Hard start after hot soak, where to begin?

[keelhauled]

My 305 GM with 2bbl carb has started a new trick. It starts cold and runs beautiful; lots of power and never misses a beat. Idles perfect as well. However, after pulling a skier for a while I shut the engine down after about a 1-2 minute idle period to let the skier back into the boat. After that, it no longer wants to start. I have to wait about 15 minutes, then it starts right back up again.<br /><br />This has happened a few times and I've tried all throttle positions from not touching it at all to WOT and nothing seems to do the trick. <br /><br />I did a complete ignition system tune-up in May (and I do mean complete) and checked and rechecked to make sure everything, like timing, dwell, and plug gap is in spec. I replaced the fuel filter and seperator filter and my fuel flow is excellent. Spark is strong and blue/white. <br /><br />Where should I start? I haven't done a compression test and I know the motor is a little tired, but it runs so darn good and I'm not burning any oil.<br /><br />This just started out of the blue... any ideas?<br /><br />Thanks!<br />kh

 

[Trent]

Re: Hard start after hot soak, where to begin?

Sounds to me its vapor locking. Cool down the fuel lines. Wet them with water or ice and see if this helps? Run your blower or run it longer. If it does you might want to get some fuel line wrap to help your problem.

 

[bigbrownbuku]

Re: Hard start after hot soak, where to begin?

different types of gas will sometimes vapour lock<br />easier. high delivery vacuum will increase the liklihood also. start by replacing your filter and cleaning the screen at the carb fitting, then double check every connection for leaks. sometimes a fuel system will suck air but not leak gas.

 

[bolo789]

Re: Hard start after hot soak, where to begin?

hey i am having the same hard starting when hot every said to look in the carb to see if gas still dripping with the engine off, i thought i look good before did not see any dripping. today i realy have a close look and behold both inlets is drippind gas after shut down took the carb of and drop it off with the carb guy, i will let you guys know if i still have the hard start after run and shut down. good luck.