Warm starting issue

[Hagman]

I have a warm starting issue. The 351 will start easily cold. When it is a operating temp the motor can be turned off and restarted with just the touch of the key. But if it sets for more then 5 to 10 min. I will need to grind the starter for at least 5 seconds.
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[csuggs]

Sounds familiar - many have been having similar issues including myself. I'll be interested in seeing what everyone has to say.

[haugy]

Here's a scenario I'm also familiar with. I got mine fixed on the Mariah, now dealing with it on the Salt.

Here's a question. When you start it hot, does it help to pump the throttle? Mine does. I can turn and turn the key and it would take about 7-8 seconds before it starts and would run a little rough till I gave it some gas to flush out the carb. But if I start it, and give it a lot of gas, it fires up and runs fine. This would lead me to believe my fuel is boiling or evaporating out of the carb overflow vents over time.

I think my carb floats need to be adjusted up a bit to allow the engine to run a tad bit more rich. This should provide more fuel to the intake upon starting to allow it to fire up. My Mariah would always start on the first turnover, but she also had the slightest rich smell.

I can't see the problem being anything electrical as long as your points and plugs are good.

Anyone else with other ideas? Since Csuggs won't chime in with his.

[kvand347]

I agree with Haugy's theory. Mine runs very similar. Pump the gas twice after sitting for awhile and she starts up. No pumps and she will just turn and turn. Haugy if you adjust your float and it fixes your problem, please let us know!

[Salty87]

never hurts to clean/tighten battery connections & block ground. cables original?

[haugy]

Salty, on my end (don't know about the OP's) but it's not electrical. My starter, cables, plugs, wires, etc are all new. And you can tell when you hit the starter on my boat, it hits and turns like there is no compression, no resistance.

That's why I'm going to try and address the fuel issue. I'll keep ya posted KV

[DAFF]

5-10min rest always would double pump by instint, including my older trucks. I think it is just a carb thing combined with evaporation. Double pump activates the accelerator pump and gives 2 fresh squirts of fuel. Tap the key anf vrum.

[CornRickey]

After a couple minutes of sitting, take a look at the venturis. See if there dripping. Also try touching a 12vlt source to your coil while cranking, bypassing the resistor (if you have one) If that helps then you have a heat/resistance issue in your harness or your starter might be going south and drawing more amps than when cold.

[OUI]

Make sure your timing is correct. If it's too far advanced it will have a hard time starting when it's warm/hot.

[haugy]

Make sure your timing is correct. If it's too far advanced it will have a hard time starting when it's warm/hot.

Interesting, I haven't checked my timing this year. I shall do that and come back with results.