If it is gasoline that is too hot then adjusting the timing will not help. 2 attacks to this issue and might have to do both. First is to run a carb insulators to prevent boiling fuel. Best guess is 1/2 inch, that should not mess with hood clearance too much, but might depending on air cleaner. Other to try, if that was not enough then you might have to run a fuel return line. I have changed the fuel filter to a vapor line model that has a 1/4 inch return line back to tank. I have heard of using Holley jets inside the rubber line to restrict some of the flow back. I think I had heard that Chevrolet used .110 jet. For return line must solder metal tube in fuel sender. Good time to change other line to 3/8 if not already. The fuel return line setup helps more with vapor lock.
Warning: if you change the main feed line there might be a layer of water near the bottom of the tank that WILL give you running problems for about 30 seconds for every drop. One of those ask me how.....
I don't have fuel boiling issues. I have 2 x 2" carb spacers, I also have a return line from regulator to tank, I have a check valve located near the tank. my lines are all high temp
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Yep I use a restrictor too, 0.100 main to get 5.5psi at the needle with a mechanical pump putting out 7. Jet size depends on setup (rubber lines vs steel, pump pressure, total volume, etc). My carb likes 5-5.5. You can also use a return-type regulator to do the same thing. If you dont have a return line you can just use a regulator alone set to spec pressure. The goal is to keep the pressure high enough at the carb to not surge WOT, but low enough not to flood when cruising around or idling.
Also check float level. If the float setting is higher than spec you risk consistent loading up of the engine.
float level is fine, spark plugs a little rich, You guys could be here all day throwing suggestions I have been through it before, my setup is a very hard one to tune. I just need to know which way to go to better it as it will never be perfect unless I change some components
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If it is gasoline that is too hot then adjusting the timing will not help. 2 attacks to this issue and might have to do both. First is to run a carb insulators to prevent boiling fuel. Best guess is 1/2 inch, that should not mess with hood clearance too much, but might depending on air cleaner. Other to try, if that was not enough then you might have to run a fuel return line. I have changed the fuel filter to a vapor line model that has a 1/4 inch return line back to tank. I have heard of using Holley jets inside the rubber line to restrict some of the flow back. I think I had heard that Chevrolet used .110 jet. For return line must solder metal tube in fuel sender. Good time to change other line to 3/8 if not already. The fuel return line setup helps more with vapor lock.
Warning: if you change the main feed line there might be a layer of water near the bottom of the tank that WILL give you running problems for about 30 seconds for every drop. One of those ask me how.....
this is my fuel line setup.
* standard tank with vent line.
1/2" fuel line from tank to 1/2 check valve just above diff
1/2" line from valve to filter in engine bay
1/2" feul line from filter to clay smith mech pump
1/2" fuel line from pump to regulator
2 x -6an lines from regulator to carb
-4an line from racepumps regulator back to fuel filler neck at tank
all brand new, tank is brand new. I don't seem to have fuel issues
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THANKS SO FAR GUYS
