has a good large battery.
it doesnt sound like it will fire at all, untill left for a good ten minutes with the cover open, after that it will wind over and start after about 10 seconds.
it will then run perfect for the rest of the day just like it did before i stopped it.
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Old 11-08-2010, 07:14 AM
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Quote:
Originally Posted by gilflite350
Thanks for that kd5icr, I'll give that a go it seems the most likely. As I have checked to see if fuel is going through while it won't start and it is so I don't think it is a vapor lock issue.
Also because you just got it, it would be a good idea to go ahead and do a full tune up and oil change anyway. including the module. These are things that not all people do before they sell stuff let alone on a regu;ar scedule.
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Old 11-08-2010, 12:45 PM
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Quote:
Originally Posted by gilflite350
kc8oye, yes it winds over very well, has a good large battery.
it doesnt sound like it will fire at all, untill left for a good ten minutes with the cover open, after that it will wind over and start after about 10 seconds.
it will then run perfect for the rest of the day just like it did before i stopped it.
I would start by checking for spark when it doesn't want to start. There are tools for this.. if not.. remove a plug wire, put a screwdriver in the end of it and position the screwdriver so that it has about 1/8" gap to something grounded.

usually even with vapor lock it will show some sign of attempting to start.
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Old 11-08-2010, 03:49 PM
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Originally Posted by kc8oye
Been there.. Done that!!! Bought the T-shirt!!
I wish I would have learned about this from a forum before it stranded me.....

I had to learn the hard way
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